Intradiurnal wind variations observed in the lower thermosphere over the South Pole
International audience The first meteor radar measurements of meridional winds in the lower thermosphere (about 95 ± 5 km), along four azimuth directions: 0°, 90°E, 180° and 90°W; approximately 2° from the geographic South Pole were made during two observational campaigns: January 19, 1995-January 2...
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ftccsdartic:oai:HAL:hal-00316648v1 2023-11-12T04:26:17+01:00 Intradiurnal wind variations observed in the lower thermosphere over the South Pole Portnyagin, Y. I. Forbes, J. M. Merzlyakov, E. G. Makarov, N. A. Palo, S. E. Institute for Experimental Meteorology Department of Aerospace Engineering Sciences University of Colorado Boulder 2000 https://hal.science/hal-00316648 https://hal.science/hal-00316648/document https://hal.science/hal-00316648/file/angeo-18-547-2000.pdf en eng HAL CCSD European Geosciences Union hal-00316648 https://hal.science/hal-00316648 https://hal.science/hal-00316648/document https://hal.science/hal-00316648/file/angeo-18-547-2000.pdf info:eu-repo/semantics/OpenAccess ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316648 Annales Geophysicae, 2000, 18 (5), pp.547-554 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2000 ftccsdartic 2023-10-21T23:08:17Z International audience The first meteor radar measurements of meridional winds in the lower thermosphere (about 95 ± 5 km), along four azimuth directions: 0°, 90°E, 180° and 90°W; approximately 2° from the geographic South Pole were made during two observational campaigns: January 19, 1995-January 26, 1996, and November 21, 1996-January 27, 1997. Herein we report analyses of the measurement results, obtained during the first campaign, which cover the whole one-year period, with particular emphasis on the transient nature and seasonal behavior of the main parameters of the intradiurnal wind oscillations. To analyze the data, two complementary methods are used: the well-known periodogram (FFT) technique and the S -transform technique. The most characteristic periods of the intradiurnal oscillations are found to be rather uniformly spread between about 7 h and 12 h. All of these oscillations are westward-propagating with zonal wave number s =1 and their usual duration is confined to several periods. During the austral winter season the oscillations with periods less than 12 h are the most intensive, while during summer season the 12-h oscillations dominate. Lamb waves and internal-gravity wave propagation, non-linear interaction of the short-period tides, excitation in situ of the short period waves may be considered as possible processes which are responsible for intradiurnal wind oscillations in the lower thermosphere over South Pole. Article in Journal/Newspaper South pole Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Austral South Pole |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Portnyagin, Y. I. Forbes, J. M. Merzlyakov, E. G. Makarov, N. A. Palo, S. E. Intradiurnal wind variations observed in the lower thermosphere over the South Pole |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience The first meteor radar measurements of meridional winds in the lower thermosphere (about 95 ± 5 km), along four azimuth directions: 0°, 90°E, 180° and 90°W; approximately 2° from the geographic South Pole were made during two observational campaigns: January 19, 1995-January 26, 1996, and November 21, 1996-January 27, 1997. Herein we report analyses of the measurement results, obtained during the first campaign, which cover the whole one-year period, with particular emphasis on the transient nature and seasonal behavior of the main parameters of the intradiurnal wind oscillations. To analyze the data, two complementary methods are used: the well-known periodogram (FFT) technique and the S -transform technique. The most characteristic periods of the intradiurnal oscillations are found to be rather uniformly spread between about 7 h and 12 h. All of these oscillations are westward-propagating with zonal wave number s =1 and their usual duration is confined to several periods. During the austral winter season the oscillations with periods less than 12 h are the most intensive, while during summer season the 12-h oscillations dominate. Lamb waves and internal-gravity wave propagation, non-linear interaction of the short-period tides, excitation in situ of the short period waves may be considered as possible processes which are responsible for intradiurnal wind oscillations in the lower thermosphere over South Pole. |
author2 |
Institute for Experimental Meteorology Department of Aerospace Engineering Sciences University of Colorado Boulder |
format |
Article in Journal/Newspaper |
author |
Portnyagin, Y. I. Forbes, J. M. Merzlyakov, E. G. Makarov, N. A. Palo, S. E. |
author_facet |
Portnyagin, Y. I. Forbes, J. M. Merzlyakov, E. G. Makarov, N. A. Palo, S. E. |
author_sort |
Portnyagin, Y. I. |
title |
Intradiurnal wind variations observed in the lower thermosphere over the South Pole |
title_short |
Intradiurnal wind variations observed in the lower thermosphere over the South Pole |
title_full |
Intradiurnal wind variations observed in the lower thermosphere over the South Pole |
title_fullStr |
Intradiurnal wind variations observed in the lower thermosphere over the South Pole |
title_full_unstemmed |
Intradiurnal wind variations observed in the lower thermosphere over the South Pole |
title_sort |
intradiurnal wind variations observed in the lower thermosphere over the south pole |
publisher |
HAL CCSD |
publishDate |
2000 |
url |
https://hal.science/hal-00316648 https://hal.science/hal-00316648/document https://hal.science/hal-00316648/file/angeo-18-547-2000.pdf |
geographic |
Austral South Pole |
geographic_facet |
Austral South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
ISSN: 0992-7689 EISSN: 1432-0576 Annales Geophysicae https://hal.science/hal-00316648 Annales Geophysicae, 2000, 18 (5), pp.547-554 |
op_relation |
hal-00316648 https://hal.science/hal-00316648 https://hal.science/hal-00316648/document https://hal.science/hal-00316648/file/angeo-18-547-2000.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782340326391808000 |