Statistical analysis of Pi2 pulsation by polar orbiting DE-1 satellite and three mid- and low- latitude ground stations

Details Statistical analysis of Pi2 pulsation by polar orbiting DE-1 satellite and three mid- and low- latitude ground stations Statistical analysis of Pi2 pulsation by polar orbiting DE-1 satellite and three mid- and low- latitude ground stations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41b1461t&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM41B-1461

Physics

2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2768 Plasmasphere, 2790 Substorms

Scientific paper

Some previous studies have shown that the mid- and low- latitude Pi2 pulsations can be explained by a resonance mechanism in the inner magnetosphere (cavity mode), analyzing magnetic field data from ground stations and satellites. In these studies, satellites orbiting near the equatorial plane were used; there is no statistical study of Pi2 by polar orbiting satellites. We have been statistically analyzing Pi2 pulsations, using the 6-second magnetic field data acquired by the polar orbiting DE-1 satellite which has a perigee of about 500 km and an apogee of about 3.6 Re. The data period used here is from January 1983 to December 1985. At first we identified substorm onsets with AL index. For these substorm onset we checked if Pi2 pulsation is observed in the H component of geomagnetic field data at Kakioka (27.37 degree GMLAT, 208.75 degree GMLON), Crozet (-51.35 degree GMLAT, 113.27 degree GMLON), or Port Aux Francais (-56.93 degree GMLAT, 132.75 degree GMLON) which satisfy the following two criteria: (a) At least one of these stations are located near the midnight (21 - 03LT) at a substorm onset and (b) the wave power spectrum has a peak in the Pi2 frequency band (6.7 - 25 mHz). These event selection criteria yielded 442 events. Then we calculated the coherence of the magnetic field variations between the DE-1 and the ground station. Out of the 442 events, 251 events were found to have coherence larger than 0.6, being used in the following analysis. We calculated the power of the magnetic field variations at DE-1 and the phase difference of the magnetic field variations between the DE-1 satellite and ground station. We statistically examined the MLT-L distributions of these quantities at \|GMLAT\|= 0 - 30 degree, 30 - 60 degree, and 60 - 90 degree, according to the position of DE-1. It was found that (1) the Pi2 power in the compressional component decreased as the geomagnetic latitude of the satellite increased, (2) those of the azimuthal and radial components increased with geomagnetic latitude, (3) the phase difference between the magnetic field variation observed by DE-1 in compressional component and that on L greater than 5Re. These results suggest the cavity mode on the night side.

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