Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh33b1835p&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH33B-1835
Physics
Plasma Physics
[7845] Space Plasma Physics / Particle Acceleration
Scientific paper
Data of Relativistic Solar Protons (RSP)allow the determination of particle energy spectra in successive moments of time. Spectra of RSP in a number of large solar events tend to indicate the existence of multi-step acceleration at/near the Sun. Here, we study the generation of RSP by neutral current sheet, stochastic, and shock-wave acceleration, within the frame work of two-component concepts for ground level enhancements(GLEs)of solar cosmic rays(SCRs). Our analysis of observational data and theoretical arguments rules out the interplanetary propagation as the origin for these two components. In this work the study is done for the large solar events(GLEs) of 1989 September 29, 2000, July 14, 2003 October 28,and 2005 January 20. Based on a two-source model for SCR spectrum formation at the Sun, we carried out theoretical calculations of spectra in the sources for both components. We show that the processes in neutral current sheet, together with stochastic acceleration in expanding magnetic trap in the solar corona are able to explain the production of two different relativistic components. Shock acceleration in the presence of coronal mass ejection(CME) fits fairly only the non relativistic range of the SCR spectrum, but fails in the description of relativistic protons spectra.
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