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Validation of plasmasphere electron density reconstructions derived from data on board CHAMP by IMAGE/RPI data

Gerzen, Tatjana and Feltens, J. and Jakowski, N. and Galkin, I. and Denton, R. and Reinisch, B.W. and Zandbergen, R. (2014) Validation of plasmasphere electron density reconstructions derived from data on board CHAMP by IMAGE/RPI data. Advances in Space Research. Elsevier. DOI: DOI: 10.1016/j.asr.2014.08.005 ISSN 0273-1177

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Official URL: http://www.sciencedirect.com/science/article/pii/S0273117714005018

Abstract

Plasmaspheric electron content is, beyond the ionosphere as major source, a significant contributor to the overall TEC budget affecting GNSS signals. The plasmasphere can induce half or more of the GNSS range errors caused by atmospheric electrical charges, in particular at nighttime. At DLR Neustrelitz, Germany, GPS measurements recorded onboard the LEO satellite CHAMP were used to reconstruct the topside electron density distribution (ionosphere & plasmasphere) up to GPS altitude, applying a model-based assimilation technique. In this paper, the potential of these CHAMP topside reconstructions for analyzing space weather related changes in the geo-plasma is investigated. For this purpose, comparisons are made between the CHAMP reconstructed profiles and electron densities derived from passive radio wave observations by the IMAGE RPI instrument for years 2001 till 2005. The comparison results indicate that an improvement, compared to the electron density of a background model, can be achieved by CHAMP data assimilation. The improvement is especially visible in the L-shell region below 3, which contributes notably to the GNSS signal delays. However, for the region around the plasmapause, systematical electron density underestimations of the background model w.r.t. the IMAGE data are detected. The rather limited CHAMP data coverage and the degraded observation geometry at these high altitudes seem to be not sufficient for complete compensation of this underestimation during the assimilation procedure. The results presented in this paper demonstrate the strengths of LEO TEC data assimilation, but at the same time illustrate the necessity to improve the modelling of the plasmasphere region above 4 ER L-shell distances. Furthermore, they reveal the need of additional data to establish an appropriate data base for the modelling of the complete plasmasphere.

Item URL in elib:https://elib.dlr.de/90281/
Document Type:Article
Title:Validation of plasmasphere electron density reconstructions derived from data on board CHAMP by IMAGE/RPI data
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gerzen, Tatjanatatjana.gerzen (at) dlr.deUNSPECIFIED
Feltens, J.UNSPECIFIEDUNSPECIFIED
Jakowski, N.UNSPECIFIEDUNSPECIFIED
Galkin, I.Center for Atmospheric Research, LowellUNSPECIFIED
Denton, R.UNSPECIFIEDUNSPECIFIED
Reinisch, B.W.University of Massachusetts, USAUNSPECIFIED
Zandbergen, R.ESOCUNSPECIFIED
Date:August 2014
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :DOI: 10.1016/j.asr.2014.08.005
Publisher:Elsevier
ISSN:0273-1177
Status:Published
Keywords:Plasmasphere, Ionosphere, Reconstruction, Data Assimilation, LEO, CHAMP, IMAGE, Validation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben Ionosphäre
Location: Neustrelitz
Institutes and Institutions:Institute of Communication and Navigation > Navigation
Deposited By: Gerzen, Tatjana
Deposited On:18 Aug 2014 09:45
Last Modified:06 Sep 2019 15:27

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