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Using Data Assimilation to Understand the Systematic Errors in CHAMP Accelerometer-Derived Neutral Mass Density Data

Kodikara, Timothy and Fernandez-Gomez, Isabel and Forootan, Ehsan and Tobiska, W. Kent and Borries, Claudia (2022) Using Data Assimilation to Understand the Systematic Errors in CHAMP Accelerometer-Derived Neutral Mass Density Data. Earth and Space Science Open Archive. SPP Dynamic Earth Final Colloquium, 31 May - 02 Jun 2022, Kühlungsborn, Germany.

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Accelerometer-derived neutral mass density (NMD) is an important quantity that describes the variability of the upper atmosphere. NMD is widely used to calibrate and validate some models used for satellite orbit determination and prediction. Quantifying the true NMD is nearly impossible due to, among others, the lack of simultaneous in-situ measurements to cross-validate and the incomplete characterization of the uncertainties of these NMD products. Using multiple data assimilation (DA) experiments and robust statistical techniques, this study investigates the error distribution of three different accelerometer-derived NMD products from the CHAMP satellite mission during a time period of low solar and geomagnetic activities. The strategies applied here may be useful and applicable to other space missions spanning over longer time periods. The results indicate considerable differences among the three CHAMP data sets and also show a pronounced latitudinal dependency for the estimated error distributions. On average, the error estimates for NMD vary in the range 6.5-15.6% of the signal. The results further demonstrate that DA considerably enhances the capability of the physical model as well as an excellent tool to assess data uncertainties.

Item URL in elib:https://elib.dlr.de/186679/
Document Type:Conference or Workshop Item (Poster)
Title:Using Data Assimilation to Understand the Systematic Errors in CHAMP Accelerometer-Derived Neutral Mass Density Data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kodikara, TimothyUNSPECIFIEDhttps://orcid.org/0000-0003-4099-9966UNSPECIFIED
Fernandez-Gomez, IsabelUNSPECIFIEDhttps://orcid.org/0000-0001-7623-9219UNSPECIFIED
Forootan, EhsanUNSPECIFIEDhttps://orcid.org/0000-0003-3055-041XUNSPECIFIED
Tobiska, W. KentUNSPECIFIEDhttps://orcid.org/0000-0002-0415-8484UNSPECIFIED
Borries, ClaudiaUNSPECIFIEDhttps://orcid.org/0000-0001-9948-3353UNSPECIFIED
Date:31 May 2022
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Publisher:Earth and Space Science Open Archive
Keywords:thermosphere accelerometer-derived neutral mass density, ionosphere electron/plasma density and temperature, neutral winds, data assimilation, CHAMP, TIE-GCM, HASDM, JB2008, NRLMSIS, uncertainty estimation
Event Title:SPP Dynamic Earth Final Colloquium
Event Location:Kühlungsborn, Germany
Event Type:Workshop
Event Dates:31 May - 02 Jun 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: Kodikara, Dr Timothy
Deposited On:28 Jun 2022 11:00
Last Modified:28 Jun 2022 11:00

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