Case study of a mesospheric wall event over Ferraz station, Antarctica (62° S)
On 16–17 July 2007 during an observational campaign at Comandante Ferraz Antarctic Station (62° S, 58° W), a mesospheric wall was observed with an airglow all-sky imager. The wave appeared like an extensive dark region in the all-sky airglow images, with a large depletion in the OH emission. Sim...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2011-01-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/29/209/2011/angeo-29-209-2011.pdf |
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| author | J. V. Bageston J. V. Bageston C. M. Wrasse C. M. Wrasse R. E. Hibbins R. E. Hibbins P. P. Batista P. P. Batista D. Gobbi D. Gobbi H. Takahashi H. Takahashi V. F. Andrioli V. F. Andrioli J. Fechine J. Fechine C. M. Denardini C. M. Denardini |
| author_facet | J. V. Bageston J. V. Bageston C. M. Wrasse C. M. Wrasse R. E. Hibbins R. E. Hibbins P. P. Batista P. P. Batista D. Gobbi D. Gobbi H. Takahashi H. Takahashi V. F. Andrioli V. F. Andrioli J. Fechine J. Fechine C. M. Denardini C. M. Denardini |
| author_sort | J. V. Bageston |
| collection | DOAJ |
| description | On 16–17 July 2007 during an observational campaign at Comandante
Ferraz Antarctic Station (62° S, 58° W), a
mesospheric wall was observed with an airglow all-sky imager. The wave
appeared like an extensive dark region in the all-sky airglow images, with a
large depletion in the OH emission. Simultaneous mesospheric winds measured
with a MF radar at Rothera station and temperature profiles from SABER
instrument, on board of TIMED satellite, were used to obtain the propagation
condition of the wave. Wind measurements during four days, around the time of
observation of the wave, are presented in order to discuss the type and
consistence of the duct in which this wave was propagating. By using wavelet
analysis and tidal amplitude components we found that 12 and 8 h
components were the most important periodicities around the time interval of
the wave observation. A collocated imaging spectrometer, for mesospheric
temperature measurements, has been operated simultaneously with the all-sky
imager. Direct effects of the mesospheric front have been seen in the
spectrometric measurements, showing an abrupt decrease in both OH intensity
and rotational temperature when the wave front passes overhead. The main
contribution of the present work is the investigation of the type of duct in
which the wall event was propagating. We found evidences for a thermal duct
structure to support the mesospheric wall propagation. This result was
obtained by two types of analysis: (a) the tidal components analysis and
winds filtering (harmonic analysis), and (b) comparison between the terms of
the <I>m</I><sup>2</sup> dispersion relation. |
| first_indexed | 2024-12-23T05:17:33Z |
| format | Article |
| id | doaj.art-761ef8a148894cd1a6be581f8d47abd0 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-23T05:17:33Z |
| publishDate | 2011-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-761ef8a148894cd1a6be581f8d47abd02022-12-21T17:58:47ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762011-01-012920921910.5194/angeo-29-209-2011Case study of a mesospheric wall event over Ferraz station, Antarctica (62° S)J. V. Bageston0J. V. Bageston1C. M. Wrasse2C. M. Wrasse3R. E. Hibbins4R. E. Hibbins5P. P. Batista6P. P. Batista7D. Gobbi8D. Gobbi9H. Takahashi10H. Takahashi11V. F. Andrioli12V. F. Andrioli13J. Fechine14J. Fechine15C. M. Denardini16C. M. Denardini17Instituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, BrazilColorado Research Associates (CoRA), NorthWest Research Associates (NWRA), Boulder, USAVale Soluções em Energia (VSE), São José dos Campos, BrazilColorado Research Associates (CoRA), NorthWest Research Associates (NWRA), Boulder, USABritish Antarctic Survey (BAS), Cambridge, UK, and Norwegian University of Science and Technology (NTNU), Trondheim, NorwayColorado Research Associates (CoRA), NorthWest Research Associates (NWRA), Boulder, USAInstituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, BrazilColorado Research Associates (CoRA), NorthWest Research Associates (NWRA), Boulder, USAInstituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, BrazilColorado Research Associates (CoRA), NorthWest Research Associates (NWRA), Boulder, USAInstituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, BrazilColorado Research Associates (CoRA), NorthWest Research Associates (NWRA), Boulder, USAInstituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, BrazilColorado Research Associates (CoRA), NorthWest Research Associates (NWRA), Boulder, USAUniversidade Federal de Campina Grande (UFCG), Campina Grande, BrazilColorado Research Associates (CoRA), NorthWest Research Associates (NWRA), Boulder, USAInstituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, BrazilColorado Research Associates (CoRA), NorthWest Research Associates (NWRA), Boulder, USAOn 16–17 July 2007 during an observational campaign at Comandante Ferraz Antarctic Station (62° S, 58° W), a mesospheric wall was observed with an airglow all-sky imager. The wave appeared like an extensive dark region in the all-sky airglow images, with a large depletion in the OH emission. Simultaneous mesospheric winds measured with a MF radar at Rothera station and temperature profiles from SABER instrument, on board of TIMED satellite, were used to obtain the propagation condition of the wave. Wind measurements during four days, around the time of observation of the wave, are presented in order to discuss the type and consistence of the duct in which this wave was propagating. By using wavelet analysis and tidal amplitude components we found that 12 and 8 h components were the most important periodicities around the time interval of the wave observation. A collocated imaging spectrometer, for mesospheric temperature measurements, has been operated simultaneously with the all-sky imager. Direct effects of the mesospheric front have been seen in the spectrometric measurements, showing an abrupt decrease in both OH intensity and rotational temperature when the wave front passes overhead. The main contribution of the present work is the investigation of the type of duct in which the wall event was propagating. We found evidences for a thermal duct structure to support the mesospheric wall propagation. This result was obtained by two types of analysis: (a) the tidal components analysis and winds filtering (harmonic analysis), and (b) comparison between the terms of the <I>m</I><sup>2</sup> dispersion relation.https://www.ann-geophys.net/29/209/2011/angeo-29-209-2011.pdf |
| spellingShingle | J. V. Bageston J. V. Bageston C. M. Wrasse C. M. Wrasse R. E. Hibbins R. E. Hibbins P. P. Batista P. P. Batista D. Gobbi D. Gobbi H. Takahashi H. Takahashi V. F. Andrioli V. F. Andrioli J. Fechine J. Fechine C. M. Denardini C. M. Denardini Case study of a mesospheric wall event over Ferraz station, Antarctica (62° S) Annales Geophysicae |
| title | Case study of a mesospheric wall event over Ferraz station, Antarctica (62° S) |
| title_full | Case study of a mesospheric wall event over Ferraz station, Antarctica (62° S) |
| title_fullStr | Case study of a mesospheric wall event over Ferraz station, Antarctica (62° S) |
| title_full_unstemmed | Case study of a mesospheric wall event over Ferraz station, Antarctica (62° S) |
| title_short | Case study of a mesospheric wall event over Ferraz station, Antarctica (62° S) |
| title_sort | case study of a mesospheric wall event over ferraz station antarctica 62 deg s |
| url | https://www.ann-geophys.net/29/209/2011/angeo-29-209-2011.pdf |
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