Morphology of NmF2 nighttime increases in the Eurasian sector

Morphology of NmF2 nighttime increases in the Eurasian sector

A statistical analysis of two peaks (pre-midnight and post-midnight) occurrence in NmF2 daily variations was made on a latitudinal chain of four ionosonde stations in the Eurasian longitudinal sector. Overall 6182 cases of the first and 5600 cases of the second peak occurrence were analyzed usin...

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Main Authors: A. V. Mikhailov, T. Yu. Leschinskaya, M. Förster
Format: Article
Language:English
Published: Copernicus Publications 2000-06-01
Series:Annales Geophysicae
Online Access:https://www.ann-geophys.net/18/618/2000/angeo-18-618-2000.pdf
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spelling doaj-55d0e2fbcfc8467ea6dc44e37d12be732020-11-25T00:34:21ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762000-06-011861862810.1007/s00585-000-0618-5Morphology of NmF2 nighttime increases in the Eurasian sectorA. V. Mikhailov0A. V. Mikhailov1A. V. Mikhailov2T. Yu. Leschinskaya3T. Yu. Leschinskaya4M. Förster5M. Förster6M. Förster7e-mail: avm71@orc.ru<i>Correspondence to:</i> A. V. MikhailovInstitute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Troitsk, Moscow Region 142092, Russiae-mail: avm71@orc.ruInstitute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Troitsk, Moscow Region 142092, Russiae-mail: avm71@orc.ruGeoForschungsZentrum, Projektbereich 2.3, Telegrafenberg, D-14473 Potsdam, Germany<i>Present address:</i> Max-Planck-Institut für extraterrestrische Physik, D-85740 Garching, GermanyA statistical analysis of two peaks (pre-midnight and post-midnight) occurrence in NmF2 daily variations was made on a latitudinal chain of four ionosonde stations in the Eurasian longitudinal sector. Overall 6182 cases of the first and 5600 cases of the second peak occurrence were analyzed using all available <i>f</i>oF2 observations for the years of solar maximum and minimum. Well-pronounced and systematic variations with season and solar activity were revealed in the occurrence probability of the peaks, their amplitude and timing. The pattern of both peaks occurrence is similar during winter and equinoxes for midlatitude stations implying one and the same mechanism of their formation. The pre-midnight summer peak shows specific variations in particular during solar maximum pointing to a different mechanism controlling its appearance. Possible mechanisms of both peaks formation are discussed.<br><br><b>Key words: </b>Ionosphere (electric fields and currents; ionosphere-magnetosphere interactions; mid-latitude ionosphere)https://www.ann-geophys.net/18/618/2000/angeo-18-618-2000.pdf
collection DOAJ
language English
format Article
sources DOAJ
author A. V. Mikhailov
A. V. Mikhailov
A. V. Mikhailov
T. Yu. Leschinskaya
T. Yu. Leschinskaya
M. Förster
M. Förster
M. Förster
spellingShingle A. V. Mikhailov
A. V. Mikhailov
A. V. Mikhailov
T. Yu. Leschinskaya
T. Yu. Leschinskaya
M. Förster
M. Förster
M. Förster
Morphology of NmF2 nighttime increases in the Eurasian sector
Annales Geophysicae
author_facet A. V. Mikhailov
A. V. Mikhailov
A. V. Mikhailov
T. Yu. Leschinskaya
T. Yu. Leschinskaya
M. Förster
M. Förster
M. Förster
author_sort A. V. Mikhailov
title Morphology of NmF2 nighttime increases in the Eurasian sector
title_short Morphology of NmF2 nighttime increases in the Eurasian sector
title_full Morphology of NmF2 nighttime increases in the Eurasian sector
title_fullStr Morphology of NmF2 nighttime increases in the Eurasian sector
title_full_unstemmed Morphology of NmF2 nighttime increases in the Eurasian sector
title_sort morphology of nmf2 nighttime increases in the eurasian sector
publisher Copernicus Publications
series Annales Geophysicae
issn 0992-7689
1432-0576
publishDate 2000-06-01
description A statistical analysis of two peaks (pre-midnight and post-midnight) occurrence in NmF2 daily variations was made on a latitudinal chain of four ionosonde stations in the Eurasian longitudinal sector. Overall 6182 cases of the first and 5600 cases of the second peak occurrence were analyzed using all available <i>f</i>oF2 observations for the years of solar maximum and minimum. Well-pronounced and systematic variations with season and solar activity were revealed in the occurrence probability of the peaks, their amplitude and timing. The pattern of both peaks occurrence is similar during winter and equinoxes for midlatitude stations implying one and the same mechanism of their formation. The pre-midnight summer peak shows specific variations in particular during solar maximum pointing to a different mechanism controlling its appearance. Possible mechanisms of both peaks formation are discussed.<br><br><b>Key words: </b>Ionosphere (electric fields and currents; ionosphere-magnetosphere interactions; mid-latitude ionosphere)
url https://www.ann-geophys.net/18/618/2000/angeo-18-618-2000.pdf
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