Simultaneous geomagnetic and radio auroral observations

Details Simultaneous geomagnetic and radio auroral observations Simultaneous geomagnetic and radio auroral observations

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..543h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, Aug.-Sept. 1983, p. 543-556.

Physics

3

E Region, Geomagnetic Micropulsations, Radio Auroras, Backscattering, Hall Effect, Ionospheric Electron Density, Magnetic Signatures, Power Spectra, Radar Measurement

Scientific paper

A correlative study was carried out using ground magnetometer data, which includes ordinary magnetograms and micropulsation recordings, and STARE radar auroral data from an ionospheric region above the magnetometer station. The observations are from a reasonably disturbed period which covers the evening, midnight and morning sectors. A close relationship was found to exist between the long period geomagnetic and backscatter amplitude variations which are mainly controlled by conductivity modifications in the E-region. The irregular P-sub-i pulsation activity is positively related to enhancements in backscatter intensity; the electric field strength was found to decrease considerably during P-sub-i intensifications. The relatively fast variations observed in backscatter amplitude simultaneously with impulsive P-sub-i bursts, for short time intervals in the evening sector, are possibly associated with precipitation pulsations taking place during substorm onsets. It is suggested that the major source of irregular P-sub-i noise is the auroral Hall current perturbed by electron density fluctuations which could possibly be due to the effects of the two stream and gradient drift plasma instabilities.

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