Large Dayside Geosynchronous Magnetic Field Compressions: Model Expectations vs. Observations

Details Large Dayside Geosynchronous Magnetic Field Compressions: Model Expectations vs. Observations Large Dayside Geosynchronous Magnetic Field Compressions: Model Expectations vs. Observations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm14a..01s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM14A-01

Computer Science

Performance

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions, 7959 Models

Scientific paper

The geosynchronous magnetic field has been measured routinely for nearly 40 years. It responds to the magnetosphere's major current systems 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 show puzzling observations of large-amplitude dayside magnetic fields at geosynchronous orbit that aren't easily explained by the observed solar wind conditions. We will present an overview of the geosynchronous magnetic field variations and the related solar wind conditions. Then we compare the observations to both empirical models and results from the Lyon-Fedder-Mobarry global scale magnetospheric model. This work has two important outcomes. First, by making these model-data comparisons, we are able to validate the models' performance during these particular conditions. And, second, the diagnostic capabilities of the models enable an assessment of the dominant current systems that leads to the distinctive signatures measured in geosynchronous orbit.

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