Polar cap mesosphere wind observations: comparisons of simultaneous measurements with a Fabry–Perot interferometer and a field-widened Michelson interferometer
- 20 August 2000
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 39 (24), 4284-4291
- https://doi.org/10.1364/ao.39.004284
Abstract
Polar cap mesospheric winds observed with a Fabry–Perot interferometer with a circle-to-line interferometer optical (FPI/CLIO) system have been compared with measurements from a field-widened Michelson interferometer optimized for E-region winds (ERWIN). Both instruments observed the Meinel OH emission emanating from the mesopause region (∼86 km) at Resolute Bay, Canada (74.9 °N, 94.9 °W). This is the first time, to our knowledge, that winds measured simultaneously from a ground-based Fabry–Perot interferometer and a ground-based Michelson interferometer have been compared at the same location. The FPI/CLIO and ERWIN instruments both have a capability for high temporal resolution (less than 10 min for a full scan in the four cardinal directions and the zenith). Statistical comparisons of hourly mean winds for both instruments by scatterplots show excellent agreement, indicating that the two optical techniques provide equivalent observations of mesopause winds. Small deviations in the measured wind can be ascribed to the different zenith angles used by the two instruments. The combined measurements illustrate the dominance of the 12-h wave in the mesopause winds at Resolute Bay, with additional evidence for strong gravity wave activity with much shorter periods (tens of minutes). Future operations of the two instruments will focus on observation of complementary emissions, providing a unique passive optical capability for the determination of neutral winds in the geomagnetic polar cap at various altitudes near the mesopause.Keywords
This publication has 39 references indexed in Scilit:
- Comparisons between Canadian prairie MF radars, FPI (green and OH lines) and UARS HRDI systemsAnnales Geophysicae, 1997
- Rayleigh lidar system for middle atmosphere research in the arcticOptical Engineering, 1997
- Tidal oscillations of the Arctic upper mesosphere and lower thermosphere in winterJournal of Geophysical Research, 1997
- Simultaneous mesospheric wind measurements near South Pole by optical and meteor radar methodsGeophysical Research Letters, 1996
- Validation of mesosphere and lower thermosphere winds from the high resolution Doppler imager on UARSJournal of Geophysical Research: Atmospheres, 1996
- Planetary wave disturbances in the Arctic winter mesopause over Eureka (80°N)Planetary and Space Science, 1994
- WINDII, the wind imaging interferometer on the Upper Atmosphere Research SatelliteJournal of Geophysical Research: Atmospheres, 1993
- The high‐resolution doppler imager on the Upper Atmosphere Research SatelliteJournal of Geophysical Research: Atmospheres, 1993
- Large‐scale waves in the upper‐mesosphere at Antarctic high‐latitudesGeophysical Research Letters, 1992
- Neutral winds in the lower thermosphere from Dynamics Explorer 2Geophysical Research Letters, 1992