Evidence of transmission of polar electric fields to the low latitude at times of geomagnetic sudden commencements

Details Evidence of transmission of polar electric fields to the low latitude at times of geomagnetic sudden commencements Evidence of transmission of polar electric fields to the low latitude at times of geomagnetic sudden commencements

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3101k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3101-3105.

Physics

35

Electric Fields, Geomagnetism, Magnetic Storms, Polar Regions, Sudden Storm Commencements, Daytime, Earth Magnetosphere, Magnetohydrodynamic Waves, Night

Scientific paper

HF Doppler measurements of geomagnetic sudden commencements (sc) are presented to demonstrate the transmission of the polar electric field responsible for the preliminary reverse impulse (PRI) to a low latitude. The data were gathered in Japan with the geomagnetic latitude of the apex of the HF signal propagation path at about 25 deg. The Doppler frequency deviations (DFD) for the observed PRIs were equivalent to those previously determined for high latitudes. The negative value for the nighttime deviation was caused by a dusk-to-dawn polar electric field that caused the PRI, which were associated with a worldwide increase in the AE index. The conclusion is that the electric field generated in the magnetosphere at the onset of an sc is transmitted to low latitudes via the polar ionosphere by means of hydromagnetic waves. The DFDs started simultaneously at high and low latitudes during the day, indicating that the westward electric field is transmitted directly from the magnetosphere by compressional hydromagnetic waves.

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