Evidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations
Zenith-directed Fabry-Perot Spectrometer (FPS) and 3-Field Photometer (3FP) observations of the λ630 nm emission (~240 km altitude) were obtained at Davis station, Antarctica, during the austral winter of 1999. Eleven nights of suitable data were searched for significant periodicities com...
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ftdoajarticles:oai:doaj.org/article:a9b93767d8b54ac5904c210c1ff297d7 2023-05-15T13:36:00+02:00 Evidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations J. L. Innis P. A. Greet P. L. Dyson 2001-05-01T00:00:00Z https://doi.org/10.5194/angeo-19-533-2001 https://doaj.org/article/a9b93767d8b54ac5904c210c1ff297d7 EN eng Copernicus Publications https://www.ann-geophys.net/19/533/2001/angeo-19-533-2001.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-19-533-2001 0992-7689 1432-0576 https://doaj.org/article/a9b93767d8b54ac5904c210c1ff297d7 Annales Geophysicae, Vol 19, Pp 533-543 (2001) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2001 ftdoajarticles https://doi.org/10.5194/angeo-19-533-2001 2022-12-31T02:14:34Z Zenith-directed Fabry-Perot Spectrometer (FPS) and 3-Field Photometer (3FP) observations of the λ630 nm emission (~240 km altitude) were obtained at Davis station, Antarctica, during the austral winter of 1999. Eleven nights of suitable data were searched for significant periodicities common to vertical winds from the FPS and photo-metric variations from the 3FP. Three wave-like events were found, each of around one or more hours in duration, with periods around 15 minutes, vertical velocity amplitudes near 60 ms –1 , horizontal phase velocities around 300 ms –1 , and horizontal wavelengths from 240 to 400 km. These characteristics appear consistent with polar cap gravity waves seen by other workers, and we conclude this is a likely interpretation of our data. Assuming a source height near 125 km altitude, we determine the approximate source location by calculating back along the wave trajectory using the gravity wave property relating angle of ascent and frequency. The wave sources appear to be in the vicinity of the poleward border of the auroral oval, at magnetic local times up to 5 hours before local magnetic midnight. Key words. Meteorology and atmospheric dynamics (thermospheric dynamics; waves and tides) Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Austral Davis Station ENVELOPE(77.968,77.968,-68.576,-68.576) Davis-Station ENVELOPE(77.968,77.968,-68.576,-68.576) Annales Geophysicae 19 5 533 543 |
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 J. L. Innis P. A. Greet P. L. Dyson Evidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Zenith-directed Fabry-Perot Spectrometer (FPS) and 3-Field Photometer (3FP) observations of the λ630 nm emission (~240 km altitude) were obtained at Davis station, Antarctica, during the austral winter of 1999. Eleven nights of suitable data were searched for significant periodicities common to vertical winds from the FPS and photo-metric variations from the 3FP. Three wave-like events were found, each of around one or more hours in duration, with periods around 15 minutes, vertical velocity amplitudes near 60 ms –1 , horizontal phase velocities around 300 ms –1 , and horizontal wavelengths from 240 to 400 km. These characteristics appear consistent with polar cap gravity waves seen by other workers, and we conclude this is a likely interpretation of our data. Assuming a source height near 125 km altitude, we determine the approximate source location by calculating back along the wave trajectory using the gravity wave property relating angle of ascent and frequency. The wave sources appear to be in the vicinity of the poleward border of the auroral oval, at magnetic local times up to 5 hours before local magnetic midnight. Key words. Meteorology and atmospheric dynamics (thermospheric dynamics; waves and tides) |
format |
Article in Journal/Newspaper |
author |
J. L. Innis P. A. Greet P. L. Dyson |
author_facet |
J. L. Innis P. A. Greet P. L. Dyson |
author_sort |
J. L. Innis |
title |
Evidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations |
title_short |
Evidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations |
title_full |
Evidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations |
title_fullStr |
Evidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations |
title_full_unstemmed |
Evidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations |
title_sort |
evidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations |
publisher |
Copernicus Publications |
publishDate |
2001 |
url |
https://doi.org/10.5194/angeo-19-533-2001 https://doaj.org/article/a9b93767d8b54ac5904c210c1ff297d7 |
long_lat |
ENVELOPE(77.968,77.968,-68.576,-68.576) ENVELOPE(77.968,77.968,-68.576,-68.576) |
geographic |
Austral Davis Station Davis-Station |
geographic_facet |
Austral Davis Station Davis-Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Annales Geophysicae, Vol 19, Pp 533-543 (2001) |
op_relation |
https://www.ann-geophys.net/19/533/2001/angeo-19-533-2001.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-19-533-2001 0992-7689 1432-0576 https://doaj.org/article/a9b93767d8b54ac5904c210c1ff297d7 |
op_doi |
https://doi.org/10.5194/angeo-19-533-2001 |
container_title |
Annales Geophysicae |
container_volume |
19 |
container_issue |
5 |
container_start_page |
533 |
op_container_end_page |
543 |
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1766072936783937536 |