Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements
In this study, the ionospheric electron density profiles retrieved from radio occultation measurements of the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission are analyzed to determine the F2 layer maximum electron density (NmF2), peak height (hmF2), and Chapma...
Published in: | Journal of Geophysical Research: Space Physics |
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American Geophysical Union
2011
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Online Access: | http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-004-400 https://doi.org/10.1029/2011JA016691 |
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ftncar:oai:drupal-site.org:articles_17555 2023-07-30T04:07:25+02:00 Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements Liu, Libo (author) Le, Huijun (author) Chen, Yiding (author) He, Maosheng (author) Wan, Weixing (author) Yue, Xinan (author) 2011-09-10 application/pdf http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-004-400 https://doi.org/10.1029/2011JA016691 en eng American Geophysical Union Journal of Geophysical Research-Space Physics http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-004-400 doi:10.1029/2011JA016691 ark:/85065/d74f1s2n Copyright 2011 American Geophysical Union. Equatorial ionosphere Solar radiation and cosmic ray effects Plasma temperature and density Ionosphere Text article 2011 ftncar https://doi.org/10.1029/2011JA016691 2023-07-17T18:14:58Z In this study, the ionospheric electron density profiles retrieved from radio occultation measurements of the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission are analyzed to determine the F2 layer maximum electron density (NmF2), peak height (hmF2), and Chapman scale height (Hm). During the deep solar minimum of 2008–2009, NmF2, hmF2, and Hm show complicated seasonal variations, which are generally consistent with those in previous solar minima. Besides the equinoctial asymmetry, nonseasonal and semiannual anomalies are present in daytime NmF2; the Weddell Sea anomaly appears in nighttime NmF2 in all seasons except the June solstice. Unusually higher values of hmF2 and Hm appear at southern middle latitudes in the region centered at 70°E in the daytime and hmF2 at 70°W in the nighttime. Wave-like longitudinal patterns are evidently present at low latitudes in all three parameters, showing diurnal and seasonal nature. The values of the parameters under study are smaller in 2008–2009 than the rest of the COSMIC period examined in this study. The seasonal and latitudinal pattern of daytime NmF2 on the solar sensitivity not only confirms our earlier investigation but also explains the observed small NmF2 in 2008–2009 in response to the reduced solar extreme ultraviolet radiance. National Science Foundation (NSF): AGS-0918398 National Science Foundation (NSF): AGS-0961147 Article in Journal/Newspaper Weddell Sea OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Weddell Sea Weddell Journal of Geophysical Research: Space Physics 116 A9 n/a n/a |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
topic |
Equatorial ionosphere Solar radiation and cosmic ray effects Plasma temperature and density Ionosphere |
spellingShingle |
Equatorial ionosphere Solar radiation and cosmic ray effects Plasma temperature and density Ionosphere Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements |
topic_facet |
Equatorial ionosphere Solar radiation and cosmic ray effects Plasma temperature and density Ionosphere |
description |
In this study, the ionospheric electron density profiles retrieved from radio occultation measurements of the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission are analyzed to determine the F2 layer maximum electron density (NmF2), peak height (hmF2), and Chapman scale height (Hm). During the deep solar minimum of 2008–2009, NmF2, hmF2, and Hm show complicated seasonal variations, which are generally consistent with those in previous solar minima. Besides the equinoctial asymmetry, nonseasonal and semiannual anomalies are present in daytime NmF2; the Weddell Sea anomaly appears in nighttime NmF2 in all seasons except the June solstice. Unusually higher values of hmF2 and Hm appear at southern middle latitudes in the region centered at 70°E in the daytime and hmF2 at 70°W in the nighttime. Wave-like longitudinal patterns are evidently present at low latitudes in all three parameters, showing diurnal and seasonal nature. The values of the parameters under study are smaller in 2008–2009 than the rest of the COSMIC period examined in this study. The seasonal and latitudinal pattern of daytime NmF2 on the solar sensitivity not only confirms our earlier investigation but also explains the observed small NmF2 in 2008–2009 in response to the reduced solar extreme ultraviolet radiance. National Science Foundation (NSF): AGS-0918398 National Science Foundation (NSF): AGS-0961147 |
author2 |
Liu, Libo (author) Le, Huijun (author) Chen, Yiding (author) He, Maosheng (author) Wan, Weixing (author) Yue, Xinan (author) |
format |
Article in Journal/Newspaper |
title |
Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements |
title_short |
Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements |
title_full |
Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements |
title_fullStr |
Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements |
title_full_unstemmed |
Features of the middle- and low-latitude ionosphere during solar minimum as revealed from COSMIC radio occultation measurements |
title_sort |
features of the middle- and low-latitude ionosphere during solar minimum as revealed from cosmic radio occultation measurements |
publisher |
American Geophysical Union |
publishDate |
2011 |
url |
http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-004-400 https://doi.org/10.1029/2011JA016691 |
geographic |
Weddell Sea Weddell |
geographic_facet |
Weddell Sea Weddell |
genre |
Weddell Sea |
genre_facet |
Weddell Sea |
op_relation |
Journal of Geophysical Research-Space Physics http://nldr.library.ucar.edu/repository/collections/OSGC-000-000-004-400 doi:10.1029/2011JA016691 ark:/85065/d74f1s2n |
op_rights |
Copyright 2011 American Geophysical Union. |
op_doi |
https://doi.org/10.1029/2011JA016691 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
116 |
container_issue |
A9 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1772820712710471680 |