HR: 15:30h
AN: SM44A-01    [Abstracts]
TI: Simulations of Solar Minimum and Solar Maximum Multi-dip Storms
AU: * Jordanova, V K
EM: vania.jordanova@unh.edu
AF: University of New Hampshire, Space Science Center and Department of Physics, Durham, NH 03824 United States
AU: Farrugia, C J
EM: charlie.farrugia@unh.edu
AF: University of New Hampshire, Space Science Center and Department of Physics, Durham, NH 03824 United States
AU: Thomsen, M F
EM: mthomsen@lanl.gov
AF: Los Alamos National Laboratory, Space and Atmospheric Sciences, Los Alamos, NM 87545 United States
AB: The ring current represents the essential element of all geomagnetic storms; however, what mechanisms are important for the acceleration and loss of energetic particles during stormtime and how they relate to the solar wind drivers are not well understood. We use our global physics-based model to simulate ring current evolution during several large multi-dip storms that occurred during solar minimum, the rising phase of the solar cycle, and solar maximum conditions: the October 18, 1995 magnetic cloud, and the complex ejecta in early May 1998 and in October 21-25, 2001. We compare these storms in terms of ring current injection, morphology, role of dense plasma sheet, ion composition, and relative importance of particle loss mechanisms. We investigate the effect of varying solar activity, as reflected in near-Earth interplanetary conditions, on ring current evolution and how large geomagnetic storms form.
DE: 2720 Energetic particles, trapped
DE: 2730 Magnetosphere--inner
DE: 2753 Numerical modeling
DE: 2778 Ring current
DE: 2788 Storms and substorms
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly