Post-storm mid-latitude green aurora and electron precipitation

Details Post-storm mid-latitude green aurora and electron precipitation Post-storm mid-latitude green aurora and electron precipitation

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29..405o&link_type=abstract

Planetary and Space Science, vol. 29, Apr. 1981, p. 405-413.

Physics

3

Auroras, Electron Precipitation, High Energy Electrons, Magnetic Storms, Midlatitude Atmosphere, Airglow, Atmospheric Attenuation, Diurnal Variations, Earth Ionosphere, Geomagnetism

Scientific paper

Unusual auroral emission at mid-latitudes, showing nearly exclusively the green oxygen line and taking place during the early part of the recovery phase after strong magnetic storms, is described. The lifetime of the emission extends to several hours; the emission consists of cloud-like patches and appears quite isolated at medium latitudes with no simultaneous aurorae at higher latitudes. The name 'post-storm mid-latitude green aurora' is suggested for this emission. For the event observed on the night of August 29-30, 1978, additional ionospheric measurements from heights below the mid-latitude aurora are available from nearby observations. It is shown that the emission was observed just at the beginning of a post-storm effect in ionospheric absorption. The optical and absorption data are used to extract information and precipitating high-energy electrons, which are assumed to be the cause of both the optical emission and excessive absorption. On the night in question, precipitating electrons with fluxes above the quiet-time level and energies up to at least 200 keV were found in a region extended in latitude and probably even more extended in longitude.

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