SuperDARN Observations of Pi2 Electric Field Pulsations during THEMIS Substorms

Details SuperDARN Observations of Pi2 Electric Field Pulsations during THEMIS Substorms SuperDARN Observations of Pi2 Electric Field Pulsations during THEMIS Substorms

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1688b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1688

Physics

2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2760 Plasma Convection (2463), 2790 Substorms

Scientific paper

The NASA THEMIS mission is focused on resolving the time sequence of events that occur in the magnetotail during the onset of the expansion phase of magnetospheric substorms. In support of THEMIS mission goals, the SuperDARN community is using a special camping-beam mode during THEMIS conjunctions over North America to maximize the temporal resolution of measurements of ionospheric convection during THEMIS substorm events. The SuperDARN THEMIS mode provides 8-second resolution on a single camping beam while simultaneously marching through each beam of the normal 2-minute scan. In this paper, we present SuperDARN measurements of ULF waves identified on SuperDARN camping beams during the onsets of several THEMIS substorms. These events clearly demonstrate the gains in temporal resolution that can be achieved using the THEMIS camping-beam mode. The characteristics of the Pi2 oscillations measured by the SuperDARN radars are found to be very similar to those seen by nearby ground-based magnetometers.

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