Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3820102t&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 20, CiteID L20102
Physics
1
Ionosphere: Equatorial Ionosphere, Ionosphere: Ionospheric Disturbances, Ionosphere: Ionospheric Irregularities
Scientific paper
Understanding the day-to-day variability in occurrence of equatorial spread F (ESF) remains as a high-priority objective in space weather research. A major difficulty has been an inability to resolve the roles being played by large-scale wave structure (LSWS) and the post-sunset rise (PSSR) of the equatorial F layer, in the production of ESF. In this paper, we show conclusively that total electron content (TEC), measured as a function of latitude and longitude, provides clear, routine descriptions of LSWS. Then, together with ionosonde data, we show, for the first time, that while a seed for LSWS can occur in the late afternoon, its amplification takes place mostly during the PSSR. Implications of these findings are discussed in light of existing theories.
Chau Ha Duyen
Hoang Thai Lan
Nagatsuma Tsutomu
Thampi Smitha V.
Tsugawa Takuya
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