Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3124804y&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 24, CiteID L24804
Physics
13
Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Irregularities, Radio Science: Remote Sensing
Scientific paper
The relationship between sunset terminators and the onset of radar backscatter plumes associated with equatorial spread F (ESF) observed with the 47-MHz Equatorial Atmosphere Radar from October 2002 to April 2004 is discussed. Almost all irregularity echoes began to appear at or before sunset time at the altitude of the apex of the geomagnetic field line connected with the observed area, and the onset time of more than half of the events corresponded exactly to apex sunset time. This tendency should be due to two causes: (1) the rapid change of the evening zonal electric field and (2) damping of 3-m scale irregularities by the solar radiation before the apex sunset.
Fukao Shoichiro
Yamamoto Masayoshi
Yokoyama Tadashi
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