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...
Main Authors: | , , |
---|---|
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 |
id |
doaj-55d0e2fbcfc8467ea6dc44e37d12be73 |
---|---|
record_format |
Article |
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 |
work_keys_str_mv |
AT avmikhailov morphologyofnmf2nighttimeincreasesintheeurasiansector AT avmikhailov morphologyofnmf2nighttimeincreasesintheeurasiansector AT avmikhailov morphologyofnmf2nighttimeincreasesintheeurasiansector AT tyuleschinskaya morphologyofnmf2nighttimeincreasesintheeurasiansector AT tyuleschinskaya morphologyofnmf2nighttimeincreasesintheeurasiansector AT mforster morphologyofnmf2nighttimeincreasesintheeurasiansector AT mforster morphologyofnmf2nighttimeincreasesintheeurasiansector AT mforster morphologyofnmf2nighttimeincreasesintheeurasiansector |
_version_ |
1725313954348007424 |