Computer Science – Sound
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85..613m&link_type=abstract
Journal of Geophysical Research, vol. 85, Feb. 1, 1980, p. 613-625.
Computer Science
Sound
8
Atmospheric Electricity, Electric Current, Field Aligned Currents, Magnetospheric Instability, Satellite Sounding, Spread F, E Region, F Region, Ionograms, Ionospheric Disturbances, Plasma-Electromagnetic Interaction, Tropical Regions
Scientific paper
Topside sounder ionograms reveal that magnetospheric ducts for medium frequency (MF) radio waves are formed, for L greater than about 1.2, between about 20 and 22 hours local time, and that for L less than about 1.2, the percentage occurrence of MF ducts increases from about 20 to 02 hours. These ducts are thought to be associated with ionospheric bubbles. The seasonal and longitudinal variation of the ducts and of low-latitude spread F implies that both are related to hemispheric asymmetry of the winds in the dynamo region and hence are probably generated by field-aligned currents. These currents generate significant irregularities in the E region of the ionosphere at night, which in turn produce perpendicular electric fields due to winds.
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