The association of polar mesosphere summer echo layers with tial modes
The occurrence of PMSEs with time of day shows a semi-diurnal variation with minima at 8 and 20 h LT. PMSE layers observed for more than 30 min show an average rate of descent of 2 km h –1 . These characteristics suggest the influence of tidal winds. When the observed steady wind and diurnal and sem...
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Copernicus Publications
1995
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ftdoajarticles:oai:doaj.org/article:7ec36aa2fd964d9baba455779e71e863 2023-05-15T16:04:40+02:00 The association of polar mesosphere summer echo layers with tial modes P. J. S. Williams G. O. L. Jones J. R. Palmer H. Rishbeth 1995-04-01T00:00:00Z https://doi.org/10.1007/s00585-995-0454-8 https://doaj.org/article/7ec36aa2fd964d9baba455779e71e863 EN eng Copernicus Publications https://www.ann-geophys.net/13/454/1995/angeo-13-454-1995.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-995-0454-8 0992-7689 1432-0576 https://doaj.org/article/7ec36aa2fd964d9baba455779e71e863 Annales Geophysicae, Vol 13, Pp 454-457 (1995) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 1995 ftdoajarticles https://doi.org/10.1007/s00585-995-0454-8 2022-12-31T08:55:19Z The occurrence of PMSEs with time of day shows a semi-diurnal variation with minima at 8 and 20 h LT. PMSE layers observed for more than 30 min show an average rate of descent of 2 km h –1 . These characteristics suggest the influence of tidal winds. When the observed steady wind and diurnal and semi-diurnal tides at EISCAT are added, the overall magnitude shows a time-variation which matches the occurrence of PMSEs, and the observed rate of descent, approximately 2 km h –1 . Atmospheric gravity waves also contribute to the velocity of the neutral wind. When the wave reinforces the background wind, the PMSEs are stronger and descend more rapidly, but when the wave-related velocity opposes the background wind the PMSE is weaker and it descends more slowly. Article in Journal/Newspaper EISCAT Directory of Open Access Journals: DOAJ Articles Annales Geophysicae 13 4 454 457 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 P. J. S. Williams G. O. L. Jones J. R. Palmer H. Rishbeth The association of polar mesosphere summer echo layers with tial modes |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
The occurrence of PMSEs with time of day shows a semi-diurnal variation with minima at 8 and 20 h LT. PMSE layers observed for more than 30 min show an average rate of descent of 2 km h –1 . These characteristics suggest the influence of tidal winds. When the observed steady wind and diurnal and semi-diurnal tides at EISCAT are added, the overall magnitude shows a time-variation which matches the occurrence of PMSEs, and the observed rate of descent, approximately 2 km h –1 . Atmospheric gravity waves also contribute to the velocity of the neutral wind. When the wave reinforces the background wind, the PMSEs are stronger and descend more rapidly, but when the wave-related velocity opposes the background wind the PMSE is weaker and it descends more slowly. |
format |
Article in Journal/Newspaper |
author |
P. J. S. Williams G. O. L. Jones J. R. Palmer H. Rishbeth |
author_facet |
P. J. S. Williams G. O. L. Jones J. R. Palmer H. Rishbeth |
author_sort |
P. J. S. Williams |
title |
The association of polar mesosphere summer echo layers with tial modes |
title_short |
The association of polar mesosphere summer echo layers with tial modes |
title_full |
The association of polar mesosphere summer echo layers with tial modes |
title_fullStr |
The association of polar mesosphere summer echo layers with tial modes |
title_full_unstemmed |
The association of polar mesosphere summer echo layers with tial modes |
title_sort |
association of polar mesosphere summer echo layers with tial modes |
publisher |
Copernicus Publications |
publishDate |
1995 |
url |
https://doi.org/10.1007/s00585-995-0454-8 https://doaj.org/article/7ec36aa2fd964d9baba455779e71e863 |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Annales Geophysicae, Vol 13, Pp 454-457 (1995) |
op_relation |
https://www.ann-geophys.net/13/454/1995/angeo-13-454-1995.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.1007/s00585-995-0454-8 0992-7689 1432-0576 https://doaj.org/article/7ec36aa2fd964d9baba455779e71e863 |
op_doi |
https://doi.org/10.1007/s00585-995-0454-8 |
container_title |
Annales Geophysicae |
container_volume |
13 |
container_issue |
4 |
container_start_page |
454 |
op_container_end_page |
457 |
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1766400277384003584 |