Wavelike oscillations of an auroral arc and possible parametric excitation of Pi2 geomagnetic pulsations

Details Wavelike oscillations of an auroral arc and possible parametric excitation of Pi2 geomagnetic pulsations Wavelike oscillations of an auroral arc and possible parametric excitation of Pi2 geomagnetic pulsations

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ge%26ae..32...42g&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 32, no. 4, p. 42-47.

Physics

Auroral Arcs, Earth Magnetosphere, Geomagnetic Micropulsations, Ionospheric Conductivity, Hall Effect, Ionospheric Currents, Magnetic Storms, Plasmasphere

Scientific paper

It is shown that, in the preliminary substorm phase, an equatorward-moving auroral arc can experience oscillations that travel along the arc with a phase velocity of 2-4 km/s. The spectral-density peak of the oscillations is in the 70-130 sec range and coincides with the prevailing oscillation periods of geomagnetic pulsations observed at auroral-zone latitudes. The data obtained are interpreted on the basis of a parametric excitation mechanism of Pi2 pulsations owing to a sharp intensification of the integral ionospheric conductivity.

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