Characteristics of ionospheric bubbles determined from aspect sensitive scatter spread F observed with Alouette 1

Details Characteristics of ionospheric bubbles determined from aspect sensitive scatter spread F observed with Alouette 1 Characteristics of ionospheric bubbles determined from aspect sensitive scatter spread F observed with Alouette 1

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2115m&link_type=abstract

Journal of Geophysical Research, vol. 85, May 1, 1980, p. 2115-2123.

Computer Science

Sound

4

Bubbles, Equatorial Atmosphere, Ionospheric F-Scatter Propagation, Satellite Sounding, Spread F, Alouette 1 Satellite, Annual Variations, Data Processing, Diurnal Variations, Field Aligned Currents, Ionograms, Ray Tracing

Scientific paper

Aspect sensitive scatter from bubbles is observed on equatorial Alouette 1 ionograms. The occurrence frequency of bubbles increases sharply from zero after sunset and reaches a maximum at about 23-24 hr local time, then decreases gradually throughout the postmidnight and morning periods and becomes almost zero near noon. The bubbles rise to a maximum height of about 600-1000 km near midnight, which height decreases gradually until some time after sunrise. It is noted that the occurrence of bubbles peaks at the December solstice for American longitudes and at the June solstice for Asian longitudes. The observations imply that bubbles are initiated by field-aligned currents at the steep density gradient at the bottom of the postsunset F layer by the mechanism proposed by Cole (1971). In addition, a particular, but typical, bubble was studied by ray tracing and shown to be about 28 km in radius.

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