This book constitutes the proceedings of the 39th IFIP WG 6.1 International Conference on Formal Techniques for Distributed Objects, Components, and Systems, FORTE 2019, held in Copenhagen, Denmark, in June 2019, as part of the 14th International Federated Conference on Distributed Computing Techniques, DisCoTec 2019. The 15 full and 3 short papers presented were carefully reviewed and selected from 42 submissions. The conference is dedicated to fundamental research on theory, models, tools, and applications for distributed systems.

There is the conjuncture that 2012 is a special year in the history of physics, that cannot go unobserved without celebration: 100 years of cosmic ray discovery, the 75th anniversary of Muon discovery and 70 years of the discovery of relativistic solar particles (Ground Level Enhancements). Several symposiums have been held in this regard, among which can be mentioned is that of the one held in Pollau, Austria in May 2012. There is need of a book that pays homage to these historical discoveries. The aim of this book is to collect some typical papers written for researchers of the international cosmic ray community that many scientists and students would like to have in their libraries. The main market for this book are universities and research institutes throughout the world, and mainly in countries where there is an old tradition in cosmic ray research: Europe, USA, Mexico, Canada, East Europe (mainly Russia), Japan, Australia, China, etc. It should also be of interest in scientific societies, professional organisations, or other groups relevant to the several fields of particle physics: eg: The Victor F Hess Society and the European Physical Society/History of Physics Group (EPS/HoP), COSPAR, IUGG, American Geophysical Union, Union Geofisica Mexicana, and others.

There is the conjuncture that 2012 is a special year in the history of physics that cannot go unobserved without celebration: 100 years of cosmic ray discovery, the 75th anniversary of Muon discovery and 70 years of the discovery of relativistic solar particles (Ground Level Enhancements). Several symposiums have been held in this regard, among which can be mentioned is that of the one held in Pollau, Austria in May 2012. There is need of a book that pays homage to these historical discoveries. The aim of this book is to collect some typical papers written for researchers of the international cosmic ray community that many scientists and students would like to have in their libraries. The main market for this book are universities and research institutes throughout the world, and mainly in countries where there is an old tradition in cosmic ray research: Europe, USA, Mexico, Canada, East Europe (mainly Russia), Japan, Australia, China, etc. It should also be of interest in scientific societies, professional organizations, or other groups relevant to the several fields of particle physics: e.g. The Victor F. Hess Society and the European Physical Society/History of Physics Group (EPS/HoP), COSPAR, IUGG, American Geophysical Union, Union Geofisica Mexicana, and others.