Ground magnetometer responses to solar wind pressure impulses using a global magnetogram technique - case studies

Details Ground magnetometer responses to solar wind pressure impulses using a global magnetogram technique - case studies Ground magnetometer responses to solar wind pressure impulses using a global magnetogram technique - case studies

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41a2012c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM41A-2012

Physics

[2109] Interplanetary Physics / Discontinuities, [2164] Interplanetary Physics / Solar Wind Plasma, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics

Scientific paper

It has been reported that the magnetosphere has different responses to solar wind sudden impulse (SI) events. At low- and mid-latitude region, the dayside magnetometers could record either greater or smaller northward magnetic disturbances than the nightside ones. Whether this day-night asymmetry depends on interplanetary magnetic field (IMF) orientation is still controversial. We report on the ground magnetometer responses determined by a global magnetogram analysis. Based on level 2 ACE solar wind measurements at L1 point from 1998 to 2010, we have carefully chosen four SI events during which the dynamic pressure increases by at least 5 nPa in less than 5 minutes, the pressure is quasi-steady 60 minutes before and 20 minutes after the impulse, and each component of interplanetary magnetic field changes is less than 2 nT. Then we will generate a comprehensive global description of the variable geomagnetic responses to SI events.

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