Interhemispheric Geomagnetic Field Response to Sudden Change in Solar Wind Pressure and IMF Orientation

Details Interhemispheric Geomagnetic Field Response to Sudden Change in Solar Wind Pressure and IMF Orientation Interhemispheric Geomagnetic Field Response to Sudden Change in Solar Wind Pressure and IMF Orientation

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51a1924k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA51A-1924

Physics

[2463] Ionosphere / Plasma Convection, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

Preliminary investigation of geomagnetic field response to sudden change in solar wind pressure and IMF orientation is presented using data from satellite and ground magnetometer array in both northern and southern hemispheres. Some data sets in this study have been provided by AGO (Automatic Geophysical Observatory) and AAL-PIP (Autonomous Adaptive Low-Power Instrument Platform) stations deployed in Antarctica along the 40° magnetic meridian. These stations facilitate high-latitude multi-point magnetic conjugate observation pairs to the Greenland West Coast magnetometer chain for interhemispheric investigations, which have been rarely made because of the difficulty in accessing the Antarctic regions. Geomagnetic field perturbations in response to solar wind pressure impulse events, in which the solar wind pressure changes are more than ˜5 nPa in less than ~16 minutes and the pressures are steady for ~1 hour before and ~20 minutes after the pressure changes, have been examined using the data sets obtained from 1998 to 2010 to show global local time distribution of the ground response, timing response between the two hemispheres and its seasonal variation, and the relationship between IMF orientation and the ground response accompanied by the solar wind sudden pressure change.

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