Topside Ionosphere Sounding From the CHAMP, GRACE, and GRACE-FO Missions

Topside Ionosphere Sounding From the CHAMP, GRACE, and GRACE-FO Missions

Schreiter, Lucas (Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences)
Stolle, Claudia (University of Rostock, Rostock)
Rauberg, Jan (Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences)
Kervalishvili, Guram (Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences)
van den IJssel, J.A.A. (TU Delft Astrodynamics & Space Missions)
Arnold, Daniel (University of Bern)
Xiong, Chao (Wuhan University)
Callegare, Andyara (University of Potsdam; Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences)

2023

Satellites in Low Earth Orbit (LEO) are essential for sounding the topside ionosphere. In this work, we present and validate a data set of Total Electron Content (TEC) and in situ electron density observations from the Gravity Recovery And Climate Experiment (GRACE) and GRACE-Follow-On missions as well as a TEC data set from the CHAllenging Minisatellite Payload mission. Concerning TEC, special emphasis is put to ensure optimal consistency to the already existing Swarm and Gravity field and steady-state ocean circulation explorer (GOCE) TEC data sets. The newly processed satellite missions allow covering two full solar cycles with LEO slant TEC. Furthermore, the twin satellite missions GRACE and GRACE-FO equipped with inter-satellite K-band ranging allows to derive the horizontal TEC and, due to the small inter-satellite distance of the satellite pairs, an approximation for local electron density. However, the derived value of electron density is relative and requires calibration using external information. In this work, the calibration is performed using the IRI-2016 model. Radar observations, as well as in situ electron density observations available from Swarm B Langmuir probes, are used for validation. Conjunctions between satellites are used to validate the TEC time series. The newly derived data set is shown to be highly consistent with the already existing data sets with standard deviations below 3 TECU for TEC (even 1 TECU was reached for low solar flux) and an offset below 7 × 10¹⁰ m⁻³ with a standard deviation near 1 × 10¹¹ m⁻³ for the electron density.

electron density
LEO satellites
radar calibration
topside ionosphere
total electron content

http://resolver.tudelft.nl/uuid:adf37b5a-474e-4de3-bba6-d10b635fdf03

https://doi.org/10.1029/2022RS007552

0048-6604

Radio Science, 58 (3)

Institutional Repository

journal article

© 2023 Lucas Schreiter, Claudia Stolle, Jan Rauberg, Guram Kervalishvili, J.A.A. van den IJssel, Daniel Arnold, Chao Xiong, Andyara Callegare