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2008 ; 5
(ä): 1
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Flare Observations
#MMPMID27194959
Benz AO
Living Rev Sol Phys
2008[]; 5
(ä): 1
PMID27194959
show ga
Solar flares are observed at all wavelengths from decameter radio waves to
gamma-rays at 100 MeV. This review focuses on recent observations in EUV, soft
and hard X-rays, white light, and radio waves. Space missions such as RHESSI,
Yohkoh, TRACE, and SOHO have enlarged widely the observational base. They have
revealed a number of surprises: Coronal sources appear before the hard X-ray
emission in chromospheric footpoints, major flare acceleration sites appear to be
independent of coronal mass ejections (CMEs), electrons, and ions may be
accelerated at different sites, there are at least 3 different magnetic
topologies, and basic characteristics vary from small to large flares. Recent
progress also includes improved insights into the flare energy partition, on the
location(s) of energy release, tests of energy release scenarios and particle
acceleration. The interplay of observations with theory is important to deduce
the geometry and to disentangle the various processes involved. There is
increasing evidence supporting reconnection of magnetic field lines as the basic
cause. While this process has become generally accepted as the trigger, it is
still controversial how it converts a considerable fraction of the energy into
non-thermal particles. Flare-like processes may be responsible for large-scale
restructuring of the magnetic field in the corona as well as for its heating.
Large flares influence interplanetary space and substantially affect the Earth's
lower ionosphere. While flare scenarios have slowly converged over the past
decades, every new observation still reveals major unexpected results,
demonstrating that solar flares, after 150 years since their discovery, remain a
complex problem of astrophysics including major unsolved questions. ELECTRONIC
SUPPLEMENTARY MATERIAL: Supplementary material is available for this article at
10.12942/lrsp-2008-1.