Energetic and Dynamic Response of the Magnetosphere and Ionosphere to Solar Wind Dynamic Pressure Impulse

Details Energetic and Dynamic Response of the Magnetosphere and Ionosphere to Solar Wind Dynamic Pressure Impulse Energetic and Dynamic Response of the Magnetosphere and Ionosphere to Solar Wind Dynamic Pressure Impulse

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm44a..07l&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM44A-07

Physics

2716 Energetic Particles: Precipitating, 2736 Magnetosphere/Ionosphere Interactions (2431), 2740 Magnetospheric Configuration And Dynamics, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

We present a case study of magnetospheric and ionospheric response to the sudden enhancement of solar wind dynamic pressure on 21-22 January 2005. The event was triggered by a fast-moving interplanetary shock at a speed exceeding 900 km/s, which was followed by an interplanetary coronal mass ejection (ICME). In the sheath region between the shock front and the trailing ICME, the solar wind dynamic pressure was highly elevated with a peak value around 80 nPa, and the IMF Bz oscillated between north and south. While the minimum value of the Dst index was about -100 nT, the solar wind dynamic pressure corrected Dst value reached -160 nT. Multi-instrument observations from the low-altitude ionosphere including ground based and low-earth orbiting satellites from NOAA, along with measurements at geosynchronous orbit, are used to assess the global energy partitioning in response to solar wind dynamic pressure impulse. In addition, numerical simulations from the Ring- current Atmosphere interaction Model (RAM) are carried out to shed light on the underling physical processes that may be responsible for the unusually large energy injection into the ring current. We also show the intercomparison between the RAM simulations and the IMAGE-ENA images of the ring current energy content during the event.

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