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Books > Professional & Technical > Transport technology

China's High-Speed Rail Technology - An International Perspective (Hardcover, 1st ed. 2018): Youtong Fang, Yuehong (Helen)... China's High-Speed Rail Technology - An International Perspective (Hardcover, 1st ed. 2018)
Youtong Fang, Yuehong (Helen) Zhang
R4,857 Discovery Miles 48 570 Ships in 18 - 22 working days

This book presents cutting-edge theories, techniques, and methodologies in the multidisciplinary field of high-speed railways, sharing the revealing insights of elite scholars from China, the UK and Japan. It demonstrates the achievements that have been made regarding high-speed rail technologies in China from all aspects, while also providing a macro-level comparative study of related technologies in different countries. The book offers a valuable resource for researchers, engineers, industrial practitioners, graduate students, and professionals in the fields of Vehicles, Traction Power Supplies, Materials, and Infrastructure.

Automotive Computer Controlled Systems (Paperback): Allan Bonnick Automotive Computer Controlled Systems (Paperback)
Allan Bonnick
R1,810 Discovery Miles 18 100 Ships in 10 - 15 working days

'Automotive Computer Controlled Systems' explains the fundamental principles of engineering that lie behind the operation of vehicle electronic systems. Having obtained this knowledge, the reader will be able to make full use of the diagnostic equipment which is currently available. The book builds on the concepts contained in Vehicle Electronic Systems and Fault Diagnosis and gives clear steps to fault diagnosis and subsequent repair of the vehicle's electronic systems. The author discusses electronics only within the context of the vehicle systems under consideration, and thus keeps theory to a minimum.

Allan Bonnick has written articles for several transport/vehicle journals and carries out consultancy work for the Institute of Road Transport Engineers. In addition, he has had many years teaching experience and is ideally placed to write this informative guide.
* Principles discussed in context avoiding unnecessary theory and maths
* Practical step-by-step instructions on fault diagnosis and repair
* Liberally illustrated with clear diagrams

Air Transport System Analysis and Modelling (Hardcover): Milan Janic Air Transport System Analysis and Modelling (Hardcover)
Milan Janic
R5,497 Discovery Miles 54 970 Ships in 10 - 15 working days

Presenting a comprehensive coverage, Air Transport System Analysis and Modelling is a unique text dealing with the analysis and modelling of the processes and operations carried out in all three parts of the air transport system, namely, airports, air traffic control and airlines.

Seen from a planners point of view, this book provides insights into current methods and also gives details of new research. Methods are given for the analysis and modelling of the capacity, quality and economics of the service offered to users and includes illustrative analytical and simulation models of the systems operations supported by an appropriate analysis of real world events and applications. Undergraduates and graduates in the field of air transport planning and technology, applied operations research and applied transport economics will find this book to be of interest, as will specialists involved with transport institutes and consulting firms, policy makers dealing with air transport and the analysts and planners employed at air transport enterprises.

Computational Optimization of Internal Combustion Engines (Hardcover, Edition.): Yu Shi, Hai-Wen Ge, Rolf D. Reitz Computational Optimization of Internal Combustion Engines (Hardcover, Edition.)
Yu Shi, Hai-Wen Ge, Rolf D. Reitz
R4,049 Discovery Miles 40 490 Ships in 18 - 22 working days

Computational Optimization of Internal Combustion Engines presents the state of the art of computational models and optimization methods for internal combustion engine development using multi-dimensional computational fluid dynamics (CFD) tools and genetic algorithms. Strategies to reduce computational cost and mesh dependency are discussed, as well as regression analysis methods. Several case studies are presented in a section devoted to applications, including assessments of: spark-ignition engines, dual-fuel engines, heavy duty and light duty diesel engines. Through regression analysis, optimization results are used to explain complex interactions between engine design parameters, such as nozzle design, injection timing, swirl, exhaust gas recirculation, bore size, and piston bowl shape. Computational Optimization of Internal Combustion Engines demonstrates that the current multi-dimensional CFD tools are mature enough for practical development of internal combustion engines. It is written for researchers and designers in mechanical engineering and the automotive industry.

