Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265.1066h&link_type=abstract
Astrophysical Journal, Part 1, vol. 265, Feb. 15, 1983, p. 1066-1075.
Astronomy and Astrophysics
Astrophysics
24
Chromosphere, Linear Polarization, Solar Flares, Solar Spectra, Ultraviolet Spectra, Electron Impact, H Alpha Line, Line Spectra, Solar Atmosphere, Solar Maximum Mission, Solar X-Rays
Scientific paper
Linear polarization was observed in the S 11437 A line in bright flaring points during the soft X-ray emission from a flare on 1980 July 15. The degree of polarization is about 25% and is detected at a signal-to-noise ratio of 2.9. The polarized electric vector is directed toward disk center to within 3°.
This polarization could be due to collisional excitation of S I by energetic electrons beamed in the vertical direction. Direct excitation by a highly energetic beam of electrons of order 10-100 keV is doubtful. We suggest that the heat flux in the region connecting the transition zone to the high chromosphere during the gradual phase of a flare could lead to an anisotropic excitation. Then the observed polarization would be due to vertical motions of the transition zone sweeping the preexisting chromosphere.
Beckers Jacques
Chambe Gilbert
Hénoux Jean-Claude
Machado Magno
Sahal S.
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