MAPPING THERMOSPHERIC WINDS IN THE AURORAL-ZONE

A new all-sky imaging Fabry-Perot (ASIFP) spectrometer has been develo ped for groundbased mapping of upper atmospheric wind and temperature fields in the auroral zone. Although several other ASIFP spectrometers exist for atmospheric studies [Rees et al., 1984; Sekar et al., 1993; Biondi et al., 1995] these instruments have all operated with etalons of fixed optical gap, a method potentially subject to errors in the p resence of auroral intensity gradients. In this instrument the etalon plate spacing is scanned periodically over one order of interference a nd each photon detected is assigned to a wavelength interval which is determined from both its arrival location on the detector and the etal on plate spacing prevailing at the detection time. Spectra accumulated this way are not distorted by spatial intensity gradients. Preliminar y lambda 630 nm observations were made during the winter of 1994/95 fr om Poker Flat Research Range, Alaska, To illustrate some of the featur es we have observed in this study we present line-of-sight wind estima tes derived for the night of December 7, 1994. The background wind mat ches averages presented previously by Sica et al. [1986] and is consis tent with winds driven principally by momentum deposition from ionosph eric plasma convection through ion-drag. Smaller scale curvature and d ivergence features are also discernable and are discussed.