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On the Correlation between Spectra of Solar Microwave Bursts and Proton Fluxes near the Earth View all abstracts by submitter

Ilya Chertok   Submitted: 2009-11-11 06:26

Studies of the extreme solar proton event of January 20, 2005 intensified the contest over of a long-standing problem: are solar cosmic rays arriving at the Earth accelerated by solar flares or by shocks preceding rapidly moving coronal mass ejections? Among the most important questions is the relationship between the energy spectra of the solar cosmic rays and the frequency spectra of flare microwave bursts. Some studies of previous solar-activity cycles have shown that such a relationship does exist, in particular, for protons with energies of tens of MeV. The present work analyzes this relation using data for 1987-2008. For flare events observed in the western half of the disk, there is a significant correlation between the index d=log(J10/J100), (J10 and J100 are the peak proton fluxes at E > 10 and 100 MeV, respectively; d is equivalent to the power-law index of the integrated energy spectrum of 10-100 MeV protons detected near the Earth's orbit) and radio burst parameters such as a ratio of peak fluxes S at two frequencies (for example, at 9 and 15 GHz) and a microwave peak frequency fm. Proton fluxes with hard (flat) energy spectra (d~<1.5) correspond to hard microwave frequency spectra (S9/S15~<1 and fm>15 GHz), while flares with soft radio spectra (S9/S15>~1.5 and fm~<5 GHz) result in proton fluxes with soft (steep) energy spectra (d>~1.5-2). It is also shown that powerful high-frequency bursts with the hardest radio spectra (fm~30 GHz) can point at acceleration of significant proton fluxes in flares occurring in strong magnetic fields. These results argue that solar cosmic rays (or at least their initial impulses) are mainly accelerated in flares associated with impulsive and post-eruptive energy release, rather than in shocks driven by coronal mass ejections.

Authors: I. M. Chertok, V. V. Grechnev, and N. S. Meshalkina
Projects: None

Publication Status: Astronomy Reports, 2009, Vol. 53, No. 11, pp. 1059-1069.
Last Modified: 2009-11-12 07:48
Go to main E-Print page  Diagnostics of energetic electrons with anisotropic distributions in solar flares I. Hard X-rays bremsstrahlung emission  Sun-as-a-Star, Chromospheric Lines, 1974-2009  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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