SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structure
A new all-sky Fabry-Perot Interferometer called the Scanning Doppler Imager (SCANDI) was built and installed at Longyearbyen in December 2006. Observations have been made of the Doppler shifts and Doppler broadening of the 630 nm airglow and aurora, from which upper thermospheric winds and tempe...
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Copernicus Publications
2010-02-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/28/549/2010/angeo-28-549-2010.pdf |
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doaj-060978eafd334c48b2bc6fe407775cd02020-11-24T22:51:56ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762010-02-012854956710.5194/angeo-28-549-2010SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structureA. L. Aruliah0E. M. Griffin1H.-C. I. Yiu2I. McWhirter3A. Charalambous4Atmospheric Physics Laboratory, University College London, Gower Street, London WC1E 6BT, UKAtmospheric Physics Laboratory, University College London, Gower Street, London WC1E 6BT, UKAtmospheric Physics Laboratory, University College London, Gower Street, London WC1E 6BT, UKAtmospheric Physics Laboratory, University College London, Gower Street, London WC1E 6BT, UKAtmospheric Physics Laboratory, University College London, Gower Street, London WC1E 6BT, UKA new all-sky Fabry-Perot Interferometer called the Scanning Doppler Imager (SCANDI) was built and installed at Longyearbyen in December 2006. Observations have been made of the Doppler shifts and Doppler broadening of the 630 nm airglow and aurora, from which upper thermospheric winds and temperatures are calculated. SCANDI allows measurements over a field-of-view (FOV) with a horizontal radius of nearly 600 km for observations at an altitude of 250 km using a time resolution of 8 min. The instrument provides the ability to observe thermospheric spatial structure within a FOV which overlaps that of the EISCAT Svalbard radar and CUTLASS SuperDARN radars. Coordinating with these instruments provides an important opportunity for studying ion-neutral coupling. The all-sky image is divided into several sectors to provide a horizontal spatial resolution of between 100–300 km. This is a powerful extension in observational capability but requires careful calibration and data analysis, as described here. Two observation modes were used: a fixed and a scanning etalon gap. SCANDI results are corroborated using the Longyearbyen single look direction FPI, and ESR measurements of the ion temperatures. The data show thermospheric temperature gradients of a few Kelvins per kilometre, and a great deal of meso-scale variability on spatial scales of several tens of kilometres.https://www.ann-geophys.net/28/549/2010/angeo-28-549-2010.pdf |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
A. L. Aruliah E. M. Griffin H.-C. I. Yiu I. McWhirter A. Charalambous |
| spellingShingle |
A. L. Aruliah E. M. Griffin H.-C. I. Yiu I. McWhirter A. Charalambous SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structure Annales Geophysicae |
| author_facet |
A. L. Aruliah E. M. Griffin H.-C. I. Yiu I. McWhirter A. Charalambous |
| author_sort |
A. L. Aruliah |
| title |
SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structure |
| title_short |
SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structure |
| title_full |
SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structure |
| title_fullStr |
SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structure |
| title_full_unstemmed |
SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structure |
| title_sort |
scandi – an all-sky doppler imager for studies of thermospheric spatial structure |
| publisher |
Copernicus Publications |
| series |
Annales Geophysicae |
| issn |
0992-7689 1432-0576 |
| publishDate |
2010-02-01 |
| description |
A new all-sky Fabry-Perot Interferometer called the Scanning Doppler Imager
(SCANDI) was built and installed at Longyearbyen in December 2006.
Observations have been made of the Doppler shifts and Doppler broadening of
the 630 nm airglow and aurora, from which upper thermospheric winds and
temperatures are calculated. SCANDI allows measurements over a field-of-view
(FOV) with a horizontal radius of nearly 600 km for observations at an
altitude of 250 km using a time resolution of 8 min. The instrument
provides the ability to observe thermospheric spatial structure within a FOV
which overlaps that of the EISCAT Svalbard radar and CUTLASS SuperDARN
radars. Coordinating with these instruments provides an important
opportunity for studying ion-neutral coupling. The all-sky image is divided
into several sectors to provide a horizontal spatial resolution of
between 100–300 km. This is a powerful extension in observational capability
but requires careful calibration and data analysis, as described here. Two
observation modes were used: a fixed and a scanning etalon gap. SCANDI
results are corroborated using the Longyearbyen single look direction FPI,
and ESR measurements of the ion temperatures. The data show thermospheric
temperature gradients of a few Kelvins per kilometre, and a great deal of
meso-scale variability on spatial scales of several tens of kilometres. |
| url |
https://www.ann-geophys.net/28/549/2010/angeo-28-549-2010.pdf |
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