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Assessing a calibration and data assimilation technique for predicting multi-level global thermospheric neutral density fields

Forootan, Ehsan and Farzaneh, Saeed and Kosary, Mona and Borries, Claudia and Kodikara, Timothy and Doornbos, Eelco and Schumacher, Maike (2023) Assessing a calibration and data assimilation technique for predicting multi-level global thermospheric neutral density fields. EGU General Assembly 2023, 24–28 Apr 2023, Vienna, Austria. doi: 10.5194/egusphere-egu23-5804.

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Official URL: https://dx.doi.org/10.5194/egusphere-egu23-5804


An accurate estimation of the Thermospheric Neutral Density (TND) is important for predicting the orbit of satellites and objects, for example, those with the altitude of less than 1000 km. Models are often used to simulate TNDs but their accuracy is limited due to uncertainties. Satellite missions such as CHAMP, GRACE, GOCE, Swarm, and GRACE-FO or the Satellite Laser Ranging (SLR) missions can be used to estimate along-track TNDs. However, spatial and temporal coverage of these space borne TNDs is restricted to the mission design. To make the best use of the modelling tools and measurements, we applied these along-track TND measurements within the sequential Calibration and Data Assimilation (C/DA) framework proposed by (Forootan et al., 2022, doi:10.1038/s41598-022-05952-y). The C/DA is used to re-calibrate the NRLMSISE00 model, which is called “C/DA-NRLMSISE00”, whose outputs fit well to the introduced space-borne TNDs. The C/DA-NRLMSISE00 is applicable for forecasting TNDs and individual neutral mass compositions at any predefined vertical level (between ~100 and ~600 km) with user-defined spatial-temporal sampling. Seven periods (between 2003 - 2020) with considerable geomagnetic activity are selected for our investigations because most of the available models lack accuracy to provide reasonable TND simulations. Independent comparisons are performed with the space-borne TNDs that were not used within the C/DA framework, as well as with the outputs of other thermospheric models such as Jacchia-Bowman 2008 (JB2008) and the High Accuracy Satellite Drag Model (HASDM) database. The numerical results indicate that indeed the new model is suitable for producing multi-level global thermospheric neutral density fields.

Item URL in elib:https://elib.dlr.de/195789/
Document Type:Conference or Workshop Item (Speech)
Title:Assessing a calibration and data assimilation technique for predicting multi-level global thermospheric neutral density fields
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Forootan, EhsanUNSPECIFIEDhttps://orcid.org/0000-0003-3055-041XUNSPECIFIED
Farzaneh, SaeedUNSPECIFIEDhttps://orcid.org/0000-0002-0534-0632UNSPECIFIED
Borries, ClaudiaUNSPECIFIEDhttps://orcid.org/0000-0001-9948-3353UNSPECIFIED
Kodikara, TimothyUNSPECIFIEDhttps://orcid.org/0000-0003-4099-9966UNSPECIFIED
Doornbos, EelcoUNSPECIFIEDhttps://orcid.org/0000-0002-9790-8546UNSPECIFIED
Date:23 April 2023
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:data assimilation, thermosphere, neutral mass density
Event Title:EGU General Assembly 2023
Event Location:Vienna, Austria
Event Type:international Conference
Event Dates:24–28 Apr 2023
Organizer:European Geosciences Union
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
Deposited By: Kodikara, Dr Timothy
Deposited On:21 Aug 2023 15:40
Last Modified:21 Aug 2023 15:40

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