Non-uniform precipitation of solar energetic particles across the Earth's polar caps

Details Non-uniform precipitation of solar energetic particles across the Earth's polar caps Non-uniform precipitation of solar energetic particles across the Earth's polar caps

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm42d..05m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM42D-05

Statistics

2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2776 Polar Cap Phenomena, 7514 Energetic Particles (2114)

Scientific paper

The Earth's magnetic field has a complex influence on the precipitation of solar energetic particles into the atmosphere at high latitudes. Besides the time-dependent cutoff latitude, one often observes large (> factor of 4) changes in the intensity of solar particles particles as a low-altitude satellite traverses the polar caps. These features were first observed in low-Earth orbit and modeled in the 1970's (e.g. Scholer 1972). Factors such as delayed particle access from deep in the magnetotail, favored access to one pole or the other due to the polarity of the interplanetary magnetic field; and quasi-trapping just above the cutoff latitude were thought to play a role. We revisit these phenomena using the high-sensitivity instruments on the SAMPEX satellite at 600km altitude. We will test the previous concepts and models of solar particle access across a wider range of particle rigidity (10's to 100's MV) and with better statistics than has been done in the past. At the meeting we will quantify non-uniform particle illumination in many events from 1992-2003, including the 14-24 April 2002 interval, and discuss its impact on calculations of the solar particle energy deposit into the atmosphere. M. Scholer, J. Geophys. Res. 77, 2762-2769, 1972.

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