Computer Science
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.477..191v&link_type=abstract
In: Proceedings of the Second Solar Cycle and Space Weather Euroconference, 24 - 29 September 2001, Vico Equense, Italy. Editor:
Computer Science
2
Solar Flares, Polarization
Scientific paper
Observations of linear polarization of lines (mainly Hα) during solar flares have been reported. The orientation (predominantly radial) and magnitude of the Hα polarization (about 5%) suggest an interpretation as impact polarization by low energy (<200 keV) non-thermal protons, which are not accessible by more direct diagnostic observations, such as hard X-rays (for non-thermal electrons) or gamma-ray lines (for high energy protons, above a few MeV) which will be observed by the HESSI spacecraft, soon to be launched by NASA. Impact polarization observations could thus provide useful complementary data for the study of accelerated particles in flares. However, observations in a single line such as Hα can give at best an order of magnitude estimate of the accelerated protons number flux, so multiline polarimetric observations, as can be done by the franco-italian THEMIS telescope, are highly desirable.
Hénoux Jean-Claude
Sahal-Bréchot Sylvie
Vogt Enrico
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