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Ionosphere/Plasmasphere Imaging Based on GPS Navigation Measurements from CHAMP and SAC-C

Heise, S. and Jakowski, N. and Cooke, D. and Reigber, Ch. (2003) Ionosphere/Plasmasphere Imaging Based on GPS Navigation Measurements from CHAMP and SAC-C. In: Proceedings Second CHAMP Science Meeting. Second CHAMP Science Meeting, Potsdam, Sep 1-4, 2003..

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Abstract

Ground based GPS measurements are well proved as a powerful tool to monitor the vertical Total Electron Content (TEC) of the ionosphere. The installation of GPS receivers on board of LEO (Low Earth Orbiting) satellites such as CHAMP and SAC-C offers new opportunities of ionospheric remote sensing. Beside the GPS radio occultation measurements both satellites CHAMP and SAC-C are using a dedicated zenith looking antenna to track permanently several GPS satellites for precise orbit determination. These 0.1 Hz sampled navigation measurements provide valuable information on the ionization state of the upper ionosphere and plasmasphere up to GPS altitude on global scale. After preprocessing and calibration, link related TEC measurements are derived from the GPS navigation observations. The three dimensional electron density distribution is reconstructed by assimilating these TEC measurements into the Parameterized Ionospheric Model (PIM) which includes also the Gallagher model of the plasmasphere. Due to the orbit properties of CHAMP and SAC-C there are periods when both satellites circle the earth at nearly the same orbit plane but at different altitudes. We will focus on these constellations which are of special interest for the combined assimilation of TEC measurements from both satellites. In this talk reconstruction results are presented for selected assimilation examples by means of two dimensional slices along the respective CHAMP/SAC-C orbit plane. The assimilation technique will be described briefly. Validation results using electron density measurements from the Langmuir Probe on board CHAMP will be presented.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:Ionosphere/Plasmasphere Imaging Based on GPS Navigation Measurements from CHAMP and SAC-C
Authors:
AuthorsInstitution or Email of Authors
Heise, S.GeoForschungsZentrum Potsdam
Jakowski, N.UNSPECIFIED
Cooke, D.Air Force Research Laboratory, Hanscom AFB, USA
Reigber, Ch.GeoForschungsZentrum Potsdam
Date:2003
Journal or Publication Title:Proceedings Second CHAMP Science Meeting
Status:Published
Keywords:Ionosphere, Plasmasphere, Imaging, GPS, CHAMP, SAC-C
Event Title:Second CHAMP Science Meeting, Potsdam, Sep 1-4, 2003.
Organizer:GeoForschungsZentrum (GFZ) Potsdam
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
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 21:29

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