Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh13b1526f&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH13B-1526
Physics
2774 Radiation Belts, 7509 Corona, 7514 Energetic Particles (2114), 7524 Magnetic Fields
Scientific paper
Stable particle trapping in the complicated magnetic field of the solar corona -- "solar radiation belts" -- at first seems unlikely in the face of the Sun's complex, variable magnetic field. By integrating particle orbit equations in the guiding-center approximation, we investigate the fates of energetic ions in model coronal magnetic fields. We use both PFSS (Potential Field Source Surface) and simple analytic field models. Contrary to naive expectation, we find that significant numbers of particles remain trapped more than long enough to circumnavigate the Sun, neither precipitating to the surface nor attaining open field lines. The drift "shells" corresponding to conservation of the third adiabatic invariant may be complicated in form. A close look at the dependence of the cross-field drift speed on magnetic field strength and topology accounts for this finding.
de Rosa Marc
Frewen Shane
Hudson Hugh H.
MacKinnon Alec
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