Paper#: 11
Poster #: 10
Session Name: Poster Session 2
Room: East Ballroom
Day: Thursday
Time: 10:10 a.m.-Noon
Abstract Title: Effects in the Radiation Belts Caused by the Second Adiabatic Invariant Violation in the Presence of Dayside Cusp Magnetic Field Minima
PresentSurname: Kropotkin, A.P.
All Authors: A.E. Antonova, Y.I. Gubar', A.P. Kropotkin
Abstract : Recent experiments (INTERBALL, POLAR) provided new substantial information concerning particle populations in the high-latitude near-magnetopause cusp regions with highly depressed magnetic field. We have studied adiabaticity violation of energetic particle bounce motion while drifting in those regions. The violation is due to nonmonotonous change in magnetic field intensity along field lines near the dayside magnetopause. The violation takes place at the phase space separatrix between a region of transequatorial bounce oscillations and that of oscillations about high-latitude field minima. An invariant jump is evaluated. Diffusion over the second invariant associated with the jumps on sequential drift orbits, can result in particle phase space redistribution during magnetic substorms and storms, and corresponding exchange between the substorm-injected population on the nightside and the cusp population on the dayside. This is discussed with comparison to recent observation results.