Statistics – Applications
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa34a..08s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA34A-08
Statistics
Applications
[2400] Ionosphere, [2437] Ionosphere / Ionospheric Dynamics, [2443] Ionosphere / Midlatitude Ionosphere, [2467] Ionosphere / Plasma Temperature And Density
Scientific paper
Over the last several years of ionospheric studies, there was an interest in description and characterisation of the Earth`s topside ionosphere in global scales and in different time domains. Numerous observations and model studies have unequivocally revealed that the ionosphere and thermosphere owe a considerable amount of their longitudinal, local time, seasonal latitudinal and daily variability. Probably the most prominent longitudinal feature is the four-peaked longitudinal structure, commonly known as wave-4. Recently, vast range of studies on W4 has been performed with an application of various satellites (TOPEX, DMSP, COSMIC, TIMED and CHAMP), and mainly has been oriented on electron concentration. Making use of nearly 6 years permanent registrations of french satellite DEMETER, we have performed multi-instrumental studies of bulk plasma parameters, in order to find out whether similar features can be also assigned to global distribution of other plasma parameters. Performed analysis depict that for monthly averaged data for electron and ion temperatures, magnetic field aligned structures are evident. For equatorial topside ionosphere we have observed three remarkable "cold spots" for electron temperature. In the morning hours (10:30 am LT) the minima occupy narrow zones around 50W, 100E, 175W, and tend to expand polewards with increasing ionisation during the day. In case of ions, temperature morphology seems to be more complex, and apart from longitudinal behaviour, we have observed somewhat hemispheric seasonal tendency. Obtained results are useful for better understanding some issues concerning topside ionospheric dynamics. It also provides rich and helpful material for all types of space weather applications.
Rothkaehl Hanna
Slominska E.
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