Multipoint Observations of Pi2 pulsations During Substorm Recovery

Details Multipoint Observations of Pi2 pulsations During Substorm Recovery Multipoint Observations of Pi2 pulsations During Substorm Recovery

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm22a..01l&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM22A-01

Other

2704 Auroral Phenomena (2407), 2752 Mhd Waves And Instabilities, 2768 Plasmasphere, 2788 Storms And Substorms

Scientific paper

Pi2 pulsations are usually discussed in relation to the expansion phase onset of magnetospheric substorms. Pulsations in the Pi2 band are observed at other times but the wave mode and excitation mechanism of these quiet-time Pi2 pulsations have not been identified. In this paper we examine Pi2 pulsations observed during the recovery phase of a substorm, 1300-1600 UT, January 7, 1997. The pulsations occurred as the auroral luminosity, measured by the UVI experiment on the Polar satellite, steadily declined. What is remarkable is that pulsations in the Pi2 band were present continuously. In the last hour of the 3-hour period the overall intensity of the aurora became very low (less than 1 GW) and no localized intensification of aurora is discernible in individual UVI images. The properties of the pulsations, as observed at mid- to low-latitude ground stations on the nightside, are similar to those of Pi2 pulsations associated with substorm expansions. Pulsations in the Pi2 band were also observed on the dayside. The Geotail spacecraft was located at (-30, -5, 3) Re GSE, in the plasma sheet near the Sun-Earth line, but it did not detect strong plasma flows. The observed properties of the Pi2 pulsations suggest that they originated from the same oscillation mode as usual Pi2 pulsations, but the stimulation mechanism of the mode is yet to be identified.

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