Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh42a..05p&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH42A-05
Other
7514 Energetic Particles (2114), 7519 Flares, 7526 Magnetic Reconnection (2723, 7835), 7536 Solar Activity Cycle (2162), 2111 Ejecta, Driver Gases, And Magnetic Clouds
Scientific paper
We summarize our results obtained earlier for a number of Ground Level Enhancements (GLEs) of solar cosmic rays (SCR) that have demonstrated distinctly two-component structure of relativistic solar proton populations, namely, Prompt and Delayed ones (PC and DC). Observationally, PC and DC differ from each other by the form of time profiles (pulse-like and gradual ones), pitch-angle distributions (PAD) (anisotropic and isotropic ones) and spectrum rigidity, namely, by hard (flat) and soft (steep) spectra, respectively. In particular, at the GLE onset the PC is extremely anisotropic. Theoretically, in terms of the SCR propagation theory, the DC may be treated as a result of transformation of the PC in the process of interplanetary propagation (SCR scattering at the irregularities of IMF). In general, the underlying physical circumstances leading to the initial spikes and two-peak structures in some GLEs are not presently well understood. Taking into account our modeling results, we do not believe that the above hypothesis of "an interplanetary origin" of the features mentioned cannot resolve alone the problem of relativistic proton events. There are some grounds to accept a two-source model of SCR generation itself at/near the Sun, in the frame of the concept of multiple acceleration processes in the solar atmosphere.
Miroshnichenko Leonty I.
Pérez-Peraza J. A.
Vashenyuk Eduard V.
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