Ground-satellite correlation of low-latitude Pi 2 pulsations: A quasi-periodic field line oscillation in the magnetosphere

Details Ground-satellite correlation of low-latitude Pi 2 pulsations: A quasi-periodic field line oscillation in the magnetosphere Ground-satellite correlation of low-latitude Pi 2 pulsations: A quasi-periodic field line oscillation in the magnetosphere

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10115433s&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A7, p. 15433-15440

Physics

15

Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Energetic Particles, Trapped

Scientific paper

Magnetometer data at dip-equator and at geosynchronous altitudes (GOES 5 and 6 satellites) and energetic particle data from geosynchronous spacecraft (1982-019, 1984-037, 1984-129) are studied to investigate field line and particle signatures associated with ground Pi 2 onset. Pi 2 pulsations observed at the ground station are discussed as field disturbances that are launched in the midnight sector of the magnetosphere in association with field reconfiguration at substorm onset. In the geosynchronous orbit, both quasi-periodic field line oscillations and particle injections are often observed in the nightside sector in association with the onset of ground Pi 2 pulsations. Of 216 Pi 2 events selected in this report, 16% showed associated quasi-periodic field line oscillations. The dominant periods of the oscillations in space are similar to but not equal to those of the corresponding ground Pi 2 pulsations. The oscillations in space are polarized primarily in the azimuthal direction with a dc offset that develops to form a field-aligned current signature, namely, eastward (westward) directed in the premidnight (postmidnight) sector. Simulation of forced field line oscillations has been carried out by adding the sudden increase in plasma pressure in the equatorial midnight sector region that is expected to come from particle injection at substorm expansion onset. We discuss the relevance of the quasi-periodic oscillations to plasma injections at geosynchronous altitudes with reference to the result of the model calculations.

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