Relativistic proton production at the Sun in the January 20, 2005 eventстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
Аннотация:Abstract
Based on the concept of multiple acceleration of solar energetic particles (SEP) we analyzed the super-event of 20 January 2005 by the
data of ground level, balloon and spacecraft observations. The main characteristics of relativistic solar protons (energy spectra, anisotropy
directions and pitch-angle distributions) are derived and their dynamics during the event is studied. It is shown that the flux of relativistic
solar protons may consist of two distinct components, the so-called prompt and delayed ones. Within a two-source model of
particle generation, one of which is associated with an expanding magnetic loop, we solved the transport equation in energy phase space,
including adiabatic losses simultaneously with the stochastic acceleration process, and calculate the expected spectra of the delayed component
at the source. The confrontation of experimental spectra with theoretical ones shows that the delayed component may be correctly
described by stochastic acceleration, but not the prompt component. The required acceleration efficiencies turned out to be
rather high, so that, for this particular event, adiabatic cooling is practically negligible. Our results provide a new support to the existence
of two populations of relativistic solar protons in some SEP events.