Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, Norway
Simultaneous observations were conducted with a Fabry-Perot Interferometer (FPI) at a wavelength of 557.7 nm, an all-sky camera at a wavelength of 557.7 nm, and the European Incoherent Scatter (EISCAT) UHF radar during the Dynamics and Energetics of the Lower Thermosphere in Aurora 2 (DELTA-2) campa...
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ftdoajarticles:oai:doaj.org/article:9c629a0e9f224642ba4d3fc3148b956a 2023-05-15T16:04:34+02:00 Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, Norway S. Oyama K. Shiokawa J. Kurihara T. T. Tsuda S. Nozawa Y. Ogawa Y. Otsuka B. J. Watkins 2010-10-01T00:00:00Z https://doi.org/10.5194/angeo-28-1847-2010 https://doaj.org/article/9c629a0e9f224642ba4d3fc3148b956a EN eng Copernicus Publications https://www.ann-geophys.net/28/1847/2010/angeo-28-1847-2010.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-28-1847-2010 0992-7689 1432-0576 https://doaj.org/article/9c629a0e9f224642ba4d3fc3148b956a Annales Geophysicae, Vol 28, Pp 1847-1857 (2010) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2010 ftdoajarticles https://doi.org/10.5194/angeo-28-1847-2010 2022-12-31T15:22:40Z Simultaneous observations were conducted with a Fabry-Perot Interferometer (FPI) at a wavelength of 557.7 nm, an all-sky camera at a wavelength of 557.7 nm, and the European Incoherent Scatter (EISCAT) UHF radar during the Dynamics and Energetics of the Lower Thermosphere in Aurora 2 (DELTA-2) campaign in January 2009. This paper concentrated on two events during periods of pulsating aurora. The lower-thermospheric wind velocity measured with the FPI showed obvious fluctuations in both vertical and horizontal components. Of particular interest is that the location of the fluctuations was found in a darker area that appeared within the pulsating aurora. During the same time period, the EISCAT radar observed sporadic enhancements in the F-region backscatter echo power, which suggests the presence of low-energy electron (1 keV or lower) precipitation coinciding with increase in amplitude of the electromagnetic wave (at the order of 10 Hz or higher). While we have not yet identified the dominant mechanism causing the fluctuations in FPI-derived wind velocity during the pulsating aurora, the frictional heating energy dissipated by the electric-field perturbations may be responsible for the increase in ionospheric thermal energy thus modifying the local wind dynamics in the lower thermosphere. Article in Journal/Newspaper EISCAT Tromsø Directory of Open Access Journals: DOAJ Articles Norway Tromsø Annales Geophysicae 28 10 1847 1857 |
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 S. Oyama K. Shiokawa J. Kurihara T. T. Tsuda S. Nozawa Y. Ogawa Y. Otsuka B. J. Watkins Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, Norway |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Simultaneous observations were conducted with a Fabry-Perot Interferometer (FPI) at a wavelength of 557.7 nm, an all-sky camera at a wavelength of 557.7 nm, and the European Incoherent Scatter (EISCAT) UHF radar during the Dynamics and Energetics of the Lower Thermosphere in Aurora 2 (DELTA-2) campaign in January 2009. This paper concentrated on two events during periods of pulsating aurora. The lower-thermospheric wind velocity measured with the FPI showed obvious fluctuations in both vertical and horizontal components. Of particular interest is that the location of the fluctuations was found in a darker area that appeared within the pulsating aurora. During the same time period, the EISCAT radar observed sporadic enhancements in the F-region backscatter echo power, which suggests the presence of low-energy electron (1 keV or lower) precipitation coinciding with increase in amplitude of the electromagnetic wave (at the order of 10 Hz or higher). While we have not yet identified the dominant mechanism causing the fluctuations in FPI-derived wind velocity during the pulsating aurora, the frictional heating energy dissipated by the electric-field perturbations may be responsible for the increase in ionospheric thermal energy thus modifying the local wind dynamics in the lower thermosphere. |
format |
Article in Journal/Newspaper |
author |
S. Oyama K. Shiokawa J. Kurihara T. T. Tsuda S. Nozawa Y. Ogawa Y. Otsuka B. J. Watkins |
author_facet |
S. Oyama K. Shiokawa J. Kurihara T. T. Tsuda S. Nozawa Y. Ogawa Y. Otsuka B. J. Watkins |
author_sort |
S. Oyama |
title |
Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, Norway |
title_short |
Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, Norway |
title_full |
Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, Norway |
title_fullStr |
Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, Norway |
title_full_unstemmed |
Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, Norway |
title_sort |
lower-thermospheric wind fluctuations measured with an fpi during pulsating aurora at tromsø, norway |
publisher |
Copernicus Publications |
publishDate |
2010 |
url |
https://doi.org/10.5194/angeo-28-1847-2010 https://doaj.org/article/9c629a0e9f224642ba4d3fc3148b956a |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
EISCAT Tromsø |
genre_facet |
EISCAT Tromsø |
op_source |
Annales Geophysicae, Vol 28, Pp 1847-1857 (2010) |
op_relation |
https://www.ann-geophys.net/28/1847/2010/angeo-28-1847-2010.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-28-1847-2010 0992-7689 1432-0576 https://doaj.org/article/9c629a0e9f224642ba4d3fc3148b956a |
op_doi |
https://doi.org/10.5194/angeo-28-1847-2010 |
container_title |
Annales Geophysicae |
container_volume |
28 |
container_issue |
10 |
container_start_page |
1847 |
op_container_end_page |
1857 |
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1766400161942077440 |