Global/Seasonal/Local-Time Variations of Ion Density Structure at Low-Latitude Ionosphere and Their Relationship to the Post-Sunset Irregularity Occurrences

Details Global/Seasonal/Local-Time Variations of Ion Density Structure at Low-Latitude Ionosphere and Their Relationship to the Post-Sunset Irregularity Occurrences Global/Seasonal/Local-Time Variations of Ion Density Structure at Low-Latitude Ionosphere and Their Relationship to the Post-Sunset Irregularity Occurrences

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa11a1494s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA11A-1494

Other

2415 Equatorial Ionosphere, 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2481 Topside Ionosphere

Scientific paper

Seasonal and longitudinal (s/l) variations of ion density structure at the 600-km low-latitude ionosphere observed by ROCSAT-1 between two similar solar activity years of 2000 and 2002 are examined at five different local-time (LT) sectors. The gross feature in the s/l variations of density structure is very similar to each other for these two years. A reproducibility of density structure can thus be assumed, including the shape of equatorial ionization anomaly (EIA) structure, for similar solar flux input. It is further noted that model result from either the 2006 International Reference Ionosphere (IRI) model or the thermosphere ionosphere electrodynamics general circulation model (TIEGCM) cannot reproduce the ROCSAT observed global/seasonal/local-time variations of ionospheric structure. Furthermore, the ROCSAT observed s/l variations of crest-to-trough ratio in the EIA structure fail to correlate with the s/l variations of the post-sunset irregularity occurrence rates because the magnetic declination effect that determines the post-sunset ionospheric conductivity for the ionospheric electrodynamics are not included in such s/l variations of ionospheric background density structure.

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