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Improving the ionospheric state estimate during geomagnetic storm time through assimilation of neutral density data

Fernandez-Gomez, Isabel and Kodikara, Timothy and Borries, Claudia and Forootan, Ehsan and Schmidt, Michael and Codrescu, Mihail (2022) Improving the ionospheric state estimate during geomagnetic storm time through assimilation of neutral density data. EGU General Assembly 2022, 23-27 May 2022, Vienna, Austria. doi: 10.5194/egusphere-egu22-9517.

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Abstract

During geomagnetic storms, communication and navigation instruments can be dramatically affected by the rapid changes that occur in the upper atmosphere. The assimilation of data in physics-based models such as the Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) model through and ensemble Kalman filter, can improve the representation of the thermosphere-ionosphere (TI) system. Due to the coupled nature of the TI system, the ionosphere is affected by, among others, changes in the neutral atmosphere. In this study, we investigate the capability of the CTIPe model to provide better estimates of the ionosphere by improving its specification of the thermosphere via data assimilation. Here, we assimilate thermospheric mass density (TMD) observations from the Swarm mission normalized to 400 km altitude during the 2015 St. Patrick’s Day storm. The changes that occur in the ionosphere due to assimilation of TMD data are measured by means of the difference between the model results with and without assimilation. To measure the improvement gained with data assimilation, we compare with independent measurements of electron density along the orbit of GRACE (Gravity Recovery and Climate Experiment) satellite, that shows a reduction in the root mean square error (RMSE) by a 22% with respect to the non-assimilation run. The impact on the global scale is measured by comparing the CTIPe model results with the corresponding output of the 3D B-Spline electron density model. The results illustrate that the electron density equatorial region is the most affected region by assimilation of TMD, with an average RMSE reduction of 25% at the assimilation altitude of 400 km.

Item URL in elib:https://elib.dlr.de/186858/
Document Type:Conference or Workshop Item (Speech)
Title:Improving the ionospheric state estimate during geomagnetic storm time through assimilation of neutral density data
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Fernandez-Gomez, IsabelIsabel.FernandezGomez (at) dlr.dehttps://orcid.org/0000-0001-7623-9219
Kodikara, TimothyTimothy.Kodikara (at) dlr.dehttps://orcid.org/0000-0003-4099-9966
Borries, Claudiaclaudia.borries (at) dlr.dehttps://orcid.org/0000-0001-9948-3353
Forootan, EhsanAalborg UniversityUNSPECIFIED
Schmidt, MichaelTechnical University MunichUNSPECIFIED
Codrescu, MihailSWPC, NOAA, Boulderhttps://orcid.org/0000-0001-7216-9858
Date:23 May 2022
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.5194/egusphere-egu22-9517
Status:Published
Keywords:Data assimilation, thermosphere-ionosphere system, neutral density, geomagnetic storm
Event Title:EGU General Assembly 2022
Event Location:Vienna, Austria
Event Type:international Conference
Event Dates:23-27 May 2022
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:28 Jun 2022 11:01
Last Modified:28 Jun 2022 11:01

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