Substorm Timing and Location Using The Combined CARISMA and THEMIS GMAG Magnetometers

Details Substorm Timing and Location Using The Combined CARISMA and THEMIS GMAG Magnetometers Substorm Timing and Location Using The Combined CARISMA and THEMIS GMAG Magnetometers

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm23a1181r&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM23A-1181

Physics

2704 Auroral Phenomena (2407), 2744 Magnetotail, 2752 Mhd Waves And Instabilities (2149, 6050, 7836)

Scientific paper

With the successful launch of the THEMIS spacecraft, the expansion of the CARISMA magnetometer array, and the deployment of the THEMIS GBOs, there now exists an exceptional opportunity to study fundamental ULF wave science in the nightside magnetosphere around substorm onset. Traditionally, substorm onset is usually determined by location and timing of ULF waves in the Pi2 (40-200 second period) range. With the current configuration of ground magnetometers, it is now possible to resolve frequencies in the Pi1 (1-40 second period) band using novel techniques such as Wavelet Analysis. With this technique, the entire spectrum of ULF waves associated with substorm onset can be accurately timed to approximately half of the wave period. We use a substorm location modeling algorithm [Cramoysan et al., 1995] to produce initial estimates of the locations of the upward and downward field aligned currents and the westward electrojet. We present results from several isolated substorms and find that the onset location of the Pi1 waves starts at or close to the location of the downward field-aligned current region and propagate isotropically away from this location. We discuss the implications of this result in terms of potential generation mechanisms for Pi1 waves at substorm onset, and for the physical processes operating at the onset of the substorm expansion phase.

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