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Comparison of Ionospheric ionization measurements over Athens using ground ionosonde and GPS derived TEC values

Belehaki, A. and Jakowski, N. and Reinisch, B. (2003) Comparison of Ionospheric ionization measurements over Athens using ground ionosonde and GPS derived TEC values. Radio Science, 38 (6 (DOI 10. 1 029/2003RS002868)).

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Abstract

GPS-derived TEC measurements (GPSTEC) represent the electron content up to 20,000 km, while a new ionosonde technique estimates the ionospheric electron content (ITEC) from ground ionosondes from the bottom of the ionosphere through the peak up to 1000 km. The two independent techniques were applied to determine ITEC and GPSTEC for Athens (38°N, 23.5°E) using the vertical Digisonde observations at Athens and GPSTEC maps produced by DLR/IKN for Europe using GPS measurements. Comparison of the two quantities over a 12-month time period shows a general agreement at daytime and a systematic deviation of ITEC towards lower values during nighttime. The diurnal variation of their residual values (ÄTEC) exhibits a morning minimum and an evening maximum, which can be explained in terms of ionospheric-plasmaspheric ionization exchange. The prominent evening enhancement, observed in all seasons around 1800–2000 LT, is attributed to the plasmaspheric bulge. The application of the superposed epoch analysis method on the daily ÄTEC values for several geomagnetic storms showed a rapid decrease of ÄTEC just after the storm initiation and a consecutive increase over a time period of 9 days, a behavior that is consistent with the plasmaspheric depletion and successive replenishment following storm activity. The daily variation of the ionospheric slab thickness is compatible with the variation of the thermospheric temperature within a day. Concerning the total slab thickness, this behavior is altered by the nighttime increase, which is most prominent in winter, and it is due to the lowering of the O+/H+ transition height. In summary, this analysis presents additional proof that the residuals ÄTEC = GPSTEC ITEC provide information about the qualitative characteristics of the plasmaspheric dynamics as deduced from their diurnal behavior and their variation during geomagnetic storms.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:Comparison of Ionospheric ionization measurements over Athens using ground ionosonde and GPS derived TEC values
Authors:
AuthorsInstitution or Email of Authors
Belehaki, A.National Observatory of Athens, Greece
Jakowski, N.UNSPECIFIED
Reinisch, B.University of Massachusetts, USA
Date:2003
Journal or Publication Title:Radio Science
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:38
Status:Published
Keywords:Ionosphere, Ionization, GPS, TEC Values
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W KN - Kommunikation/Navigation
DLR - Research area:Space
DLR - Program:W KN - Kommunikation/Navigation
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:06 Jan 2010 21:27

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