Command Companion of Seamanship Techniques (Paperback): David House Command Companion of Seamanship Techniques (Paperback)
David House
R1,808 Discovery Miles 18 080 Ships in 10 - 15 working days

The Command Companion of Seamanship Techniques is the latest work from the well-respected marine author, D J House. It contains all the information needed for command posts at sea.
- All aspects of shipboard management are discussed, with special emphasis placed on health and safety.
- Guidelines on how to respond to accidents and emergencies at sea
- Contains the most recent SOLAS revisions and a discussion of marine law to keep you up to date with the latest rules and regulations.
In order to aid learning, the book includes a number of worked examples in the text along with questions and answers at the end of chapters.

The author tells you how to respond to accidents and emergencies at sea, in the event, for example of cargo contamination, collision, loss of stability due to cargo shift and damage due to flooding, fire plus loss of life/crew. In addition, the SOLAS revisions and a discussion of marine law is included to keep you up to date with all the latest rules and regulations.
In order to aid learning, this book will include a number of worked examples in the text along with questions and answers at the end of chapters.
D J House is senior lecturer in Nautical studies at the Nautical college, Fleetwood. His sea-going experience includes general cargo, reefer, bulk cargo, passenger and liner trades, underwater operations, and roll-on/roll-off ferries. He is a well-known marine author and has written Seamanship Techniques Volumes 1 and 2 (combined) and he has revised Cargo Work in the Kemp & Young series.
All aspects of shipboard management are discussed, with special emphasis placed on health and safety.
Guidelines on how to respond to accidents andemergencies at sea
Contains the most recent SOLAS revisions and a discussion of marine law to keep you up to date with the latest rules and regulations.

Proceedings of the Symposium of Aeronautical and Aerospace Processes, Materials and Industrial Applications - Presented at the... Proceedings of the Symposium of Aeronautical and Aerospace Processes, Materials and Industrial Applications - Presented at the XXV International Materials Research Congress - Cancun 2016 (Hardcover, 1st ed. 2018)
P. Zambrano-Robledo, A. Salinas-Rodriguez, F. Almeraya Calderon
R5,665 R4,533 Discovery Miles 45 330 Save R1,132 (20%) Ships in 10 - 15 working days

This book presents selected contributions to the Symposium of Aeronautical and Aerospace Processes, Materials and Industrial Applications of the XXV International Materials Research Congress (IMRC). Each chapter addresses scientific principles behind processing and production of materials for aerospace/aeronautical applications. The chapter deals with microstructural characterization including composites materials and metals. The second chapter deals with corrosion in aerospace components is a large and expensive problema for aerospace industry. Finally, the last chapter covers modeling and simulation of different processes to evaluate and optimize the forming process. This book is meant to be useful to academics and professionals.

Computational Aerosciences in the 21st Century - Proceedings of the ICASE/LaRC/NSF/ARO Workshop, conducted by the Institute for... Computational Aerosciences in the 21st Century - Proceedings of the ICASE/LaRC/NSF/ARO Workshop, conducted by the Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, The National Science Foundation and the Army Research Office, April 22-24, 1998 (Hardcover, 2000 ed.)
Manuel D. Salas, W. Kyle Anderson
R2,813 Discovery Miles 28 130 Ships in 18 - 22 working days

Over the last decade, the role of computational simulations in all aspects of aerospace design has steadily increased. However, despite the many advances, the time required for computations is far too long. This book examines new ideas and methodologies that may, in the next twenty years, revolutionize scientific computing. The book specifically looks at trends in algorithm research, human computer interface, network-based computing, surface modeling and grid generation and computer hardware and architecture. The book provides a good overview of the current state-of-the-art and provides guidelines for future research directions. The book is intended for computational scientists active in the field and program managers making strategic research decisions.

Global Automobile Demand - Major Trends in Mature Economies; Volume 1 (Hardcover): Bruno Jetin Global Automobile Demand - Major Trends in Mature Economies; Volume 1 (Hardcover)
Bruno Jetin
R3,267 Discovery Miles 32 670 Ships in 10 - 15 working days

Global Automobile Demand is a two-volume work analysing the impact of the Great Recession and the structural factors which shape automobile demand in developed and emerging countries. The first volume of Global Automobile Demand examines the automobile demand in mature economies: the USA, the UK, France, Germany, Spain, Japan and Korea.

