Statistical analysis of nighttime MSTIDs based on airglow imaging observations in the equatorial thermosphere

Details Statistical analysis of nighttime MSTIDs based on airglow imaging observations in the equatorial thermosphere Statistical analysis of nighttime MSTIDs based on airglow imaging observations in the equatorial thermosphere

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31a1702f&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA31A-1702

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2435] Ionosphere / Ionospheric Disturbances

Scientific paper

We study nighttime medium-scale travelling ionospheric disturbances (MSTIDs) observed at Kototabang (0.2S, 100.3E, geomagnetic latitude (MLAT): 10.6S), Indonesia during 7 years from 26 October 2002 to 25 October 2009. We took 630-nm night airglow images with exposure times of 105-165 s and time resolutions of 4.5-5.5 min by using a highly-sensitive all-sky airglow imager. The average and standard deviation of the horizontal phase velocity and period of the MSTIDs were 316.7, 166.0 m/s and 42.1, 10.5 min, respectively. In this observation during 7 years from solar maximum to minimum, the airglow emission became weaker and the observation rate of MSTIDs decreased year by year. This fact may suggest that the occurrence of MSTIDs actually decreases when the solar activity becomes weaker. However the decrease of the signal-to-noise ratio and the decline of the imager sensitivity must also affect this positive correlation. The previous study suggested that acoustic gravity waves in the thermosphere caused the observed MSTIDs, because the observed MSTIDs mostly had east-west phase fronts. In this study, we found positive correlation between the propagation directions of the observed MSTIDs and the location of tropospheric convection activity identified by hourly maps of equivalent black body temperature (TBB). In the presentation, we discuss detailed characteristics of the MSTIDs observed over 7 years in the context of dynamics of the equatorial thermosphere.

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