Download or read book Reviving a Doppler Asymmetric Spatial Heterodyne Spectrometer for Observing Therospheric Winds written by Robert Kallio and published by . This book was released on 2018 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Red-line DASH Demonstration Instrument (REDDI) was designed to prove that a Doppler Asymmetric Spatial Heterodyne (DASH) spectrometer could be used to accurately measure thermospheric winds by observing the Doppler shift of the 630nm emission of oxygen in the thermosphere. In 2015, we began a project to redesign the input optics of REDDI to repurpose the instrument from a demonstration unit to a long duration instrument. Integration of REDDI into the INSpIRe (Investigating Near-Space Interaction Regions) trailer at Embry-Riddle Aeronautical University (ERAU), Daytona Beach, began in 2016 with assembly of the new input optics in 2017. REDDI and INSpIRe will remain at ERAU until full loadout and instrument checkout is completed in late 2018, at which time it will be moved to a dark site. After recovering from a serious camera malfunction, full testing of REDDI commenced in January 2018. Thermospheric oxygen was first detected on 31 January, with first lateral winds being measures on 6 February. In total 20 nights of data were observed from 31 January to 6 March 2018. Thermospheric wind magnitudes ranging from 50 to 200 m/s were detected most nights despite a challenging observation location and constantly changing weather conditions.

Download or read book Doppler Asymmetric Spatial Heterodyne Spectroscopy DASH Concept and Experimental Demonstration written by and published by . This book was released on 2007 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe the concept of Doppler asymmetric spatial heterodyne spectroscopy (DASH) and present a laboratory Doppler-shift measurement using an infrared laser line. DASH is a modification of spatial heterodyne spectroscopy optimized for high precision, high accuracy Doppler-shift measurements of atmospheric emission lines either from the ground or a satellite. We discuss DASH design considerations, field widening, thermal stability and tracking, noise propagation, advantages, and trade-offs. DASH interferometers do not require moving optical parts and can be built in rugged, compact packages, making them suitable for space flight and mobile ground instrumentation.