CORONAS-F observation of HXR and gamma-ray emissions from the solar flare X10 on 29 October 2003 as a probe of accelerated proton spectrumстатья
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Аннотация:Abstract. HXR and gamma-ray emissions in the 0.04–150 MeV energy range
associated with the solar flare on 29 October 2003 (X10/3B) were observed
at 20:38–20:58 UT by the SONG instrument aboard the CORONAS-F mission.
We restored consecutive flare gamma-emission spectra from SONG and
RHESSI data and found a good agreement of these spectra in the 0.1–10 MeV
energy range. Two phases were identified which showed major changes in the
spectral shape of flare emission: 20:38:00-20:44:20 UT and 20:44:20-20:58:00
UT. During the second phase an efficiency of proton acceleration increased
considerably relatively to the efficiency of acceleration of high energy electrons.
The pion-decay component of the flare gamma-emission was elicited statistically
significant only during the second phase since 20:47:40 UT. A power law
spectrum index of accelerated protons was estimated from the ratio between
intensities of the pion-decay and gamma-line components. The hardest spectrum
(power law index S=3.7) was at 20:48–20:51 UT when the intensity of the
pion-decay emission was maximal. Our subdivision of the flare into two phases
is consistent with sharp changes in the structure of the flare found by Ji et al.
(2008) and Liu et al. (2009).
This flare was accompanied by GLE 66. The time profile of the pion-decay
gamma-emission was compared with the GLE onset time. It was shown that
both protons interacting at the Sun and the particles responsible for the GLE
onset could belong to the same population of accelerated particles.