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| Titel |
WN4 effect on longitudinal distribution of different ion species in the topside ionosphere at low latitudes by means of DEMETER, DMSP-F13 and DMSP-F15 data |
| VerfasserIn |
L. Bankov, R. Heelis, M. Parrot, J.-J. Berthelier, P. Marinov, A. Vassileva |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 7 ; Nr. 27, no. 7 (2009-07-22), S.2893-2902 |
| Datensatznummer |
250016598
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| Publikation (Nr.) |
 copernicus.org/angeo-27-2893-2009.pdf |
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| Zusammenfassung |
| Plasma probe data from DMSP-F13, DMSP-F15 and DEMETER satellites
were used to examine longitudinal structures in the topside
equatorial ionosphere during fall equinox conditions of 2004 year.
Since the launch of DEMETER satellite on 29 June 2004, all these
satellites operate close together in the topside ionosphere. Here,
data taken from Special Sensor-Ion, Electron and
Scintillations (SSIES) instruments on board DMSP-F13, F15 and
Instrument Analyser de Plasma (IAP) on DEMETER,
are used. Longitudinal variations in the major ions at two altitudes
(~730 km for DEMETER and ~840 km for DMSP) are studied
to further describe the recently observed "wavenumber-four" (WN4)
structures in the equatorial topside ionosphere. Different ion
species H+, He+ and O+ have a rather complex longitudinal
behavior. It is shown that WN4 is almost a regular feature in O+
the density distribution over all local times covered by these
satellites. In the evening local time sector, H+ ions follow the O+
behavior within WN4 structures up to the pre-midnight hours. Near
sunrise H+ and later in the daytime, He+ longitudinal variations
are out of phase with respect to O+ ions and effectively reduce the
effect of WN4 on total ion density distribution at altitudes
730–840 km. It is shown that both a WN4 E×B drift driver and local F-region
winds must be considered to explain the observed ion composition variations. |
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