Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..121b&link_type=abstract
SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,
Astronomy and Astrophysics
Astrophysics
Scientific paper
Collisions present in the solar atmosphere must be taken into account for polarization line studies. Two very different effects occur according to the angular distribution of the velocities leading either to polarization or depolarization of the lines. The first case is illustrated by its application to the diagnostic of proton beams in solar flares : the direction of polarization depends on the initial energy distribution of the beam, before propagation in the atmosphere. The case of isotropic collisions is discussed in the context of the interpretation of the "second solar spectrum" as observed with THEMIS.
Balança Christian
Feautrier N.
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