Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa23a1776e&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA23A-1776
Physics
[0394] Atmospheric Composition And Structure / Instruments And Techniques
Scientific paper
The Doppler Asymmetric Spatial Heterodyne (DASH) concept has recently been proposed to measure upper atmospheric winds. The DASH approach is identical to the concept of Spatial Heterodyne Spectroscopy (SHS) except that one interferometer arm exhibits an additional optical path offset, similar to the phase stepping Michelson technique which was used for the WINDII (Wind Imaging Interferometer) experiment. DASH therefore can be viewed as an optical remote sensing concept that is a hybrid of these two interferometric techniques. Its advantages include no moving parts, high sensitivity, and the ability to simultaneously observe a known light source for real time calibration. Both SHS and phase stepping Michelson instruments have already flown successfully on Earth orbiting satellites (SHIMMER on STPSat-1, WINDII on UARS) and DASH has been demonstrated successfully in the laboratory, which provides significant heritage for DASH. To further mitigate the risk of a future DASH satellite instrument, we built a brassboard DASH instrument, that is capable of measuring thermospheric winds from the ground, using the atomic oxygen red line emission OI(3P-1D) at λ=630nm. Such ground based Doppler shift measurements are routinely performed at many ground stations across the globe, typically using Fabry-Perot interferometers. A ground based DASH instrument gives us the opportunity to demonstrate thermospheric wind measurements using an atmospheric emission feature that is also suitable for space borne measurements. We will present the design of the Redline DASH Demonstration Instrument (REDDI) and the results of the initial ground based thermospheric wind observations. These successful ground based observations further increase the maturity of the DASH technique.
Babcock David D.
Emmert John T.
Englert Christoph R.
Harlander Jens
Roesler Fred L.
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