Trapped Solar Energetic Particles in the Inner Magnetosphere in Solar Cycle 23

Details Trapped Solar Energetic Particles in the Inner Magnetosphere in Solar Cycle 23 Trapped Solar Energetic Particles in the Inner Magnetosphere in Solar Cycle 23

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm23c..02m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM23C-02

Physics

2114 Energetic Particles (7514), 2139 Interplanetary Shocks, 2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2774 Radiation Belts

Scientific paper

A wide range of instrumentation on spacecraft such as SAMPEX, Polar, and HEO vehicles has been sampling the diverse trapped and transient particle populations in the Earth's magnetosphere during solar cycle 23. We will review the observational facts of the intriguing phenomenon of the creation of new radiation belts near L-shells of 2-3 during intense SEP events and CME-related shocks. New radiation belts in this region of the magnetosphere had been glimpsed with shorter-lived missions as long as 40 years ago. In the talk we will use magnetospheric particle sensors with wide energy coverage and mass composition, combined with upstream solar wind and SEP monitors, to survey the conditions that might be necessary to form these new belts. These necessary ingredients appear to include a source population of solar particles, access to low L-shells due to supressed particle cutoffs, and trapping due to non-adiabatic effects. The presence of ~1 MeV/n ions up to iron in some events provides a new diagnostic of the entire trapping process. We will review the published instances of the new belts, and examine the maximum observed energies of the trapped heavy ions.

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