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The book reviews the knowledge obtained from ground-based and
space-borne solar flare research thus at the same time preparing
for the forthcoming mission of the satellite Solar A which will be
launched in 1991. Accordinglyone section is devoted to experiments
on Solar A. The rest review both theory and observational facts to
give a physically realistic picture of flares, including problems
of magnetic flux emergence, high energy particles in flares,
heating and flows in flares, and further problems of solar
activity.
These Proceedings result from the papers and discussions of the
U.S.-Japan Seminar "Recent Advances in the Understanding of Solar
Flares" held in Tokyo October 5-8, 1982. The meeting was sponsored
jointly by the Japan Society for the Promotion of Science and the
u.S. National Science Foundation. The principal aim of the meeting
was to obtain the most up-to-date physical picture of solar flares
by bringing together results from the recent observations by the
Solar Maximum Mission (SMM) and HINOTORI satellites, together with
other satellite data and ground-based data at both optical and
radio wavelengths. These data cover the recent maximum of the solar
activity cycle. The SMM and HINOTORI introduced a new dimension in
flare observations by carrying out the first hard X-ray imaging
observations, and the organizers especially felt that an intense
discussion of the significance of these results in the context of
flare theories would be important. Starting with an introductory
presentation of the characteristics of the instruments on board the
satellites, the sessions of the first day and the beginning of the
second dealt mainly with energy transport in flares and with .the
formation process of the hot plasma which is .
These are the Proceedings of Colloquium No. 153 of the
International Astro nomical Union, held at Makuhari near Tokyo on
May 22 - 26, 1995, and hosted by the National Astronomical
Observatory. This meeting was intended to be an interdisciplinary
meeting between re searchers of solar and stellar activity, in
order for them to exchange the newest information in each field.
While each of these areas has seen remarkable advances in recent
years, and while the researchers in each field have felt that
information from the other's domain would be extremely useful in
their own work, there have not been very many opportunities for
intensive exchanges of information between these closely related
fields. We therefore expected much from this meeting in pro viding
stellar researchers with new results of research on the
counterparts of their targets of research, spatially and
temporarily resolved, as observed on the Sun. Likewise we hoped to
provide solar researchers with new results on gigantic ver sions of
their targets of research under the very different physical
circumstances on other active stars. It was our greatest pleasure
that we had wide attendance of experts and active researchers of
both research fields from all over the world. This led to extremely
interesting talks and very lively discussions, thereby stimulating
the exchange of ideas across the fields.
The SOLAR-A spacecraft was launched by the Institute of Space and
Astronautical Science, Japan (ISS) in August 1991, and, following
and ISAS tradition, was renamed YOHKOH. This mission is dedicated
principally to the study of solar flares, especially of high-energy
phenomena observed in the X-ray and gamma-ray ranges. With a
co-ordinated set of instruments including hard X-ray and soft X-ray
imaging telescopes as well as spectrometers with advanced
capabilities, it is expected to reveal new aspects of flares and
help better understand their physics, supporting international
collaborations with ground-based observatories as well as
theoretical investigations. An overview of this mission, including
the stallite, its scientific instruments, and its operation is
given in this book.
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