Statistical analysis of thermospheric gravity waves from Fabry-Perot Interferometer measurements of atomic oxygen
Data from the Fabry-Perot Interferometers at KEOPS (Sweden), Sodankylä (Finland), and Svalbard (Norway), have been analysed for gravity wave activity on all the clear nights from 2000 to 2006. A total of 249 nights were available from KEOPS, 133 from Sodankylä and 185 from the Svalbard FPI. A Lomb-S...
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ftdoajarticles:oai:doaj.org/article:7438336456b6487bb9c217c2d1c8ff9a 2023-05-15T18:20:15+02:00 Statistical analysis of thermospheric gravity waves from Fabry-Perot Interferometer measurements of atomic oxygen E. A. K. Ford A. L. Aruliah E. M. Griffin I. McWhirter 2008-02-01T00:00:00Z https://doi.org/10.5194/angeo-26-29-2008 https://doaj.org/article/7438336456b6487bb9c217c2d1c8ff9a EN eng Copernicus Publications https://www.ann-geophys.net/26/29/2008/angeo-26-29-2008.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-26-29-2008 0992-7689 1432-0576 https://doaj.org/article/7438336456b6487bb9c217c2d1c8ff9a Annales Geophysicae, Vol 26, Pp 29-45 (2008) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2008 ftdoajarticles https://doi.org/10.5194/angeo-26-29-2008 2022-12-31T03:10:51Z Data from the Fabry-Perot Interferometers at KEOPS (Sweden), Sodankylä (Finland), and Svalbard (Norway), have been analysed for gravity wave activity on all the clear nights from 2000 to 2006. A total of 249 nights were available from KEOPS, 133 from Sodankylä and 185 from the Svalbard FPI. A Lomb-Scargle analysis was performed on each of these nights to identify the periods of any wave activity during the night. Comparisons between many nights of data allow the general characteristics of the waves that are present in the high latitude upper thermosphere to be determined. Comparisons were made between the different parameters: the atomic oxygen intensities, the thermospheric winds and temperatures, and for each parameter the distribution of frequencies of the waves was determined. No dependence on the number of waves on geomagnetic activity levels, or position in the solar cycle, was found. All the FPIs have had different detectors at various times, producing different time resolutions of the data, so comparisons between the different years, and between data from different sites, showed how the time resolution determines which waves are observed. In addition to the cutoff due to the Nyquist frequency, poor resolution observations significantly reduce the number of short-period waves (<1 h period) that may be detected with confidence. The length of the dataset, which is usually determined by the length of the night, was the main factor influencing the number of long period waves (>5 h) detected. Comparisons between the number of gravity waves detected at KEOPS and Sodankylä over all the seasons showed a similar proportion of waves to the number of nights used for both sites, as expected since the two sites are at similar latitudes and therefore locations with respect to the auroral oval, confirming this as a likely source region. Svalbard showed fewer waves with short periods than KEOPS data for a season when both had the same time resolution data. This gives a clear indication of the direction of flow of ... Article in Journal/Newspaper Sodankylä Svalbard Directory of Open Access Journals: DOAJ Articles Svalbard Norway Sodankylä ENVELOPE(26.600,26.600,67.417,67.417) Annales Geophysicae 26 1 29 45 |
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English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 E. A. K. Ford A. L. Aruliah E. M. Griffin I. McWhirter Statistical analysis of thermospheric gravity waves from Fabry-Perot Interferometer measurements of atomic oxygen |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Data from the Fabry-Perot Interferometers at KEOPS (Sweden), Sodankylä (Finland), and Svalbard (Norway), have been analysed for gravity wave activity on all the clear nights from 2000 to 2006. A total of 249 nights were available from KEOPS, 133 from Sodankylä and 185 from the Svalbard FPI. A Lomb-Scargle analysis was performed on each of these nights to identify the periods of any wave activity during the night. Comparisons between many nights of data allow the general characteristics of the waves that are present in the high latitude upper thermosphere to be determined. Comparisons were made between the different parameters: the atomic oxygen intensities, the thermospheric winds and temperatures, and for each parameter the distribution of frequencies of the waves was determined. No dependence on the number of waves on geomagnetic activity levels, or position in the solar cycle, was found. All the FPIs have had different detectors at various times, producing different time resolutions of the data, so comparisons between the different years, and between data from different sites, showed how the time resolution determines which waves are observed. In addition to the cutoff due to the Nyquist frequency, poor resolution observations significantly reduce the number of short-period waves (<1 h period) that may be detected with confidence. The length of the dataset, which is usually determined by the length of the night, was the main factor influencing the number of long period waves (>5 h) detected. Comparisons between the number of gravity waves detected at KEOPS and Sodankylä over all the seasons showed a similar proportion of waves to the number of nights used for both sites, as expected since the two sites are at similar latitudes and therefore locations with respect to the auroral oval, confirming this as a likely source region. Svalbard showed fewer waves with short periods than KEOPS data for a season when both had the same time resolution data. This gives a clear indication of the direction of flow of ... |
format |
Article in Journal/Newspaper |
author |
E. A. K. Ford A. L. Aruliah E. M. Griffin I. McWhirter |
author_facet |
E. A. K. Ford A. L. Aruliah E. M. Griffin I. McWhirter |
author_sort |
E. A. K. Ford |
title |
Statistical analysis of thermospheric gravity waves from Fabry-Perot Interferometer measurements of atomic oxygen |
title_short |
Statistical analysis of thermospheric gravity waves from Fabry-Perot Interferometer measurements of atomic oxygen |
title_full |
Statistical analysis of thermospheric gravity waves from Fabry-Perot Interferometer measurements of atomic oxygen |
title_fullStr |
Statistical analysis of thermospheric gravity waves from Fabry-Perot Interferometer measurements of atomic oxygen |
title_full_unstemmed |
Statistical analysis of thermospheric gravity waves from Fabry-Perot Interferometer measurements of atomic oxygen |
title_sort |
statistical analysis of thermospheric gravity waves from fabry-perot interferometer measurements of atomic oxygen |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/angeo-26-29-2008 https://doaj.org/article/7438336456b6487bb9c217c2d1c8ff9a |
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ENVELOPE(26.600,26.600,67.417,67.417) |
geographic |
Svalbard Norway Sodankylä |
geographic_facet |
Svalbard Norway Sodankylä |
genre |
Sodankylä Svalbard |
genre_facet |
Sodankylä Svalbard |
op_source |
Annales Geophysicae, Vol 26, Pp 29-45 (2008) |
op_relation |
https://www.ann-geophys.net/26/29/2008/angeo-26-29-2008.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-26-29-2008 0992-7689 1432-0576 https://doaj.org/article/7438336456b6487bb9c217c2d1c8ff9a |
op_doi |
https://doi.org/10.5194/angeo-26-29-2008 |
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Annales Geophysicae |
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26 |
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1 |
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29 |
op_container_end_page |
45 |
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