Observations of the Solar Minimum Thermosphere Above Poker Flat, Alaska, with an All-Sky Imaging Fabry-Perot Spectrometer

Details Observations of the Solar Minimum Thermosphere Above Poker Flat, Alaska, with an All-Sky Imaging Fabry-Perot Spectrometer Observations of the Solar Minimum Thermosphere Above Poker Flat, Alaska, with an All-Sky Imaging Fabry-Perot Spectrometer

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa22a..03c&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA22A-03

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2494] Ionosphere / Instruments And Techniques

Scientific paper

The recent deep solar minimum conditions have provided an ideal opportunity to resolve how various external drivers perturb the state of Earth's thermosphere. Here, we present observations of thermospheric wind and temperature fields above Poker Flat, Alaska, during the 2007/08 and 2008/09 northern winters. These data were taken with an all-sky imaging Fabry-Perot spectrometer, that was recently upgraded to improve sensitivity and to allow interleaved observations of both the 6300A (red) and 5577A (green) emission in a single night. The multi-wavelength capability provides vertical resolution, whereas the observing cadence of 2-5 minutes allows determination of the ion-neutral coupling time constant. All-sky wind mapping resolves these responses horizontally, on scales down to 100 km or less. Even at solar minimum we often observed signatures of strong localized ion-neutral coupling; horizontal divergence and shear with magnitudes up to 0.0005 inverse seconds were not uncommon, even in the E-region. The quiescent conditions also allowed us to observe an approximately 3-week long cooling period in the F-region, following the stratospheric warming event of January/February 2009. The magnitude of this cooling was around 100K.

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