Variations in the FUV dayglow after intense auroral activity

Details Variations in the FUV dayglow after intense auroral activity Variations in the FUV dayglow after intense auroral activity

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2793c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2793-2796

Physics

29

Atmospheric Composition, Auroras, Dayglow, Diurnal Variations, Far Ultraviolet Radiation, Geomagnetism, Magnetic Effects, Sky Brightness, Thermosphere, Brightness Distribution, Dynamics Explorer Satellites, Nitrogen, Oxygen, Photoelectrons, Photoexcitation, Resonance Scattering, Satellite Observation

Scientific paper

A localized approximately 55% decrease is observed in the brightness of Earth's FUV dayglow in the morning sector at 130.4 nm after an interval of intense geomagnetic activity. This large decrease is interpreted as being the consequence of auroral-associated heating which reduces the thermospheric column density of O relative to that of N2. Spatial extent of the observed decrease exceeds 10(exp 7) km(exp 2) at the -25% level, and the depth of the decrease lessens during more than two hours of observations. These remote observations provide the first instantaneous, two-dimensional measurement of the large-scale spatial extent of such a change in thermospheric composition.

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