Some Statistical Properties of the Decay Phase of SEP-Events

Details Some Statistical Properties of the Decay Phase of SEP-Events Some Statistical Properties of the Decay Phase of SEP-Events

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3503k&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

2

Scientific paper

Generalized parameters characterizing the state of the interplanetary medium (IM) include the functional form and the rate of decline of charged particle flux in solar energetic particle (SEP) events. The shape of the particle flux decline is of particular importance: power-law time dependence indicates the dominance of diffusive propagation, whereas exponential-law decline emphasizes adiabatic deceleration and convection. A statistical investigation extended for a long period suggests that about 90% of SEP decays are characterized by exponential declines. Variation of the decay time with energy and angular distance of the observer from the flare are considered as well.

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