Thu Aug 14, F. Flechtner
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Forootan, E., Farzaneh, S., Kosary, M., Schmidt, M., and Schumacher, M., 2021. A simultaneous calibration and data assimilation (C/DA) to improve NRLMSISE00 using thermospheric neutral density (TND) from space-borne accelerometer measurements. Geophysical Journal International, 224(2):1096–1115, doi:10.1093/gji/ggaa507.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2021GeoJI.224.1096F,
author = {{Forootan}, E. and {Farzaneh}, S. and {Kosary}, M. and {Schmidt}, M. and {Schumacher}, M.},
title = "{A simultaneous calibration and data assimilation (C/DA) to improve NRLMSISE00 using thermospheric neutral density (TND) from space-borne accelerometer measurements}",
journal = {Geophysical Journal International},
keywords = {Satellite geodesy, Space geodetic surveys, Numerical modelling, Statistical methods},
year = 2021,
month = feb,
volume = {224},
number = {2},
pages = {1096-1115},
abstract = "{Improving thermospheric neutral density (TND) estimates is important for
computing drag forces acting on low-Earth-orbit (LEO) satellites
and debris. Empirical thermospheric models are often used to
compute TNDs for the precise orbit determination experiments.
However, it is known that simulating TNDs are of limited
accuracy due to simplification of model structure, coarse
sampling of model inputs and dependencies to the calibration
period. Here, we apply TND estimates from accelerometer
measurements of the Challenging Minisatellite Payload (CHAMP)
and the Gravity Recovery and Climate Experiment (GRACE) missions
as observations to improve the NRLMSISE-00 model, which belongs
to the mass spectrometer and incoherent scatter family of
models. For this, a novel simultaneous calibration and data
assimilation (C/DA) technique is implemented that uses the
ensemble Kalman filter and the ensemble square-root Kalman
filter as merger. The application of C/DA is unique because it
modifies both model-derived TNDs, as well as the selected model
parameters. The calibrated parameters derived from C/DA are then
used to predict TNDs in locations that are not covered by CHAMP
and GRACE orbits, and forecasting TNDs of the next day. The C/DA
is implemented using daily CHAMP- and/or GRACE-TNDs, for which
compared to the original model, we find 27 per cent and 62 per
cent reduction of misfit between model and observations in terms
of root mean square error and Nash coefficient, respectively.
These validations are performed using the observations along the
orbital track of the other satellite that is not used in the
C/DA during 2003 with various solar activity. Comparisons with
another empirical model, that is, Jacchia-Bowman, indicate that
the C/DA results improve these quality measurements on an
average range of 50 per cent and 60 per cent, respectively.}",
doi = {10.1093/gji/ggaa507},
adsurl = {https://ui.adsabs.harvard.edu/abs/2021GeoJI.224.1096F},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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