Observations of inner plasmasphere irregularities with a satellite-beacon radio-interferometer array

Details Observations of inner plasmasphere irregularities with a satellite-beacon radio-interferometer array Observations of inner plasmasphere irregularities with a satellite-beacon radio-interferometer array

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10119665j&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A9, p. 19665-19682

Physics

5

Ionosphere: Ionospheric Irregularities, Ionosphere: Plasma Temperature And Density, Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Plasma Waves And Instabilities

Scientific paper

A radio-interferometer array illuminated by 136-MHz beacons of several geosynchronous satellites has been used to study small (>=1013 m-2) transient disturbances in the total electron content along the lines of sight to the satellites. High-frequency (f>3 mHz) electron content oscillations are persistently observed, particularly during night and particularly during geomagnetically disturbed periods. The oscillations move across the array plane at speeds in the range 200-2000 m/s, with propagation azimuths that are strongly peaked in lobes toward the western half-plane. Detailed analysis of this azimuth behavior, involving comparison between observations on various satellite positions, indicates compellingly that the phase oscillations originate in radio refraction due to geomagnetically aligned plasma density perturbations in the inner plasmasphere. The motion of the phase perturbations across the array plane is caused by EXB drift of the plasma medium in which the irregularities are embedded. We review the statistics of 2.5 years of around-the-clock data on the local time, magnetic disturbance, seasonal, and line-of-sight variations of these observed irregularities. We compare the irregularities' inferred electrodynamic drifts to what is known about midlatitude plasma drift from incoherent scatter. Finally, we show in detail how the observation of these irregularities provides a unique and complementary monitor of inner plasmasphere irregularity incidence and zonal drift.

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