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Intercalibration of the Plasma Density Measurements in Earth's Topside Ionosphere

Smirnov, Artem and Shprits, Yuri and Zhelavskaya, Irina and Lühr, Hermann and Xiong, Chao and Goss, Andreas and Prol, Fabricio S. and Schmidt, Michael and Hoque, Mainul and Pedatella, Nicholas and Szabó-Roberts, Mátyás (2021) Intercalibration of the Plasma Density Measurements in Earth's Topside Ionosphere. Journal of Geophysical Research: Space Physics. Wiley. doi: 10.1029/2021JA029334. ISSN 2169-9380.

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Official URL: https://doi. org/10.1029/2021JA029334


Over the last 20 years, a large number of instruments have provided plasma density measurements in Earth's topside ionosphere. To utilize all of the collected observations for empirical modeling, it is necessary to ensure that they do not exhibit systematic differences and are adjusted to the same reference frame. In this study, we compare satellite plasma density observations from Gravity Recovery and Climate Experiment (GRACE), Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC), CHAllenging Minisatellite Payload (CHAMP), Swarm, and Communications/Navigation Outage Forecasting System (C/NOFS) missions. Electron densities retrieved from GRACE K-Band Ranging (KBR) system, previously shown to be in excellent agreement with incoherent scatter radar (ISR) measurements, are used as a reference. We find that COSMIC radio occultation (RO) densities are highly consistent with GRACE-KBR observations showing a mean relative difference of < E 2%, and therefore no calibration factors between them are necessary. We utilize the outstanding three-dimensional coverage of the topside ionosphere by the COSMIC mission to perform conjunction analysis with in situ density observations from CHAMP, C/NOFS, and Swarm missions. CHAMP measurements are lower than COSMIC by E ∼11%. Swarm densities are generally lower at daytime and higher at nighttime compared to COSMIC. C/NOFS ion densities agree well with COSMIC, with a relative bias of E ∼7%. The resulting cross-calibration factors, derived from the probability distribution functions, help to eliminate the systematic leveling differences between the data sets, and allow using these data jointly in a large number of ionospheric applications.

Item URL in elib:https://elib.dlr.de/148772/
Document Type:Article
Title:Intercalibration of the Plasma Density Measurements in Earth's Topside Ionosphere
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Smirnov, ArtemUNSPECIFIEDhttps://orcid.org/0000-0003-3689-4336UNSPECIFIED
Shprits, YuriUNSPECIFIEDhttps://orcid.org/0000-0002-9625-0834UNSPECIFIED
Zhelavskaya, IrinaUNSPECIFIEDhttps://orcid.org/0000-0002-7029-5372UNSPECIFIED
Lühr, HermannUNSPECIFIEDhttps://orcid.org/0000-0002-1599-6758UNSPECIFIED
Xiong, ChaoUNSPECIFIEDhttps://orcid.org/0000-0002-7518-9368UNSPECIFIED
Goss, AndreasUNSPECIFIEDhttps://orcid.org/0000-0001-6780-268XUNSPECIFIED
Prol, Fabricio S.UNSPECIFIEDhttps://orcid.org/0000-0002-7206-1705UNSPECIFIED
Date:12 September 2021
Journal or Publication Title:Journal of Geophysical Research: Space Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:plasma density, in-situ, Intercalibration factors
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication, Navigation, Quantum Technology
DLR - Research area:Raumfahrt
DLR - Program:R KNQ - Communication, Navigation, Quantum Technology
DLR - Research theme (Project):R - Ionosphere
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Observation
Deposited By: Hoque, Mohammed Mainul
Deposited On:31 Oct 2022 17:58
Last Modified:05 Dec 2023 07:35

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