Parameters of the flare and surrounding medium and their evolution during 20 January 2005 solar eventстатья

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Дата последнего поиска статьи во внешних источниках: 7 декабря 2013 г.

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1. Полный текст ECRS_VKKL-2012_IOP.pdf 1,0 МБ 1 декабря 2013 [troi]

[1] Parameters of the flare and surrounding medium and their evolution during 20 january 2005 solar event / E. Troitskaia, I. Arkhangelskaja, A. Arkhangelsky, W. Gan // Journal of Physics: Conference Series. — 2013. — Vol. 409, no. /1/012204. — P. 1–9. Basing on the data of AVS-F apparatus from SONG-D detector onboard CORONAS-F satellite, we have studied the extreme solar event of January 20, 2005 used the 2.223 MeV, 4.44 MeV and 6.13 MeV gamma-lines temporal profiles. By the statistical modeling method we calculated the temporal profile of 2.223 MeV line. Calculations were performed in assumption of Bessel type of accelerated particles energy spectrum, different 3He content in the region of nuclear reactions and several density models of the solar atmosphere. Comparison of the results of modeling with observational 2.223 MeV data reveals the increasing of the ratio of 3He concentration to 1H one during the flare from 2x10-5 at the rise phase of the gamma-ray flux up to 2x10-4 at the decay one. During the same period the spectrum became harder, spectral index changed from αT=0.005 up to 0.1, and the density of solar atmosphere increased too. Averaged over full time of 2.223 MeV gamma-emission, concentration ratio of 3He/1H is equal to (1.40±0.15)x10-4, the spectral index of accelerated protons αT=0.1 for the energy interval of 0.1-100 MeV and the density model with enlarged density up to 2x1017 cm-3 in the lower chromosphere and through the whole photosphere is realized.. Using the AVS-F/SONGD/ CORONAS-F gamma-ray spectral data in the wide range up to 140 MeV, we have estimated the spectral index as s≈2.5 in the case of power law spectrum of accelerated particles for energies more than 300 MeV. [ DOI ]

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