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On the presence of linear polarization in the flare on 26 June, 1999

Published online by Cambridge University Press:  14 March 2005

P. Kotrč
Affiliation:
Astronomical Institute Ondřejov, Czech Republic, email: pkotrc@asu.cas.cz
L. K. Kashapova
Affiliation:
Institute of Solar-Terrestrial Physics RAS, Irkutsk, Russia email: lkk@iszf.irk.ru
J. A. Kupryakov
Affiliation:
Astronomical Institute Ondřejov, Czech Republic, email: pkotrc@asu.cas.cz GAISH MGU, Moscow, Russia, email: kupry@sai.msu.ru
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Abstract

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Solar flare on 26 June 1999 was accompanied by radio bursts giving an indirect evidence of accelerated superthermal particle beams. It is generally believed that this effect can stimulate an impact linear polarization in Balmer series spectral lines. The flare was observed simultaneously by the Ondřejov Multichannel Flare Spectrograph (MFS) and by the Large Solar Vacuum Telescope (LSVT) using the polarization optics in the H$\alpha$ line. Spectropolarimetric data obtained by the two instruments are analyzed, however no substantial linear polarization was detected. Both spectral and auxiliary data, including radio and X-ray observations are analyzed to discuss possible reasons of the lack of linear polarization.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Copyright
© 2004 International Astronomical Union