Abstract
The kinetic energy spectra of solar energetic parti- cle (SEP) events contain information on the particle acceler- ation mechanisms. A novel approach is proposed to investi- gate the time evolution of the spectral shape for the 20 Febru- ary 2002 SEP event. Proton differential fluxes recorded by the ERNE instrument aboard SOHO, in the energy range 1.67 112 MeV, are analyzed. The solar source is associated with this SEP event by studying solar and interplanetary con- ditions during the considered time period. The energy spec- trum evolution is studied by evaluating the time history of Shannon's differential entropy derived from the SEP fluxes. Our findings suggest that particle acceleration in the consid- ered event is produced by a perpendicular shock in the solar corona. Moreover, dropouts in the particle flux are clearly identified up to energies of at least 10 MeV.
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