The Solar Cycle and Energetic Particle Streaming Patterns in and around the Terrestrial Magnetosphere

Details The Solar Cycle and Energetic Particle Streaming Patterns in and around the Terrestrial Magnetosphere The Solar Cycle and Energetic Particle Streaming Patterns in and around the Terrestrial Magnetosphere

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....7.4057k&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

Scientific paper

Statistical characteristics of ion fluxes and anisotropies in local interplanetary space and in the magnetospheric boundary region vary with the phase of the solar cycle. Monitoring by the IMP-8 mission provided nearly 28 years of intensity and anisotropy data of energetic particles for a variety of energies and particle species. For our present purposes the best data set is that for 0.29 to 0.5 MeV ions (mainly protons) as measured by the CPME experiment of JHU/APL. Both directional and omnidirectional intensities change nearly in phase with the solar cycle. Spacecraft-frame anisotropies show a more complex behaviour. When yearly medians of hourly directional fluxes are evaluated for 8 in-ecliptic directions without taking into account the orbital position of the spacecraft the resulting yearly anisotropy pattern hardly changes over the solar cycle. However, when data are classified according to spacecraft position relative to a model magnetosphere, the anisotropy pattern is found to depend strongly on both position and solar cycle phase. Large solar cycle variations of the anisotropy (or streaming pattern) extend even to the far upstream region.

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