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Proceedings Paper

Satellite instrument to measure stratospheric winds
Author(s): Neil Rowlands; Gary J. Buttner; A. Raab; Gordon G. Shepherd; William A. Gault; Mark W.P. Cann; S. Dobbie; Stoyan I. Sargoytchev; William E. Ward; Reza Mani; Yves J. Rochon; David W. Tarasick
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Paper Abstract

The Stratospheric Wind Interferometer for Transport Studies (SWIFT) is a satellite-born limb-viewing instrument which will be capable of globally measuring horizontal winds at altitudes of between 20 and 40 km with a precision of < 5 m/s, a vertical resolution of 2 km and a horizontal resolution on the order of a hundred km. SWIFT will map stratospheric dynamics. The data from the instrument will be important input for models which seek to predict the global distribution of stratospheric ozone. In addition, the SWIFT data will provide observational input to tropospheric weather models, which are currently being extended to the stratosphere. With global stratospheric wind data, these enhanced models have the potential to significantly improve weather forecasting in the troposphere. The instrument will observe a thermal emission line of an abundant atmospheric constituent near 8 micrometers using a field widened Michelson interferometer. A doppler shift of the emission line is detected as a phase shift at the output of the interferometer. A 2D array detector monitors the phase both perpendicular to and along the limb, thus mapping the velocity field. The fundamental feasibility of the instrument will be shown. The basic instrument requirements are described and the instrument parameters are derived from them. The instrument will utilize radiatively cooled optics and Stirling cycle coolers for the detector and filters. This instrument will be suitable for inclusion on a medium to large satellite with multiple instruments. The lack of cryogens is consistent with its intended use on the operational weather satellites of the future.

Paper Details

Date Published: 31 October 1996
PDF: 13 pages
Proc. SPIE 2830, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research II, (31 October 1996); doi: 10.1117/12.256103
Show Author Affiliations
Neil Rowlands, CAL Corp. (Canada)
Gary J. Buttner, CAL Corp. (Canada)
A. Raab, CAL Corp. (Canada)
Gordon G. Shepherd, York Univ. (Canada)
William A. Gault, York Univ. (Canada)
Mark W.P. Cann, York Univ. (Canada)
S. Dobbie, York Univ. (Canada)
Stoyan I. Sargoytchev, York Univ. (Canada)
William E. Ward, York Univ. (Canada)
Reza Mani, York Univ. (Canada)
Yves J. Rochon, York Univ. (Canada)
David W. Tarasick, Atmospheric Environment Services (Canada)


Published in SPIE Proceedings Vol. 2830:
Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research II
Paul B. Hays; Jinxue Wang, Editor(s)

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