Other
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa23a1892b&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA23A-1892
Other
[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2443] Ionosphere / Midlatitude Ionosphere, [2467] Ionosphere / Plasma Temperature And Density
Scientific paper
In addition to the many dynamic features of the low latitude ionosphere such as scintillation and density depletions, the nighttime ionosphere also shows post-sunset density enhancements. This feature is similar to the enhancements observed in neutral temperature and density known as the midnight temperature maximum (MTM) and midnight density maximum (MDM) [e.g. Akmaev et al, 2010]. Because the thermosphere and ionosphere are coupled, it is likely that any enhancement in one should produce an effect in the other region. The focus of this study is to investigate whether an enhancement in nighttime plasma density at low- and mid-latitudes (+40°) exists. A nighttime ionosphere density enhancement is also referred to as a midnight density maximum (MDM). MDM is investigated using GPS occultation data retrieved from the C/NOFS Occultation Receiver for Ionospheric Sensing and Specification (CORISS). By looking at both total electron content (TEC) and electron density profiles we are able to characterize MDM events and provide identifying markers. The selected dataset used in the study encompasses September 2009 to April 2010 over all longitudes. We find that MDM events occur independently of geomagnetic activity. We also discuss our results in relation to the known behavior of MTM and compare our results to previously reported findings by Luan et al. [2008]. Akmaev et al., J. Geophys. Res., 115, doi:10.1029/2010JA015651, 2010. Luan et al., J. Geophys. Res., 113, doi:10.1029/2008JA013063, 2008.
Bishop Richard L.
Brubaker T. R.
Straus Paul R.
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