The Consequences of Cusp Trapping

Details The Consequences of Cusp Trapping The Consequences of Cusp Trapping

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32c..08s&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM32C-08

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2720 Energetic Particles, Trapped

Scientific paper

With the discovery of trapped MeV electrons in the Earth's cusp by POLAR, [Sheldon et al. 98] we have proposed that stochastic acceleration in a quadrupole cusp may provide a highly efficient acceleration mechanism for charged particles [Sheldon 00]. This hypothesis explains several previously unaccounted characteristics of the dynamics of the Earth's outer radiation belts, such as the preponderance of electrons over protons, and the correlation to high speed streams. The ubiquity of quadrupole cusps in space plasmas allows us to make predictions for other planets and anomalous cosmic rays, which are surprisingly close to observations where we have them. One difficulty in analyzing this population is finding an appropriate way to visualize the trapping region, and the consequences of variation in the fields. We address this problem with a Hamiltonian approach that not only delimits the cusp trap, but describes its diffusive behavior as well. We also present a graphical tool for visualizing this region. R.B. Sheldon, H.E. Spence, J. Sullivan, T.Fritz, J.Chen, "The Discovery of Trapped Energetic Electrons in the Outer Cusp", Geophy. Res. Lett., 25, 1825, 1998. R.B. Sheldon, ``The Bimodal Magnetosphere and Ring Current, Radiation Belt, and Tail Transducers'', Adv. in Space Res. 25, 2347--2356, 2000.

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