HR: 11:35h
AN: SM32A-06    [Abstracts]
TI: Investigating the periodicity of sawtooth events using the Space Weather Modeling Framework (SWMF) - preliminary results
AU: * Cai, X
EM: xcai@umich.edu
AF: Bradley Department of Electrical and Computer Engineering Virginia Tech, 302 Whittemore Hall, Blacksburg, VA 24061, United States
AU: * Cai, X
EM: xcai@umich.edu
AF: Department of Atmospheric, Oceanic and Space Science University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109, United States
AU: Clauer, C R
EM: rclauer@vt.edu
AF: Bradley Department of Electrical and Computer Engineering Virginia Tech, 302 Whittemore Hall, Blacksburg, VA 24061, United States
AU: Ridley, A J
EM: ridley@umich.edu
AF: Department of Atmospheric, Oceanic and Space Science University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109, United States
AU: Toth, G
EM: gtoth@umich.edu
AF: Department of Atmospheric, Oceanic and Space Science University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109, United States
AU: Liemohn, M W
EM: liemohn@umich.edu
AF: Department of Atmospheric, Oceanic and Space Science University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109, United States
AU: Gombosi, T I
EM: tamas@umich.edu
AF: Department of Atmospheric, Oceanic and Space Science University of Michigan, 2455 Hayward Street, Ann Arbor, MI 48109, United States
AU: Kuznetsova, M M
EM: Maria.M.Kuznetsova.1@gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, Code 674, Greenbelt, MD 20771, United States
AB: By introducing a non-gyrotropic correction to the induction equation in a BATS-R-US simulation, it has been reported that periodic dipolarizations similar to sawtooth oscillations are seen at geosynchronous orbit in the magnetosphere. However the simulated periodicity reported is around 60 minutes, while the observed periodicity, obtained from a analysis of around 400 individual teeth, is about 180 minutes. We report here preliminary results from an investigation that examines how solar wind parameters may affect the periodicity using a series of Space Weather Modeling Framework (SWMF) simulations which includes the non-gyrotropic BATS-R-US model. We examine the effects of the external driving conditions by systematically changing the magnitude of solar wind dynamic pressure and interplanetary magnetic field (IMF) southward component (B_z) in the simulations.
DE: 2134 Interplanetary magnetic fields
DE: 2164 Solar wind plasma
DE: 2723 Magnetic reconnection (7526, 7835)
DE: 2740 Magnetospheric configuration and dynamics
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting