Geomagnetic Micropulsations During the Passage of Interplanetary Coronal Mass Ejections

Details Geomagnetic Micropulsations During the Passage of Interplanetary Coronal Mass Ejections Geomagnetic Micropulsations During the Passage of Interplanetary Coronal Mass Ejections

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11a0791c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11A-0791

Physics

2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

In this work we present observations of geomagnetic micropulsations recorded on the Earth's surface using fluxgate magnetometers designed by the University of California, Los Angeles. The pulsations were measured during the passage of 17 solar wind structures related to interplanetary coronal mass ejections. We searched for micropulsations before the shock, and during the sheath and ejecta. Before the shock there were no occurrences of Pc3 in any of the events but we saw occurrences of Pc4 and Pc5. During the sheath Pc3 appeared and there was some increase in the number of Pc4 and Pc5 events. Finally during the ejecta the number of Pc3 pulsations increased but there was not much increase in the bands of Pc4 and Pc5. We find no clear differences in the amplitude distribution during the three phases, but the duration distribution showed a clear change with a shift of the distribution from short duration before the shock to long duration during sheath and ejecta.

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