Missile Guidance and Control Systems (Hardcover, 2004 ed.): George M. Siouris Missile Guidance and Control Systems (Hardcover, 2004 ed.)
George M. Siouris
R9,938 Discovery Miles 99 380 Ships in 10 - 15 working days

Airborne Vehicle Guidance and Control Systems is a broad and wide- angled engineering and technological area for research, and continues to be important not only in military defense systems but also in industrial process control and in commercial transportation networks such as various Global Positioning Systems (GPS). The book fills a long-standing gap in the literature. The author is retired from the Air Force Institute and received the Air Force's Outstanding Civilian Career Service Award.

Handbook of Vehicle-Road Interaction (Hardcover): David Cebon Handbook of Vehicle-Road Interaction (Hardcover)
David Cebon
R7,090 Discovery Miles 70 900 Ships in 10 - 15 working days

This handbook dicussess tyre-road contact forces generated by heavy vehicles covering their influence on road surface and bridge response and damage, as well as ways of regulating and improving vehicles so as to minimize road damage.;The main incentive for understanding vehicle-road interaction is the possibility of reducing the road damage caused by heavy vehicles and the very high associated costs. This may be achieved by highway authorities, through improved design and construction of roads; by government agencies, through regulations intended to encourage the use of more "road-friendly" vehicles; or by vehicle engineers, through design of improved vehicle configurations and suspensions, which minimize road damage.;The book provides a unified mechanistic approach to the entire subject, covering vehicle dynamics; dynamic tyre forces; weigh-in-motion; pavement and bridge response; damage mechanisms of paving materials; vehicle-guideway interaction; suspension design to minimize road damage; and assessing road damaging potential of vehicles for regulatory purposes. It includes 25 literature reviews, covering topics from asphalt deformation to weigh-in-motion, and citing over 500 references. In addition, it discusses both the fundamental mechanics of the mechanical and civil engineering systems, as well as practical and implementation issues.

Human Performance in General Aviation (Hardcover, New Ed): David O'Hare Human Performance in General Aviation (Hardcover, New Ed)
David O'Hare
R3,385 Discovery Miles 33 850 Ships in 10 - 15 working days

This is the first available edited collection of chapters on human performance in general aviation. Each chapter has been written by someone with knowledge of both the research literature and the operational background of general aviation. Chapters are designed to survey the current state of knowledge in areas critical to general aviation and to spell out both the operational implications of this knowledge and the directions needed for future research. Topics covered include strategies for flight instruction; the development of computer-based training; stress and decision making; skill development; the involvement of general aviation pilots in incidents and accidents; human factors implications of GPS use and the future of aircraft design and development in general aviation. The book provides an authoritative outline of currently applicable human factors knowledge for general aviation and a valuable guide to future developments. It features a foreword by Dr Stan Roscoe.

Vehicular Technology Handbook: Volume I (Hardcover): MacKenzie Ruiz Vehicular Technology Handbook: Volume I (Hardcover)
MacKenzie Ruiz
R3,163 R2,865 Discovery Miles 28 650 Save R298 (9%) Ships in 18 - 22 working days
Air Traffic Control: Human Performance Factors (Hardcover, New Ed): Anne R. Isaac, Bert Ruitenberg Air Traffic Control: Human Performance Factors (Hardcover, New Ed)
Anne R. Isaac, Bert Ruitenberg
R4,943 Discovery Miles 49 430 Ships in 10 - 15 working days

From the Foreword by Captain Daniel Maurino, ICAO: '...Air Traffic Control...will remain a technology-intensive system. People (controllers) must harmoniously interact with technology to contribute to achieve the aviation system's goals of safe and efficient transportation of passengers and cargo...This book...considers human error and human factors from a contemporary and operational perspective and discusses the parts as well as the whole...I hope you enjoy reading it as much as I did.' The motivation for writing this book comes from the author's long standing belief that the needs of Air Traffic Service personnel are inadequately represented in the aviation literature. There are few references to air traffic control in many of the books written for pilots and about pilots and this is also observed at the main international conferences. In line with the ICAO syllabus for human factors training for air traffic controllers, the book covers the main issues in air traffic control, with regard to human performance: physiology including stress, fatigue and shift work problems; psychology with emphasis on human error and its management, social psychology including issues of communication and working in teams, the environment including ergonomic principles and working with new technologies and hardware and software issues including the development of documentation and procedures and a study of the changes brought about by advanced technologies. Throughout the text there are actual examples taken from the air traffic control environment to illustrate the issues discussed. A full bibliography is included for those who want to read beyond these issues. It has been written for all in air traffic services, from ab initio to the boardroom; it is important that the men and women in senior management positions have some knowledge and awareness of the fundamental problems that limit and enhance human performance.

