Non-adiabatic Effects on Energetic Particles Drifts Near the Dayside Magnetopause

Details Non-adiabatic Effects on Energetic Particles Drifts Near the Dayside Magnetopause Non-adiabatic Effects on Energetic Particles Drifts Near the Dayside Magnetopause

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm11a1585w&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM11A-1585

Physics

2700 Magnetospheric Physics (6939), 2720 Energetic Particles: Trapped, 2731 Magnetosphere: Outer, 2753 Numerical Modeling, 2774 Radiation Belts

Scientific paper

Near the dayside magnetopause, the magnetospheric magnetic field is compressed, resulting in so-called "W-shaped" magnetic field regions where the strength of the field has two local minima at off-equatorial points. When charged particles in the radiation-belts energy range drift through the region, they undergo drift-shell bifurcation resulting in bifurcating shells, also known as Shabansky orbits. In this paper, we analyze violations of the second adiabatic invariant due to drift-shell bifurcation. The effect was previously shown to be small if the magnetic field is symmetric in the north-south and east-west directions, for particles with gyroradii very small compared to the scale size of the magnetosphere. In this paper, we present results showing that if the magnetic field does not possess such symmetry, mainly due to the presence of the IMF By component, the effect becomes significant even for particles with small gyroradii, and we quantify violations of the second invariant for typical magnetospheric and solar wind conditions.

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