Development of four Fabry-Perot interferometers for measurements of thermospheric wind and temperature

We are developing four Fabry-Perot interferometers (FPIs) to measure winds and temperatures in the thermosphere and winds in the mesosphere through airglow/aurora emissions at wavelengths of 558 nm and 630 nm. One FPI with 116mm-diameter etalon (d=15mm, 558 nm and 630 nm) was installed at the EISCAT Tromso site on January 2009 for coordinated measurements with the EISCAT radar. The other three FPIs with 70mm-diameter etalons (d=15mm, 630 nm only) will be installed in Japan, Indonesia, and Australia for wind and temperature measurements at conjugate middle latitudes and at the equator. These FPIs use low-noise cooled-CCDs with 1024x1024 pixels and 4-stage thermoelectric cooling system which can cool the CCD temperature down to -80C. The large maximum incident angle (1.3-1.4 degree) to the etalon increases the sensitivity of the FPIs. In the presentation, we describe details of these instrumentations and results of test observations at Tromso, Norway, and Shigaraki, Japan.