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WAMDII: wide-angle Michelson Doppler imaging interferometer for Spacelab.
G G Shepherd1, W A Gault, D W Miller
1York University, Centre for Research in Experimental Space Science, Toronto M3J 1P3.
A new Wide-Angle Michelson Doppler Imaging Interferometer (WAMDII) measures upper atmospheric winds and temperatures using visible light emissions. This instrument provides detailed atmospheric data from space.
Area of Science:
- Aeronomy and atmospheric physics.
- Optical instrumentation and remote sensing.
Background:
- Measuring upper atmospheric dynamics is crucial for understanding space weather and climate.
- Existing methods often lack the spatial or spectral resolution required for detailed analysis.
Purpose of the Study:
- To introduce and validate the Wide-Angle Michelson Doppler Imaging Interferometer (WAMDII) for remote sensing of the upper atmosphere.
- To demonstrate the instrument's capability in measuring wind, temperature, and emission rates from visible emissions.
Main Methods:
- Utilized a Spacelab platform for space-based measurements.
- Employed an achromatic, field-widened Michelson interferometer design.
- Generated full velocity, temperature, and emission rate images using four phase-stepped images.
Main Results:
- Achieved a 1-second exposure time for a 5 kR emission rate with 85 x 105 pixel binning.
- Successfully conducted laboratory tests and field measurements using auroral emissions.
- Demonstrated the instrument's effectiveness in capturing atmospheric phenomena.
Conclusions:
- The Wide-Angle Michelson Doppler Imaging Interferometer (WAMDII) is a viable instrument for upper atmospheric remote sensing.
- The instrument's design offers good thermal stability and efficient data acquisition.
- WAMDII provides valuable data for studying atmospheric dynamics and phenomena.
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