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) c...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2010-10-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/28/1847/2010/angeo-28-1847-2010.pdf |
| _version_ | 1819292471381721088 |
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| author | S. Oyama S. Oyama K. Shiokawa J. Kurihara J. Kurihara T. T. Tsuda S. Nozawa Y. Ogawa Y. Otsuka B. J. Watkins |
| author_facet | S. Oyama S. Oyama K. Shiokawa J. Kurihara J. Kurihara T. T. Tsuda S. Nozawa Y. Ogawa Y. Otsuka B. J. Watkins |
| author_sort | S. Oyama |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-24T03:55:03Z |
| format | Article |
| id | doaj.art-9c629a0e9f224642ba4d3fc3148b956a |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-24T03:55:03Z |
| publishDate | 2010-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-9c629a0e9f224642ba4d3fc3148b956a2022-12-21T17:16:29ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762010-10-01281847185710.5194/angeo-28-1847-2010Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, NorwayS. Oyama0S. Oyama1K. Shiokawa2J. Kurihara3J. Kurihara4T. T. Tsuda5S. Nozawa6Y. Ogawa7Y. Otsuka8B. J. Watkins9Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, JapanGeophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, USASolar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, JapanSolar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Japannow at: Graduate School of Science, Hokkaido University, Sapporo, JapanSolar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, JapanSolar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, JapanNational Institute of Polar Research, Tokyo, JapanSolar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, JapanGeophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, USASimultaneous 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.https://www.ann-geophys.net/28/1847/2010/angeo-28-1847-2010.pdf |
| spellingShingle | S. Oyama S. Oyama K. Shiokawa J. Kurihara 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 Annales Geophysicae |
| title | 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_short | 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 tromso norway |
| url | https://www.ann-geophys.net/28/1847/2010/angeo-28-1847-2010.pdf |
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