Low-latitude ionospheric height variation as observed by meridional ionosonde chain: Formation of ionospheric ceiling over the magnetic equator

©2014. American Geophysical Union. All Rights Reserved. A multipoint ionosonde observation campaign was conducted along the magnetic meridional plane in Southeast Asia to study ionosphere-thermosphere coupling. One station was near the magnetic equator and two of the other stations were at off-equat...

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Main Authors: Takashi Maruyama, Jyunpei Uemoto, Mamoru Ishii, Takuya Tsugawa, Pornchai Supnithi, Taradol Komolmis
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/45679
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-456792018-01-24T06:15:01Z Low-latitude ionospheric height variation as observed by meridional ionosonde chain: Formation of ionospheric ceiling over the magnetic equator Takashi Maruyama Jyunpei Uemoto Mamoru Ishii Takuya Tsugawa Pornchai Supnithi Taradol Komolmis ©2014. American Geophysical Union. All Rights Reserved. A multipoint ionosonde observation campaign was conducted along the magnetic meridional plane in Southeast Asia to study ionosphere-thermosphere coupling. One station was near the magnetic equator and two of the other stations were at off-equatorial latitudes (∼10° magnetic latitude). The daytime ionospheric peak height (h m F 2 ) was analyzed for each season during the solar minimum years, 2006-2007 and 2009. The peak height increased for ∼3 h after sunrise at the magnetic equator and off-equatorial latitudes, as expected from the daytime upward E × B drift. The apparent upward drift at the magnetic equator ceased before noon, while the drift at the off-equatorial latitudes continued upward and the layer height exceeded the equatorial height around noon. The noontime limited layer peak height at the magnetic equator, which was termed the ionospheric ceiling, did not depend on the season, while the maximum peak height at the off-equatorial latitudes largely varied with each season. Numerical modeling using the SAMI2 code was conducted and the features of the ionospheric ceiling were reproduced quite well. The dynamical parameters provided by the SAMI2 modeling runs showed that the ionospheric ceiling is formed by the field-aligned plasma diffusion, which is a part of the fountain effect. Key Points Multipoint ionosonde observation along the magnetic meridian in Southeast Asia Noontime restricted F layer peak height at the magnetic equator Revisiting the equatorial anomaly from the viewpoint of height variations 2018-01-24T06:15:01Z 2018-01-24T06:15:01Z 2014-01-01 Journal 21699402 21699380 2-s2.0-84921725412 10.1002/2014JA020215 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84921725412&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/45679
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
description ©2014. American Geophysical Union. All Rights Reserved. A multipoint ionosonde observation campaign was conducted along the magnetic meridional plane in Southeast Asia to study ionosphere-thermosphere coupling. One station was near the magnetic equator and two of the other stations were at off-equatorial latitudes (∼10° magnetic latitude). The daytime ionospheric peak height (h m F 2 ) was analyzed for each season during the solar minimum years, 2006-2007 and 2009. The peak height increased for ∼3 h after sunrise at the magnetic equator and off-equatorial latitudes, as expected from the daytime upward E × B drift. The apparent upward drift at the magnetic equator ceased before noon, while the drift at the off-equatorial latitudes continued upward and the layer height exceeded the equatorial height around noon. The noontime limited layer peak height at the magnetic equator, which was termed the ionospheric ceiling, did not depend on the season, while the maximum peak height at the off-equatorial latitudes largely varied with each season. Numerical modeling using the SAMI2 code was conducted and the features of the ionospheric ceiling were reproduced quite well. The dynamical parameters provided by the SAMI2 modeling runs showed that the ionospheric ceiling is formed by the field-aligned plasma diffusion, which is a part of the fountain effect. Key Points Multipoint ionosonde observation along the magnetic meridian in Southeast Asia Noontime restricted F layer peak height at the magnetic equator Revisiting the equatorial anomaly from the viewpoint of height variations
format Journal
author Takashi Maruyama
Jyunpei Uemoto
Mamoru Ishii
Takuya Tsugawa
Pornchai Supnithi
Taradol Komolmis
spellingShingle Takashi Maruyama
Jyunpei Uemoto
Mamoru Ishii
Takuya Tsugawa
Pornchai Supnithi
Taradol Komolmis
Low-latitude ionospheric height variation as observed by meridional ionosonde chain: Formation of ionospheric ceiling over the magnetic equator
author_facet Takashi Maruyama
Jyunpei Uemoto
Mamoru Ishii
Takuya Tsugawa
Pornchai Supnithi
Taradol Komolmis
author_sort Takashi Maruyama
title Low-latitude ionospheric height variation as observed by meridional ionosonde chain: Formation of ionospheric ceiling over the magnetic equator
title_short Low-latitude ionospheric height variation as observed by meridional ionosonde chain: Formation of ionospheric ceiling over the magnetic equator
title_full Low-latitude ionospheric height variation as observed by meridional ionosonde chain: Formation of ionospheric ceiling over the magnetic equator
title_fullStr Low-latitude ionospheric height variation as observed by meridional ionosonde chain: Formation of ionospheric ceiling over the magnetic equator
title_full_unstemmed Low-latitude ionospheric height variation as observed by meridional ionosonde chain: Formation of ionospheric ceiling over the magnetic equator
title_sort low-latitude ionospheric height variation as observed by meridional ionosonde chain: formation of ionospheric ceiling over the magnetic equator
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84921725412&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/45679
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