Comparison of high-latitude thermospheric meridionalwinds I: optical and radar experimental comparisons
Thermospheric neutral winds at Kiruna, Sweden (67.4°N, 20.4°E) are compared using both direct optical Fabry-Perot Interferometer(FPI) measurements and those derived from European incoherent scatter radar (EISCAT) measurements. This combination of experimental data sets, both covering well over a sol...
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ftdoajarticles:oai:doaj.org/article:264d6d8d4c4b4f7ebbe4f2e51f0e571b 2023-05-15T16:04:37+02:00 Comparison of high-latitude thermospheric meridionalwinds I: optical and radar experimental comparisons E. M. Griffin I. C. F. Müller-Wodarg A. Aruliah A. Aylward 2004-03-01T00:00:00Z https://doi.org/10.5194/angeo-22-849-2004 https://doaj.org/article/264d6d8d4c4b4f7ebbe4f2e51f0e571b EN eng Copernicus Publications https://www.ann-geophys.net/22/849/2004/angeo-22-849-2004.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-22-849-2004 0992-7689 1432-0576 https://doaj.org/article/264d6d8d4c4b4f7ebbe4f2e51f0e571b Annales Geophysicae, Vol 22, Pp 849-862 (2004) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2004 ftdoajarticles https://doi.org/10.5194/angeo-22-849-2004 2022-12-31T16:06:47Z Thermospheric neutral winds at Kiruna, Sweden (67.4°N, 20.4°E) are compared using both direct optical Fabry-Perot Interferometer(FPI) measurements and those derived from European incoherent scatter radar (EISCAT) measurements. This combination of experimental data sets, both covering well over a solar cycle of data, allows for a unique comparison of the thermospheric meridional component of the neutral wind as observed by different experimental techniques. Uniquely in this study the EISCAT measurements are used to provide winds for comparison using two separate techniques: the most popular method based on the work of Salah and Holt (1974) and the Meridional Wind Model (MWM) (Miller et al., 1997) application of servo theory. The balance of forces at this location that produces the observed diurnal pattern are investigated using output from the Coupled Thermosphere and Ionosphere (CTIM) numerical model. Along with detailed comparisons from short periods the climatological behaviour of the winds have been investigated for seasonal and solar cycle dependence using the experimental techniques. While there are features which are consistent between the 3techniques, such as the evidence of the equinoctial asymmetry, there are also significant differences between the techniques both in terms of trends and absolute values. It is clear from this and previous studies that the high-latitude representation of the thermospheric neutral winds from the empirical Horizontal Wind Model (HWM), though improved from earlier versions, lacks accuracy in many conditions. The relative merits of each technique are discussed and while none of the techniques provides the perfect data set to address model performance at high-latitude, one or more needs to be included in future HWM reformulations. Key words. Meteorology and atmospheric dynamics (thermospheric dynamics), Ionosphere (ionosphere-atmosphere interactions, auroral ionosphere) Article in Journal/Newspaper EISCAT Kiruna Directory of Open Access Journals: DOAJ Articles Kiruna Annales Geophysicae 22 3 849 862 |
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 E. M. Griffin I. C. F. Müller-Wodarg A. Aruliah A. Aylward Comparison of high-latitude thermospheric meridionalwinds I: optical and radar experimental comparisons |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Thermospheric neutral winds at Kiruna, Sweden (67.4°N, 20.4°E) are compared using both direct optical Fabry-Perot Interferometer(FPI) measurements and those derived from European incoherent scatter radar (EISCAT) measurements. This combination of experimental data sets, both covering well over a solar cycle of data, allows for a unique comparison of the thermospheric meridional component of the neutral wind as observed by different experimental techniques. Uniquely in this study the EISCAT measurements are used to provide winds for comparison using two separate techniques: the most popular method based on the work of Salah and Holt (1974) and the Meridional Wind Model (MWM) (Miller et al., 1997) application of servo theory. The balance of forces at this location that produces the observed diurnal pattern are investigated using output from the Coupled Thermosphere and Ionosphere (CTIM) numerical model. Along with detailed comparisons from short periods the climatological behaviour of the winds have been investigated for seasonal and solar cycle dependence using the experimental techniques. While there are features which are consistent between the 3techniques, such as the evidence of the equinoctial asymmetry, there are also significant differences between the techniques both in terms of trends and absolute values. It is clear from this and previous studies that the high-latitude representation of the thermospheric neutral winds from the empirical Horizontal Wind Model (HWM), though improved from earlier versions, lacks accuracy in many conditions. The relative merits of each technique are discussed and while none of the techniques provides the perfect data set to address model performance at high-latitude, one or more needs to be included in future HWM reformulations. Key words. Meteorology and atmospheric dynamics (thermospheric dynamics), Ionosphere (ionosphere-atmosphere interactions, auroral ionosphere) |
format |
Article in Journal/Newspaper |
author |
E. M. Griffin I. C. F. Müller-Wodarg A. Aruliah A. Aylward |
author_facet |
E. M. Griffin I. C. F. Müller-Wodarg A. Aruliah A. Aylward |
author_sort |
E. M. Griffin |
title |
Comparison of high-latitude thermospheric meridionalwinds I: optical and radar experimental comparisons |
title_short |
Comparison of high-latitude thermospheric meridionalwinds I: optical and radar experimental comparisons |
title_full |
Comparison of high-latitude thermospheric meridionalwinds I: optical and radar experimental comparisons |
title_fullStr |
Comparison of high-latitude thermospheric meridionalwinds I: optical and radar experimental comparisons |
title_full_unstemmed |
Comparison of high-latitude thermospheric meridionalwinds I: optical and radar experimental comparisons |
title_sort |
comparison of high-latitude thermospheric meridionalwinds i: optical and radar experimental comparisons |
publisher |
Copernicus Publications |
publishDate |
2004 |
url |
https://doi.org/10.5194/angeo-22-849-2004 https://doaj.org/article/264d6d8d4c4b4f7ebbe4f2e51f0e571b |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
EISCAT Kiruna |
genre_facet |
EISCAT Kiruna |
op_source |
Annales Geophysicae, Vol 22, Pp 849-862 (2004) |
op_relation |
https://www.ann-geophys.net/22/849/2004/angeo-22-849-2004.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-22-849-2004 0992-7689 1432-0576 https://doaj.org/article/264d6d8d4c4b4f7ebbe4f2e51f0e571b |
op_doi |
https://doi.org/10.5194/angeo-22-849-2004 |
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Annales Geophysicae |
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22 |
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3 |
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862 |
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