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A new empirical model of NmF2 based on CHAMP, 3 GRACE and COSMIC radio occultation

Liu, Zhendi and Fang, Hanxian and Hoque, Mohammed Mainul and Weng, Libin and Yang, Shenggao and Gao, Ze (2019) A new empirical model of NmF2 based on CHAMP, 3 GRACE and COSMIC radio occultation. Remote Sensing. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs11111386. ISSN 2072-4292.

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Official URL: https://www.mdpi.com/2072-4292/11/11/1386

Abstract

To facilitate F2-layer peak density (NmF2) modeling, a nonlinear polynomial model approach based on global NmF2 observational data from ionospheric radio occultation (IRO) measurements onboard the CHAMP, GRACE, and COSMIC satellites, is presented in this paper. We divided the globe into 63 slices from 80°S to 80°N according to geomagnetic latitude. A Nonlinear Polynomial Peak Density Model (NPPDM) was constructed by a multivariable least squares fitting to NmF2 measurements in each latitude slice and the dependencies of NmF2 on solar activity, geographical longitude, universal time, and day of year were described. The model was designed for quiet and moderate geomagnetic conditions (Ap ≤ 32). Using independent radio occultation data, quantitative analysis was made. The correlation coefficients between NPPDM predictions and IRO data were 0.91 in 2002 and 0.82 in 2005. The results show that NPPDM performs better than IRI2016 and Neustrelitz Peak Density Model (NPDM) under low solar activity, while it undergoes performance degradation under high solar activity. Using data from twelve ionosonde stations, the accuracy of NPPDM was found to be better than that of NPDM and comparable to that of IRI2016. Additionally, NPPDM can well simulate the variations and distributions of NmF2 and describe some ionospheric features, including the equatorial ionization anomaly, the mid-latitude trough, and the wavenumber-four longitudinal structure.

Item URL in elib:https://elib.dlr.de/133863/
Document Type:Article
Title:A new empirical model of NmF2 based on CHAMP, 3 GRACE and COSMIC radio occultation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Liu, ZhendiInstitute of Meteorology and Oceanography, National University of Defense Technology, NanjingUNSPECIFIED
Fang, HanxianInstitute of Meteorology and Oceanography, National University of Defense Technology, NanjingUNSPECIFIED
Hoque, Mohammed MainulMainul.Hoque (at) dlr.deUNSPECIFIED
Weng, LibinInstitute of Meteorology and Oceanography, National University of Defense Technology, NanjingUNSPECIFIED
Yang, ShenggaoState Key Laboratory of Astronautic Dynamics, Xi’an Satellite Control CenterUNSPECIFIED
Gao, ZeInstitute of Meteorology and Oceanography, National University of Defense Technology, NanjingUNSPECIFIED
Date:2019
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.3390/rs11111386
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:Published
Keywords:F2 peak density; empirical ionospheric model; nonlinear polynomial; radio occultation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Vorhaben Ionosphäre (old)
Location: Neustrelitz
Institutes and Institutions:Institute for Solar-Terrestrial Physics > Space Weather Observation
Deposited By: Hoque, Mohammed Mainul
Deposited On:09 Jun 2020 18:44
Last Modified:09 Jun 2020 18:44

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