Thermospheric wind field over Mawson and Davis, Antarctica; simultaneous observations by two Fabry–Perot spectrometers of λ630 nm emission

Greet, P. A.; Conde, M.; Dyson, P. L.; Innis, J. L.; Breed, A. M.; Murphy, D. J.

doi:10.1016/s1364-6826(99)00059-0

Cited by 27 publications

(25 citation statements)

References 29 publications

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“…The Mawson and Davis FPSs have been described elsewhere (Jacka et al, 1980;Jacka, 1985;Greet et al, 1999). The instruments are run routinely with observations of mesospheric and thermospheric emissions on a campaign basis.…”

Section: Instruments and Datamentioning

confidence: 99%

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Thermospheric vertical winds in the auroral oval/polar cap region

Greet

Innis²,

Dyson³

2002

Ann. Geophys.

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Variations in mean hourly thermospheric winds and λ630 nm emission intensities show at least three significant associations between mean vertical winds and the auroral oval. Mean vertical winds within the auroral oval are smaller than those outside the oval, particularly those in the polar cap. A downward wind associated with entry of the observing region into the auroral oval can be seen in both Mawson and Davis hourly mean vertical winds. Large vertical winds are seen poleward of the auroral oval/polar cap boundary, most significantly upward winds occur within ±2 hr of magnetic midnight. Under moderately quiet geomagnetic conditions Davis passes through the auroral oval into the polar cap in the evening, but at higher K p it passes into the polar cap earlier and larger, and more sustained mean vertical winds are observed.

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Section: Instruments and Datamentioning

confidence: 99%

“…The instruments are run routinely with observations of mesospheric and thermospheric emissions on a campaign basis. Instrument configuration and operation during 1997-1999 is as described by Greet et al (1999) and Innis et al (2001).…”

Section: Instruments and Datamentioning

confidence: 99%

Thermospheric vertical winds in the auroral oval/polar cap region

Greet

Innis²,

Dyson³

2002

Ann. Geophys.

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“…Ongoing development of all-sky imaging Fabry-Perot spectrometers (Rees and Greenaway, 1983;Rees et al, 1984;Batten et al, 1988;Sekar et al, 1993;Biondi et al, 1995;Griffin et al, 2008) has resulted in instruments capable of recording independent spectra from many tens of locations across the sky simultaneously, making it possible to investigate this structure directly. F-region winds and temperatures have been observed previously from Mawson station, Antarctica, using a singleetalon, separation scanned, non-imaging ("pinhole scanner") Fabry-Perot spectrometer (Wardill et al, 1987;Conde and Dyson, 1995a,b;Innis et al, 1996;Greet et al, 1999). The 630.0 nm line of atomic oxygen was observed, yielding estimates of conditions in the auroral F-region at a typical height of approximately 240 km.…”

Section: Introductionmentioning

confidence: 98%

Thermospheric winds and temperatures above Mawson, Antarctica, observed with an all-sky imaging, Fabry-Perot spectrometer

et al. 2009

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Abstract.A new all-sky imaging Fabry-Perot spectrometer has been installed at Mawson station (67 • 36 S, 62 • 52 E), Antarctica. This instrument is capable of recording independent spectra from many tens of locations across the sky simultaneously. Useful operation began in March 2007, with spectra recorded on a total of 186 nights. Initial analysis has focused on the large-scale daily and average behavior of winds and temperatures derived from observations of the 630.0 nm airglow line of atomic oxygen, originating from a broad layer centered around 240 km altitude, in the ionospheric F-region.The 1993 Horizontal Wind Model (HWM93), NRLMSISE-00 atmospheric model, and the Coupled Thermosphere/Ionosphere Plasmasphere (CTIP) model were used for comparison. During the geomagnetically quiet period studied, observed winds and temperatures were generally well modelled, although temperatures were consistently higher than NRLMSISE-00 predicted, by up to 100 K. CTIP temperatures better matched our data, particularly later in the night, but predicted zonal winds which were offset from those observed by 70-180 ms −1 westward. During periods of increased activity both winds and temperatures showed much greater variability over time-scales of less than an hour. For the active night presented here, a period of 45 min saw wind speeds decrease by around 180 ms −1 , and temperatures increase by approximately 100 K. Activeperiod winds were poorly modelled by HWM93 and CTIP, although observed median temperatures were in better agreement with NRLMSISE-00 during such periods.Average behavior was found to be generally consistent with previous studies of thermospheric winds above Mawson. The collected data set was representative of quiet geomagnetic and solar conditions. Geographic eastward windsCorrespondence to: C. Anderson (c.anderson@latrobe.edu.au) in the afternoon/evening generally continued until around local midnight, when winds turned equatorward. Geographic meridional and zonal winds in the afternoon were approximately 50 ms −1 weaker than expected from HWM93, as was the transition to equatorward flow around midnight. There was also a negligible geographic zonal component to the post-midnight wind where HWM93 predicted strong westward flow.

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“…However, for many years FPIs have provided direct measurements of the upper thermosphere that have shown meso-scale behaviour achieved using single FPIs, bistatic and tristatic FPI arrangements with single point measurements (e.g. Biondi et al, 1984;Greet et al, 1999;Aruliah et al, 2005, respectively). Attempts have been made to image the whole sky simultaneously using fixed gap etalons (e.g.…”

Section: Introductionmentioning

confidence: 99%

SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structure

et al. 2010

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Abstract.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.

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Thermospheric wind field over Mawson and Davis, Antarctica; simultaneous observations by two Fabry–Perot spectrometers of λ630 nm emission

Cited by 27 publications

References 29 publications

Thermospheric vertical winds in the auroral oval/polar cap region

Thermospheric vertical winds in the auroral oval/polar cap region

Thermospheric winds and temperatures above Mawson, Antarctica, observed with an all-sky imaging, Fabry-Perot spectrometer

SCANDI – an all-sky Doppler imager for studies of thermospheric spatial structure

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