Poster (Scientific congresses and symposiums)
Comparison of ICON O+ density profiles with electron density profiles provided by COSMIC-2 and ground-based ionosondes
Wautelet, Gilles; Hubert, Benoît; Gérard, Jean-Claude et al.
2020AGU Fall Meeting 2020
Peer reviewed
 

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Keywords :
ICON; airglow; electron density profile; comparison; COSMIC-2; ionosondes
Abstract :
[en] In October 2019, NASA-ICON was launched to observe the low-latitude ionosphere using in-situ and remote sensing instruments, from a LEO circular orbit at about 575 km altitude. The six satellites of the radio-occultation program COSMIC-2 were also successfully launched and currently provide up to 3000 electron density profiles on a daily basis since October 1, 2019. Besides, the network of ground-based ionosondes is constantly growing and allows retrieving very accurate measurements of the electron density profile up to the peak altitude. These three sources of scientific observation of the Earth ionosphere therefore provide a very complementary set of data. We compare O+ density profiles provided during nighttime by the ICON-FUV instrument and during daytime by the ICON-EUV instrument against electron density profiles measured by COSMIC-2 and ionosondes. Co-located and simultaneous observations are compared on statistical grounds, and the differences between the several methods are investigated. Particular attention is given to the most important variables, such as the altitude and the density of the F-peak, hmF2 and NmF2. The time interval considered in this study covers the whole ICON data availability period, which started on November 16, 2019. Manual screening and scaling of ionograms is performed to ensure reliable ionosonde data, while COSMIC-2 data are carefully selected using an automatic quality control algorithm. A particular attention has been brought to the geometry of the observation, because the line-of-sight integration of both airglow and radio-occultation measurements assimilates horizontal and vertical gradients. As a consequence, the local density profiles obtained by inversion of the ICON and COSMIC-2 observation cannot be exactly assimilated to vertical measurements, such as vertical incidence soundings from ionosondes. This slightly limits the reach of the interpretation of the comparison between data of different origin. However, using similar observing geometries, the comparison of ICON and COSMIC-2 data does nevertheless provide very reliable and valuable comparisons.
Disciplines :
Space science, astronomy & astrophysics
Earth sciences & physical geography
Author, co-author :
Wautelet, Gilles  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Hubert, Benoît  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Immel, Tom;  Berkeley University of California - UC Berkeley > Space Sciences Laboratory
Frey, Harald;  Berkeley University of California - UC Berkeley > Space Sciences Laboratory
Mende, Stephen;  Berkeley University of California - UC Berkeley > Space Sciences Laboratory
Kamalabadi, Farzad;  University of Illinois Urbana Champaign
Kamaci, Ulas;  University of Illinois Urbana Champaign
Stephan, Andrew;  U.S. Naval Research Laboratory
Language :
English
Title :
Comparison of ICON O+ density profiles with electron density profiles provided by COSMIC-2 and ground-based ionosondes
Publication date :
December 2020
Number of pages :
e-poster
Event name :
AGU Fall Meeting 2020
Event organizer :
AGU
Event date :
1 - 17 December 2020
Audience :
International
Peer reviewed :
Peer reviewed
Name of the research project :
Combining airglow, GNSS and ionosonde data to study ionospheric irregularities over low latitudes
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
BELSPO - Politique scientifique fédérale [BE]
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since 30 January 2021

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