The ionospheric signature of Pi 2 pulsations observed by STARE

Details The ionospheric signature of Pi 2 pulsations observed by STARE The ionospheric signature of Pi 2 pulsations observed by STARE

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9710621s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A7, July 1, 1992, p. 10,621-10,636. Research sponsored by Max-Pla

Physics

6

Background Radiation, Earth Magnetosphere, Magnetic Signatures, Magnetic Storms, Magnetohydrodynamic Waves, Auroral Zones, Earth Ionosphere, Electric Fields, Ionospheric Currents, Magnetometers

Scientific paper

In an effort to extend the work of Sutcliffe and Nielsen (1990) in which a classical Pi 2 pulsation was first isolated in Scandinavian Twin Radar Experiment (STARE) data, a high-pass-filtering technique is used to remove the background electric field in the STARE data and thus reveal the spatial and temporal ionospheric signatures of the Pi 2 pulsation electric fields. A number of events are identified and examples presented in which pulsation electric fields up to 50 mV/m are observed. Magnetic field oscillations computed from the filtered STARE data using the Biot-Savart law correlate well with pulsation magnetometer data. A 180-deg phase difference is observed between high- and low-latitude X component pulsations. The ionospheric signature of a Pi 2 is located slightly poleward of the core of the auroral breakup region where the southward, westward, and northward directed background electric fields converge; the strongest pulsation fields occur in the region of equatorward directed electric fields.

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