Comparison of CSES ionospheric RO data with COSMIC measurements

<p>CSES (China Seismo-Electromagnetic Satellite) is a newly launched electric-magnetic satellite in China. A GNSS occultation receiver (GOR) is installed on the satellite to retrieve electron density related parameters. In order to validate the radio occultation (RO) data from the GOR on board...

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Main Authors: X. Wang, W. Cheng, Z. Zhou, S. Xu, D. Yang, J. Cui
Format: Article
Language:English
Published: Copernicus Publications 2019-11-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/37/1025/2019/angeo-37-1025-2019.pdf
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spelling doaj-9711b658c6f44635a73132c08b2e806f2020-11-24T21:56:57ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762019-11-01371025103810.5194/angeo-37-1025-2019Comparison of CSES ionospheric RO data with COSMIC measurementsX. Wang0W. Cheng1Z. Zhou2S. Xu3D. Yang4J. Cui5Institute of Crustal Dynamics, China Earthquake Administration, Beijing, ChinaXinyang Station, Henan Earthquake Administration, Henan, ChinaInstitute of Crustal Dynamics, China Earthquake Administration, Beijing, ChinaInstitute of Crustal Dynamics, China Earthquake Administration, Beijing, ChinaInstitute of Crustal Dynamics, China Earthquake Administration, Beijing, ChinaInstitute of Crustal Dynamics, China Earthquake Administration, Beijing, China<p>CSES (China Seismo-Electromagnetic Satellite) is a newly launched electric-magnetic satellite in China. A GNSS occultation receiver (GOR) is installed on the satellite to retrieve electron density related parameters. In order to validate the radio occultation (RO) data from the GOR on board CSES, a comparison between CSES RO and the co-located COSMIC RO data is conducted to check the consistency and reliability of the CSES RO data using measurements from 12 February 2018 to 31 March 2019. CSES RO peak values (<i>Nm</i>F2), peak heights (<i>hm</i>F2), and electron density profiles (EPDs) are compared with corresponding COSMIC measurements in this study. The results show that (1) <i>Nm</i>F2 between CSES and COSMIC is in extremely good agreement, with a correlation coefficient of 0.9898. The near-zero bias between the two sets is <span class="inline-formula">0.005363×10<sup>5</sup></span>&thinsp;cm<span class="inline-formula"><sup>−3</sup></span> with a RMSE of <span class="inline-formula">0.3638×10<sup>5</sup></span>&thinsp;cm<span class="inline-formula"><sup>−3</sup></span>, and the relative bias is 1.97&thinsp;% with a relative RMSE of 16.17&thinsp;%, which are in accordance with previous studies according to error propagation rules. (2) <i>hm</i>F2 between the two missions is also in very good agreement with a correlation coefficient of 0.9385; the mean difference between the two sets is 0.59&thinsp;km with a RMSE of 12.28&thinsp;km, which is within the error limits of previous studies. (3) Co-located EDPs between the two sets are generally in good agreement, but with a better agreement for data above 200&thinsp;km than those below this altitude. Data at the peak height ranges show the best agreement, and then data above the peak regions; data below the peak regions, especially at the altitude of about the E layer, show relatively large fluctuations. It is concluded that CSES RO data are in good agreement with COSMIC measurements, and the CSES RO data are applicable for most ionosphere-related studies considering the wide acceptance and application of COSMIC RO measurements. However, particular attention should be paid to EDP data below peak regions in application as data at the bottom side of the profiles are less reliable than that at the peak and topside regions.</p>https://www.ann-geophys.net/37/1025/2019/angeo-37-1025-2019.pdf
collection DOAJ
language English
format Article
sources DOAJ
author X. Wang
W. Cheng
Z. Zhou
S. Xu
D. Yang
J. Cui
spellingShingle X. Wang
W. Cheng
Z. Zhou
S. Xu
D. Yang
J. Cui
Comparison of CSES ionospheric RO data with COSMIC measurements
Annales Geophysicae
author_facet X. Wang
W. Cheng
Z. Zhou
S. Xu
D. Yang
J. Cui
author_sort X. Wang
title Comparison of CSES ionospheric RO data with COSMIC measurements
title_short Comparison of CSES ionospheric RO data with COSMIC measurements
title_full Comparison of CSES ionospheric RO data with COSMIC measurements
title_fullStr Comparison of CSES ionospheric RO data with COSMIC measurements
title_full_unstemmed Comparison of CSES ionospheric RO data with COSMIC measurements
title_sort comparison of cses ionospheric ro data with cosmic measurements
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 2019-11-01
description <p>CSES (China Seismo-Electromagnetic Satellite) is a newly launched electric-magnetic satellite in China. A GNSS occultation receiver (GOR) is installed on the satellite to retrieve electron density related parameters. In order to validate the radio occultation (RO) data from the GOR on board CSES, a comparison between CSES RO and the co-located COSMIC RO data is conducted to check the consistency and reliability of the CSES RO data using measurements from 12 February 2018 to 31 March 2019. CSES RO peak values (<i>Nm</i>F2), peak heights (<i>hm</i>F2), and electron density profiles (EPDs) are compared with corresponding COSMIC measurements in this study. The results show that (1) <i>Nm</i>F2 between CSES and COSMIC is in extremely good agreement, with a correlation coefficient of 0.9898. The near-zero bias between the two sets is <span class="inline-formula">0.005363×10<sup>5</sup></span>&thinsp;cm<span class="inline-formula"><sup>−3</sup></span> with a RMSE of <span class="inline-formula">0.3638×10<sup>5</sup></span>&thinsp;cm<span class="inline-formula"><sup>−3</sup></span>, and the relative bias is 1.97&thinsp;% with a relative RMSE of 16.17&thinsp;%, which are in accordance with previous studies according to error propagation rules. (2) <i>hm</i>F2 between the two missions is also in very good agreement with a correlation coefficient of 0.9385; the mean difference between the two sets is 0.59&thinsp;km with a RMSE of 12.28&thinsp;km, which is within the error limits of previous studies. (3) Co-located EDPs between the two sets are generally in good agreement, but with a better agreement for data above 200&thinsp;km than those below this altitude. Data at the peak height ranges show the best agreement, and then data above the peak regions; data below the peak regions, especially at the altitude of about the E layer, show relatively large fluctuations. It is concluded that CSES RO data are in good agreement with COSMIC measurements, and the CSES RO data are applicable for most ionosphere-related studies considering the wide acceptance and application of COSMIC RO measurements. However, particular attention should be paid to EDP data below peak regions in application as data at the bottom side of the profiles are less reliable than that at the peak and topside regions.</p>
url https://www.ann-geophys.net/37/1025/2019/angeo-37-1025-2019.pdf
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