Sliding Mode Control of Vehicle Dynamics (Hardcover): Antonella Ferrara Sliding Mode Control of Vehicle Dynamics (Hardcover)
Antonella Ferrara
R3,633 R3,272 Discovery Miles 32 720 Save R361 (10%) Ships in 18 - 22 working days

The control of the longitudinal, lateral and vertical dynamics of two and four-wheeled vehicles, both of conventional type as well as fully-electric, is important not only for general safety of vehicular traffic in general, but also for future automated driving. Sliding Mode Control of Vehicular Dynamics provides an overview of this important topic. Topics covered include an introduction to sliding mode control; longitudinal vehicle dynamics control via sliding modes generation; sliding mode control of traction and braking in two-wheeled vehicles; lateral vehicle dynamics control via sliding modes generation; stability control of heavy vehicles; sliding mode approach in semi-active suspension control; and observer-based parameter identification for vehicle dynamics assessment. Each chapter introduces the problem formulation and a general overview of its physical aspects, provides a survey of the relevant literature on the topic, and reports on the authors' contributions to solving the control problem. The book is essential reading for researchers involved in vehicle control, from both industry and academia, as well as advanced students.

Developing the Future Aviation System (Hardcover, New Ed): Rod Baldwin Developing the Future Aviation System (Hardcover, New Ed)
Rod Baldwin
R3,367 Discovery Miles 33 670 Ships in 10 - 15 working days

The major changes taking place in technology have some of the greatest effect in the world of aviation. Yet, in an industry which started with the concept of 'open skies', each sector has traditionally developed on its own and adjusted to developments in other areas as and when required. The need for integration is particularly important as the skies become increasingly crowded. More intense commercialization dramatically increases the interlocking between technological developments and the size of the financial investments required. For maximum efficiency the aviation system thus has to develop as an integrated whole with a greater awareness of events in other sectors. This book is intended to meet this requirement by addressing the breadth and depth of the aviation system and looking at some areas where significant advances are happening. While following the processes of development, the reader will see where the results might lead in the new century. Its three parts concentrate on areas of great significance - in integration as well as in technological progress - especially for their impact on human and social aspects. The editor and the invited contributors are amongst the foremost experts, researchers and industry leaders in their fields in the global aviation community, many with hands-on experience of massive change. The intended readership includes those who are moving into management functions in air traffic management, airplane manufacturing and airline operations; in training centres, colleges and institutions.

Fundamentals of Fluid Mechanics - For Scientists and Engineers (Hardcover, 1st ed. 2022): Patrick Chassaing Fundamentals of Fluid Mechanics - For Scientists and Engineers (Hardcover, 1st ed. 2022)
Patrick Chassaing
R3,390 Discovery Miles 33 900 Ships in 18 - 22 working days

This textbook provides a coherent and structured overview of fluid mechanics, a discipline concerned with many natural phenomena and at the very heart of the most diversified industrial applications and human activities. The balance between phenomenological analysis, physical conceptualization and mathematical formulation serve both as a unifying educational marker and as a methodological guide to the three parts of the work. The thermo-mechanical motion equations of a homogeneous single-phase fluid are established, from which flow models (perfect fluid, viscous) and motion classes (isovolume, barotropic, irrotational, etc.) are derived. Incompressible, potential flows and compressible flows, both in an isentropic evolution and shock, of an ideal inviscid fluid are addressed in the second part. The viscous fluid is the subject of the last one, with the creeping motion regime and the laminar, dynamic and thermal boundary layer. Historical perspectives are included whenever they enrich the understanding of modern concepts. Many examples, chosen for their pedagogical relevance, are dealt with in exercises. The book is intended as a teaching tool for undergraduate students, wishing to acquire a first command of fluid mechanics, as well as graduates in advanced courses and engineers in other fields, concerned with completing what is sometimes a scattered body of knowledge.

The Manchester Benchmarks for Rail Vehicle Simulation (Hardcover): S. Iwnicki The Manchester Benchmarks for Rail Vehicle Simulation (Hardcover)
S. Iwnicki
R5,767 Discovery Miles 57 670 Ships in 10 - 15 working days

This volume contains the results of the Manchester Benchmarking exercise for railway vehicle dynamics simulation packages. Five of the main computer packages currently used for this purpose were examined in the exercise and the results are presented in the form of tables and graphs.

