Precursor to equatorial spread-F in OI 630.0 nm dayglow

Details Precursor to equatorial spread-F in OI 630.0 nm dayglow Precursor to equatorial spread-F in OI 630.0 nm dayglow

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2797s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2797-2800

Physics

36

Anomalies, Atmospheric Ionization, Dayglow, Earth Ionosphere, Equatorial Atmosphere, Ionosondes, Spectral Emission, Spread F, All Sky Photography, Cameras, Diurnal Variations, Periodic Variations, Photometers, Radar Measurement

Scientific paper

A unique of OI 630.0 nm dayglow photometer operated from Waltair (10.0 deg N dip lat.), a-low-latitude station in India, in a bidirectional mode, i.e., over zenith and at 200 deg elevation pointing north, has revealed features associated with the evolution of the Equatorial Ionization Anomaly (EIA). The estimated strength of the EIA on a particular day based on these features reveal that significant differences exist in the EIA contribution of OI 630.0 nm on equatorial spread-F (ESF) and non-ESF days. There exists a precursor in the OI 630.0 nm dayglow which enables the prediction of ESF at least 3 hours prior to its actual occurrence and hence points to the significant control of daytime EIA-related processes uin the triggering of the post-sunset ESF.

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