HR: 0800h
AN: SM41C-1206    [Abstracts]
TI: Low latitude precipitation of energetic neutral atoms reflects the ring current pitch angle distribution during storms
AU: * Sorbo, M
EM: marita@ift.uib.no
AF: University of Bergen, Department of Physics and Technology, Allegt 55, Bergen, 5007 Norway
AU: Soraas, F
EM: finn@ift.uib.no
AF: University of Bergen, Department of Physics and Technology, Allegt 55, Bergen, 5007 Norway
AU: Aarsnes, K
EM: kjell.aarsnes@ift.uib.no
AF: University of Bergen, Department of Physics and Technology, Allegt 55, Bergen, 5007 Norway
AU: Oksavik, K
EM: kjellmar.oksavik@fys.uio.no
AF: Johns Hopkins University, Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Evans, D S
EM: David.S.Evans@noaa.gov
AF: NOAA Space Environment Center, Broadway 325, Boulder, CO 80305 United States
AB: The pitch angle distribution of the ring current ions determines the latitude extent of the Storm Time Equatorial Belt (STEB) of energetic particles. The STEB is generated by ENAs produced in the ring current. An isotropic ring current, prevailing during particle injection generates a STEB with maximum intensity off equator, around 35-40 magnetic latitudes. During the storm recovery phase the particle injection ceases, the ring current becomes more symmetric and the pitch angle distribution develops from an isotropic one to a more pancake shaped. This has the effect that the peak of the STEB moves from mid-latitudes toward the equator. Storm time observations of the STEB done by the NOAA satellites which shows this behaviour are presented and related to theory.
DE: 2700 MAGNETOSPHERIC PHYSICS (6939)
DE: 2716 Energetic particles: precipitating
DE: 2720 Energetic particles: trapped
DE: 2730 Magnetosphere: inner
DE: 2778 Ring current
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005