Post-midnight low-latitude ionospheric irregularities during solar minimum observed simultaneously with probes on the C/NOFS satellite and the Equatorial Atmosphere Radar

Details Post-midnight low-latitude ionospheric irregularities during solar minimum observed simultaneously with probes on the C/NOFS satellite and the Equatorial Atmosphere Radar Post-midnight low-latitude ionospheric irregularities during solar minimum observed simultaneously with probes on the C/NOFS satellite and the Equatorial Atmosphere Radar

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa51b1627y&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA51B-1627

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities, [2494] Ionosphere / Instruments And Techniques

Scientific paper

Since the launch of Communication/Navigation Outage Forecasting System (C/NOFS) satellite, post-midnight plasma density irregularities have frequently been detected in the low-latitude region during the present solar minimum period. Using the 47-MHz Equatorial Atmosphere Radar (EAR) in West Sumatra, Indonesia (10.36oS dip latitude), it is shown that the post-midnight irregularities observed with the EAR are different from standard irregularities typically observed near the magnetic equator but instead, are quite similar to those observed with the MU radar in midlatitude (29.3oN dip latitude). Utilizing rapid beam-steering capability of the EAR, it is found that their tilted spatial structures are the same as medium-scale traveling ionospheric disturbances (MSTIDs) which are frequently observed in midlatitude, and they usually propagate westward as opposed to typical plasma depletions that propagate eastward observed in the post-sunset period, for example during solar maximum. The zonal and meridional E × B drift velocities measured by C/NOFS are consistent with the westward propagation of backscatter echoes and the line-of-sight Doppler velocities observed with the EAR, respectively. The density structures and EAR echo intensity do not show a clear correlation, but some echoes are observed at the edge of density depletions, which may be a manifestation of a secondary E × B instability to produce 3-m scale irregularities. During solar minimum, the nighttime zonal drift could be reversed from eastward to westward with increasing altitude because of very low Pedersen conductivity in the F region, which could explain the high occurrence of midlatitude-type irregularities in the low-latitude region which is connected with the topside equatorial ionosphere.

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