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Improving estimates of the ionosphere during geomagnetic storm conditions through assimilation of thermospheric mass density

Fernandez Gomez, Isabel and Kodikara, Timothy and Borries, Claudia and Forootan, Ehsan and Goss, Andreas and Schmidt, Michael and Codrescu, Mihail (2022) Improving estimates of the ionosphere during geomagnetic storm conditions through assimilation of thermospheric mass density. Earth, Planets and Space, 74 (121). Springer. doi: 10.1186/s40623-022-01678-3. ISSN 1343-8832.

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Official URL: https://rdcu.be/cTaHA

Abstract

Dynamical changes in the ionosphere and thermosphere during geomagnetic storm times can have a significant impact on our communication and navigation applications, as well as satellite orbit determination and prediction activities. Because of the complex electrodynamics coupling processes during storms, which cannot be fully described with the sparse set of thermosphere–ionosphere (TI) observations, it is crucial to accurately model the state of the TI system. The approximation closest to the true state can be obtained by assimilating relevant measurements into physics-based models. Thermospheric mass density (TMD) derived from satellite measurements is ideal to improve the thermosphere through data assimilation. Given the coupled nature of the TI system, the changes in the thermosphere will also influence the ionosphere state. This study presents a quantification of the changes and improvement of the model state produced by assimilating TMD not only for the thermosphere density but also for the ionosphere electron density under storm conditions. TMD estimates derived from a single Swarm satellite and the Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) physics-based model are used for the data assimilation. The results are presented for a case study during the St. Patricks Day storm 2015. It is shown that the TMD data assimilation generates an improvement of the model’s thermosphere density of up to 40% (measured along the orbit of the non-assimilated Swarm satellites). The model’s electron density during the course of the storm has been improved by approximately 8 and 22% relative to Swarm-A and GRACE, respectively. The comparison of the model’s global electron density against a high-quality 3D electron density model, generated through assimilation of total electron content, shows that TMD assimilation modifies the model’s ionosphere state positively and negatively during storm time. The major improvement areas are the mid-low latitudes during the storm’s recovery phase.

Item URL in elib:https://elib.dlr.de/187832/
Document Type:Article
Additional Information:This work was supported by the Insight II project from the German Research Foundation (DFG) with grant number BO 5011/2-2
Title:Improving estimates of the ionosphere during geomagnetic storm conditions through assimilation of thermospheric mass density
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Fernandez Gomez, IsabelUNSPECIFIEDhttps://orcid.org/0000-0001-7623-9219UNSPECIFIED
Kodikara, TimothyUNSPECIFIEDhttps://orcid.org/0000-0003-4099-9966UNSPECIFIED
Borries, ClaudiaUNSPECIFIEDhttps://orcid.org/0000-0001-9948-3353UNSPECIFIED
Forootan, EhsanUNSPECIFIEDhttps://orcid.org/0000-0003-3055-041XUNSPECIFIED
Goss, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmidt, MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Codrescu, MihailSWPC, NOAA, Boulderhttps://orcid.org/0000-0001-7216-9858UNSPECIFIED
Date:6 August 2022
Journal or Publication Title:Earth, Planets and Space
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:74
DOI:10.1186/s40623-022-01678-3
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
Stole, ClaudiaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Publisher:Springer
Series Name:DynamicEarth: Earth's Interior, Surface, Ocean, Atmosphere, and Near Space Interactions
ISSN:1343-8832
Status:Published
Keywords:Data assimilation, Geomagnetic storm, Neutral density, Thermosphere - Ionosphere system
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Solar-Terrestrial Physics SO
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Solar-Terrestrial Coupling Processes
Deposited By: Fernandez Gomez, PhD. Isabel
Deposited On:29 Aug 2022 09:18
Last Modified:23 Sep 2022 04:14

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