General Aviation Aircraft Design - Applied Methods and Procedures (Hardcover, 2nd edition): Snorri Gudmundsson General Aviation Aircraft Design - Applied Methods and Procedures (Hardcover, 2nd edition)
Snorri Gudmundsson
R3,728 Discovery Miles 37 280 Ships in 10 - 15 working days

General Aviation Aircraft Design, Second Edition, continues to be the engineer's best source for answers to realistic aircraft design questions. The book has been expanded to provide design guidance for additional classes of aircraft, including seaplanes, biplanes, UAS, high-speed business jets, and electric airplanes. In addition to conventional powerplants, design guidance for battery systems, electric motors, and complete electric powertrains is offered. The second edition contains new chapters: Thrust Modeling for Gas Turbines Longitudinal Stability and Control Lateral and Directional Stability and Control These new chapters offer multiple practical methods to simplify the estimation of stability derivatives and introduce hinge moments and basic control system design. Furthermore, all chapters have been reorganized and feature updated material with additional analysis methods. This edition also provides an introduction to design optimization using a wing optimization as an example for the beginner. Written by an engineer with more than 25 years of design experience, professional engineers, aircraft designers, aerodynamicists, structural analysts, performance analysts, researchers, and aerospace engineering students will value the book as the classic go-to for aircraft design.

Warships (Paperback): Iain Mackenzie Warships (Paperback)
Iain Mackenzie 2
R43 Discovery Miles 430 Ships in 10 - 15 working days
Crashworthiness of Composite Thin-Walled Structures (Hardcover): D.E. Manolakos, G.A. Demosthenous, M. B. Ioannidis, A.G.... Crashworthiness of Composite Thin-Walled Structures (Hardcover)
D.E. Manolakos, G.A. Demosthenous, M. B. Ioannidis, A.G. Mamalis
R8,736 Discovery Miles 87 360 Ships in 10 - 15 working days

FROM THE INTRODUCTION
Vehicle crashworthiness has been improving in recent years with attention mainly directed towards reducing the impact of the crash on the passengers. Effort has been spent in experimental research and in establishing safe theoretical design criteria on the mechanics of crumpling, providing to the engineers the ability to design vehicle structures so that the maximum amount of energy will dissipate while the material surrounding the passenger compartment is deformed, thus protecting the people inside.
During the last decade the attention given to crashworthiness and crash energy management has been centered on composite structures. The main advantages of fibre reinforced composite materials over more conventional isotropic materials, are the very high specific strengths and specific stiffness which can be achieved. Moreover, with composites, the designer can vary the type of fibre, matrix and fibre orientation to produce composites with proved material properties. Besides the perspective of reduced weight, design flexibility and low fabrication costs, composite materials offer a considerable potential for lightweight energy absorbing structures; these facts attract the attention of the automotive and aircraft industry owing to the increased use of composite materials in various applications, such as frame rails used in the apron construction of a car body and the subfloor of an aircraft, replacing the conventional materials used.
Our monograph is intended to provide an introduction to this relatively new topic of structural crashworthiness for professional engineers. It will introduce them to terms and concepts of it and acquaint them with some sources of literature about it. We believe that our survey constitutes a reasonably well-balanced synopsis of the topic.

Stages to Saturn - A Technological History of the Apollo/Saturn Launch Vehicles (Hardcover): Roger E. Bilstein Stages to Saturn - A Technological History of the Apollo/Saturn Launch Vehicles (Hardcover)
Roger E. Bilstein
R1,275 Discovery Miles 12 750 Ships in 18 - 22 working days
Aviation Safety, Human Factors - System Engineering - Flight Operations - Economics - Strategies - Management (Hardcover):... Aviation Safety, Human Factors - System Engineering - Flight Operations - Economics - Strategies - Management (Hardcover)
Soekkha
R11,190 Discovery Miles 111 900 Ships in 10 - 15 working days

Questions concerning safety in aviation attract a great deal of attention, due to the growth in this industry and the number of fatal accidents in recent years. The aerospace industry has always been deeply concerned with the permanent prevention of accidents and the conscientious safeguarding of all imaginable critical factors surrounding the organization of processes in aeronautical technology. However, the developments in aircraft technology and control systems require further improvements to meet future safety demands.
This book embodies the proceedings of the 1997 International Aviation Safety Conference, and contains 60 talks by internationally recognized experts on various aspects of aviation safety. Subjects covered include:
Human interfaces and man-machine interactions; Flight safety engineering and operational control systems; Aircraft development and integrated safety designs; Safety strategies relating to risk insurance and economics; Corporate aspects and safety management factors --- including airlines services and airport security environment.

