Extreme ultraviolet emissions for monitoring auroras in dark and daylight hemispheres

Details Extreme ultraviolet emissions for monitoring auroras in dark and daylight hemispheres Extreme ultraviolet emissions for monitoring auroras in dark and daylight hemispheres

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4261m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 1, 1985, p. 4261-4268.

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Auroral Spectroscopy, Extreme Ultraviolet Radiation, Geomagnetism, Oxygen Spectra, Brightness, Dayglow, Magnetic Storms, Satellite Sounding, Solar Terrestrial Interactions, Temporal Distribution

Scientific paper

Observations of auroral extreme ultraviolet (EUV) emissions from the noon-midnight polar-orbiting Space Test Program (STP) 78-1 satellite are used to investigate the spectral features of the dayside auroral oval, nightside auroral oval, and the dayglow. The purpose of this study is to evaluate the possibility of using EUV atmospheric emissions for global auroral imaging and to study the temporal variations of the auroral EUV intensity with geomagnetic activity. It is found that during geomagnetically quiet times, O II 834 A, O I 989 A, and N2 1009 A measurements can provide a clear distinction of the auroral oval above the dayglow background. During the very active period, five other EUV emissions can give good aurora-to-dayglow ratios. The auroral EUV emissions are more intense during magnetospheric substorms; however, a clear one-to-one relationship between them was not found. It is also found that the auroral oval brightness, especially the noonside, increased during the initial phase of a geomagnetic storm. Thus, the sudden solar wind dynamic pressure enhancement is another important geophysical parameter that affects the EUV auroral emission.

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