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Thermosphere densities derived from Swarm GPS observations

van den IJssel, Jose and Doornbos, Eelco and Iorfida, Elisabetta and March, Günther and Siemes, Christian and Montenbruck, Oliver (2020) Thermosphere densities derived from Swarm GPS observations. Advances in Space Research, 65 (7), pp. 1758-1771. Elsevier. DOI: 10.1016/j.asr.2020.01.004 ISSN 0273-1177

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After the detection of many anomalies in the Swarm accelerometer data, an alternative method has been developed to determine thermospheric densities for the three-satellite mission. Using a precise orbit determination approach, non-gravitational and aerodynamiconly accelerations are estimated from the high-quality Swarm GPS data. The GPS-derived non-gravitational accelerations serve as a baseline for the correction of the Swarm-C along-track accelerometer data. The aerodynamic accelerations are converted directly into thermospheric densities for all Swarm satellites, albeit at a much lower temporal resolution than the accelerometers would have been able to deliver. The resulting density and acceleration data sets are part of the European Space Agency Level 2 Swarm products. To improve the Swarm densities, two modifications have recently been added to our original processing scheme. They consist of a more refined handling of radiation pressure accelerations and the use of a high-fidelity satellite geometry and improved aerodynamic model. These modifications lead to a better agreement between estimated Swarm densities and NRLMSISE-00 model densities. The GPS-derived Swarm densities show variations due to solar and geomagnetic activity, as well as seasonal, latitudinal and diurnal variations. For low solar activity, however, the aerodynamic signal experienced by the Swarm satellites is very small, and therefore it is more difficult to accurately resolve latitudinal density variability using GPS data, especially for the higher-flying Swarm-B satellite. Therefore, mean orbit densities are also included in the Swarm density product.

Item URL in elib:https://elib.dlr.de/134337/
Document Type:Article
Title:Thermosphere densities derived from Swarm GPS observations
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
van den IJssel, JoseTU DelftUNSPECIFIED
Iorfida, ElisabettaTU DelftUNSPECIFIED
March, GüntherTU DelftUNSPECIFIED
Siemes, ChristianTU Delfthttps://orcid.org/0000-0001-8316-1130
Montenbruck, OliverDLR/GSOChttps://orcid.org/0000-0003-4783-745X
Journal or Publication Title:Advances in Space Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.asr.2020.01.004
Page Range:pp. 1758-1771
Keywords:Swarm; GPS; Thermosphere density
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Technik für Raumfahrtsysteme
DLR - Research theme (Project):R - Vorhaben Infrastruktur und Unterstützung für Raumflugbetrieb
Location: Oberpfaffenhofen
Institutes and Institutions:Space Operations and Astronaut Training
Deposited By: Montenbruck, Dr.rer.nat.hab. Oliver
Deposited On:05 Mar 2020 17:33
Last Modified:05 Mar 2020 17:33

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