Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21d..06m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM21D-06
Physics
2194 Instruments And Techniques, 2494 Instruments And Techniques, 2794 Instruments And Techniques, 5494 Instruments And Techniques, 6994 Instruments And Techniques (1241)
Scientific paper
For some 35 years Fabry-Perot interferometer (FPI) measurements in the auroral region have been carried out with a single ground-based observatory. The problem with this approach is that the three components of the neutral wind vector within the region observed along the line-of-sight cannot be determined. Only the radial motion of the emitting species of atomic oxygen atoms, O1D, can be determined for any single direction toward the auroral or airglow source region. This poses a problem in studying the polar ion-neutral coupling that takes place in the course of geostrophic adjustment at high latitudes. This process describes the thermospheric response to the changing forcing functions represented by the day-to-night pressure gradient, the Pedersen ion drag imposed upon the neutral atmosphere by the polar ionospheric plasma convection, and the thermospheric Joule and soft-particle heating sources. The balancing of these forcing functions is also influenced by the action of the Coriolis force modifying the flow field at high latitudes. To study these changes during the course of auroral sub-storm activity that enters into the ion-neutral coupling interaction of the thermosphere-ionosphere system, it is of great importance to measure the three components of the neutral wind vector within a common volume. This is especially true for the auroral region where the vertical wind cannot be assumed to be zero during auroral substorm events. Accordingly, a tri-static FPI network will be installed in central Alaska to support the AMISR radar facility, which would measure the thermospheric electric fields in the region of overlap with the common volume observed by the AkFPI network of three FPI observatories. The three FPI instruments will be installed in the three Alaskan locations of Eagle, Ft. Yukon, and Poker Flat, and first results are expected as of October, 2006. The FPI instruments are classified as imaging FPIs, and the sensitivities are expected to be 3-5 ms-1 and 15-20 K for the horizontal thermospheric wind speed and temperature for an integration period of 60 s and an auroral signal of 250 R.
Faivre Magalie
Hedden R.
Larsen Mark F.
Meriwether W. Jr. J.
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