Ship Construction Sketches and Notes (Paperback, 2nd edition): John F. Kemp, Peter Young Ship Construction Sketches and Notes (Paperback, 2nd edition)
John F. Kemp, Peter Young; Edited by D.J. Eyres
R2,128 Discovery Miles 21 280 Ships in 10 - 15 working days

This classic book in the Kemp and Young series has been fully revised and updated by David J Eyres, author of the well-known Butterworth-Heinemann title "Ship Construction," and will prove indispensable to the student reader. The contents cover, in numerous fully illustrated items, shipyard practices, principles of construction methods, the design and construction of the various component parts of the ship, and the overall arrangement of different types of merchant and passenger vessels.

Smart Intelligent Aircraft Structures (SARISTU) - Proceedings of the Final Project Conference (Hardcover, 1st ed. 2015):... Smart Intelligent Aircraft Structures (SARISTU) - Proceedings of the Final Project Conference (Hardcover, 1st ed. 2015)
Piet-Christof Woelcken, Michael Papadopoulos
R7,870 Discovery Miles 78 700 Ships in 18 - 22 working days

The book includes the research papers presented in the final conference of the EU funded SARISTU (Smart Intelligent Aircraft Structures) project, held at Moscow, Russia between 19-21 of May 2015. The SARISTU project, which was launched in September 2011, developed and tested a variety of individual applications as well as their combinations. With a strong focus on actual physical integration and subsequent material and structural testing, SARISTU has been responsible for important progress on the route to industrialization of structure integrated functionalities such as Conformal Morphing, Structural Health Monitoring and Nanocomposites. The gap- and edge-free deformation of aerodynamic surfaces known as conformal morphing has gained previously unrealized capabilities such as inherent de-icing, erosion protection and lightning strike protection, while at the same time the technological risk has been greatly reduced. Individual structural health monitoring techniques can now be applied at the part-manufacturing level rather than via extending an aircraft's time in the final assembly line. And nanocomposites no longer lose their improved properties when trying to upscale from neat resin testing to full laminate testing at element level. As such, this book familiarizes the reader with the most significant develo pments, achievements and key technological steps which have been made possible through the four-year long cooperation of 64 leading entities from 16 different countries with the financial support of the European Commission.

The THEMIS Mission (Hardcover, 2009 ed.): James L. Burch, Vassilis Angelopoulos The THEMIS Mission (Hardcover, 2009 ed.)
James L. Burch, Vassilis Angelopoulos
R4,109 Discovery Miles 41 090 Ships in 18 - 22 working days

J.L. Burch*V. Angelopoulos Originally published in the journal Space Science Reviews, Volume 141, Nos 1-4, 1-3. DOI: 10.1007/s11214-008-9474-5 (c) Springer Science+Business Media B.V. 2008 The Earth, like all the other planets, is continuously bombarded by the solar wind, which is variable on many time scales owing to its connection to the activity of the Sun. But the Earth is unique among planets because its atmosphere, magnetic eld, and rotation rates are each signi cant, though not dominant, players in the formation of its magnetosphere and its reaction to solar-wind inputs. An intriguing fact is that no matter what the time scale of solar-wind variations, the Earth's response has a de nite pattern lasting a few hours. Known as a magnetospheric substorm, the response involves a build-up, a crash, and a recovery. The build-up (known as the growth phase) occurs because of an interlinking of the geom- netic eld and the solar-wind magnetic eld known as magnetic reconnection, which leads to storage of increasing amounts of magnetic energy and stress in the tail of the mag- tosphere and lasts about a half hour. The crash (known as the expansion phase) occurs when the increased magnetic energy and stresses are impulsively relieved, the current system that supports the stretched out magnetic tail is diverted into the ionosphere, and bright, dynamic displays of the aurora appear in the upper atmosphere. The expansion and subsequent rec- ery phases result from a second magnetic reconnection event that decouples the solar-wind and geomagnetic elds.

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