Application of the MiniME Fabry-Perot Interferometer to Studies of Low Latitude and Polar Thermospheric Dynamics

Details Application of the MiniME Fabry-Perot Interferometer to Studies of Low Latitude and Polar Thermospheric Dynamics Application of the MiniME Fabry-Perot Interferometer to Studies of Low Latitude and Polar Thermospheric Dynamics

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa41a..03m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-03

Physics

Optics

3369 Thermospheric Dynamics (0358), 3394 Instruments And Techniques

Scientific paper

A portable and inexpensive Fabry-Perot interferometer (FPI) called MiniME was installed at Arecibo Observatory in August 2005 to observe the Doppler widths and Doppler shifts for the 630-nm nightglow. The purpose of these observations is to study the dynamical behavior of the midnight temperature maximum (MTM) that causes a midnight reversal of the meridional wind and an increase of the temperature by amounts of 50 to 150 K. This instrument has an aperture of 42 mm and a spacer gap of 1.5 cm. The detector is a bare-CCD camera with an array of 1024x1024 pixels. The system transmission is enhanced by the use of AR-coated optics and a reflectivity of 77% for the etalon coatings. Thirteen orders of the 630-nm nightglow are observed in each image. The results of the application of the Levinberg-Marquardt non-linear least square analysis show that for the peak 630-nm intensity of 50-75 R observed during the "midnight collapse" caused by the passage of the MTM at 01 to 03 LT, the uncertainties in the line-of-sight wind and thermospheric temperature are 4 m/s and 20 K, respectively, for an exposure time of 180 seconds. Determination of winds for the meridional and zonal directions shows the expected behavior of eastward wind of 100 to 150 m/s combined with southward winds except during the MTM passage when there is a reversal to the northward direction. This instrument will be relocated during the summer of 2006 to Fairbanks, Alaska, for the support of the AMISR operations as a part of a tri-static FPI network with the other two sites located at Toolik Lake and Eagle. Further details regarding this network will be presented at the meeting.

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