HR: 08:15h
AN: SM51D-02    [Abstracts]
TI: Ring Current and Dayside Compressions Observed in the Geosynchronous Magnetic Field
AU: * Singer, H J
EM: howard.singer@noaa.gov
AF: NOAA Space Environment Center, 325 Broadway, Boulder, CO 80305 United States
AU: McPherron, R L
SM51D-02 AF: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, Los Angeles, CA 90095 United States
AU: Onsager, T G
SM51D-02 AF: NOAA Space Environment Center, 325 Broadway, Boulder, CO 80305 United States
AB: The geosynchronous magnetic field has been measured routinely for over 30 years. It responds to major current systems in the magnetosphere, including the magnetopause current, the ring current, field-aligned currents, and the tail current. As a consequence, these measurements are valuable for probing many aspects of solar wind-magnetosphere coupling. In this presentation we will present new observations of long-term (many day) shifts in the magnetic field topology at geosynchronous orbit that reflect changes in the ring current and the ring current asymmetry. Another interesting variation in the geosynchronous magnetic field is large-amplitude dayside fields that are not easily explained by the observed solar wind conditions. We will present an overview of the solar wind conditions that are related to these geosynchronous magnetic field variations.
DE: 2740 Magnetospheric configuration and dynamics
DE: 2778 Ring current
DE: 2784 Solar wind/magnetosphere interactions
DE: 2788 Magnetic storms and substorms (7954)
SC: SPA-Magnetospheric Physics [SM]
MN: Fall Meeting 2005