Hα Line Polarization in the Major Flare of 2002 July 23. I. Observations and Data Analysis

Details Hα Line Polarization in the Major Flare of 2002 July 23. I. Observations and Data Analysis Hα Line Polarization in the Major Flare of 2002 July 23. I. Observations and Data Analysis

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...595l.131f&link_type=abstract

The Astrophysical Journal, Volume 595, Issue 2, pp. L131-L133.

Astronomy and Astrophysics

Astronomy

11

Sun: Flares, Techniques: Polarimetric

Scientific paper

On 2002 July 23, a major 2B/X4.8-class flare was observed in Hα lines with the Large Solar Vacuum Telescope of the Baikal Astrophysical Observatory using the spectropolarimetric method. Linear polarization of 3%-10% has been detected in Hα lines of the flare, particularly in the Hα lines with a central reversal. They are mainly radial on the solar disk and appear at the impulsive phase of hard X-ray and γ-ray bursts. The polarization changes its direction in a spatially limited small region (~4"-5") and within a short period of time (~10 s). Moreover, the linear polarization is limited to only some relatively small regions of the flare.

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