Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..368..431k&link_type=abstract
The Physics of Chromospheric Plasmas ASP Conference Series, Vol. 368, Proceedings of the conference held 9-13 October, 2006 at t
Physics
1
Scientific paper
Preliminary results of empirical study of a non-thermal electron effect on Hα/Hβ line intensity ratio in solar flares are presented. Analysis of spectral observations of the 26 June 1999 flare revealed some peculiarities of the Hα/Hβ line intensity ratio (the ``sidelobes'') in the emission kernels associated with radio bursts and HXR emission that could be considered as an indirect evidence of accelerated non-thermal particle beams. According to our conclusions they appeared due to non-thermal electron beam effects. Consequently, the obtained results confirmed the theoretical predictions and bore a first witness for a detection of the spatial and temporal presence or absence of the non-thermal electron beams in optical spectra. However, as a more statistically probative evidence was needed, we extended our analysis on two flares where presence of non-thermal mechanisms of excitation was verified by HXR data. The obtained results are quite promising as concerns of diagnostics of the energy release and transfer mechanisms during the flare.
Kashapova Larisa K.
Kotrč Pavel
Kupryakov Yu. A.
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