Characteristics of Long-period ULF at Ground and Satellite during Huge Magnetic Storms

Details Characteristics of Long-period ULF at Ground and Satellite during Huge Magnetic Storms Characteristics of Long-period ULF at Ground and Satellite during Huge Magnetic Storms

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31a0304f&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM31A-0304

Other

2721 Field-Aligned Currents And Current Systems (2409), 2784 Solar Wind/Magnetosphere Interactions, 7900 Space Weather

Scientific paper

Long-period continuous pulsations during huge magnetic storms were studied by using ground-based magnetometer data from the CPMN (the Circum-pan Pacific Magnetometer Network) and the INTERMAGNET (International Real-time Magnetic Observatory Network) stations, and satellite magnetometer data from CHAMP which is the low-altitude advanced satellite. We examined the wave characteristics and the generation mechanisms of the phenomenon from the comparison analysis of the ground and the satellite magnetometer data. As an analytical condition, the magnetic storm below the Dst index -300nT was handled as a huge magnetic storm. Over a 15-year period (1990 to 2004) there were several huge magnetic storms satisfying this condition, but in this presentation we only examined two events: (1) 15-17 July 2000 (-301nT of minimum Dst index) and (2) 29-31 October 2003 (-401nT of minimum Dst index). The magnetic data band-pass-filtered (T=300-1000[s]) was used to understand a fundamental wave characteristic of the long-period pulsation. A global ULF wave (period is 300-700 [s], north-south component) was observed coherently at low-to-middle latitude (L<4) during the magnetic storm recovery phase of both events. This observation provided that the changes of solar wind dynamic pressure are related to the generation of the coherent ULF wave. On the other hand, when L>4, we confirmed that various local locations had their own different ULF waves (frequencies). However, at selected locations for L>4, we found that ULF waves have good correlation with the global ULF wave observed at low-to-middle latitude. We discuss that (1) wave characteristic of east-west component that depend on latitude and longitude, (2) correlation with solar wind data, and (3) result of comparison analysis with magnetic field data of low-altitude advanced satellite CHAMP and ground-based data.

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