GUVI observations of the ionosphere during the declining phase of the solar cycle

Details GUVI observations of the ionosphere during the declining phase of the solar cycle GUVI observations of the ionosphere during the declining phase of the solar cycle

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa31b..04p&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA31B-04

Physics

0355 Thermosphere: Composition And Chemistry, 2415 Equatorial Ionosphere, 2419 Ion Chemistry And Composition (0335), 2443 Midlatitude Ionosphere, 2494 Instruments And Techniques

Scientific paper

GUVI has established a remarkable record of observations of the ionosphere since its launch in December 2001. By and large, these observations were recorded in what we call "imaging" mode. In that a scan mirror directs the instrument line of sight from horizon to horizon. On just about the sixth anniversary of the launch of TIMED, the GUVI scan mechanism failed. This remarkable motor and gearbox made over 10 million cycles over 140 degrees of rotation. Since that time GUVI has been operated in "spectrograph" mode. In spectrograph mode the scan mirror is held fixed and the instrument records and downlinks the entire spectrum. This mode is of interest to the community because it provides a new view of the ionosphere: we now have the signal to noise ratio to make observations of the solar minimum ionosphere at high spatial resolution on the disk; we have observed MSTIDs and we have observed the signature of nitric oxide (NO). NO is an important constituent of the lower thermosphere. One of the most interesting observations at solar minimum is that we have been able to observe NO as well as O+ under a variety of conditions. One of the more interesting situations is that it appears that we are able to see a change in the distribution of NO during Stratospheric Sudden Warmings. In this talk we discuss these new observations and the future of GUVI: in short, as long as the TIMED spacecraft works we should be able to continue to provide these observations as we continue to linger at solar minimum and on into the next solar cycle. In addition, we will look at the impact of high speed streams on the ionosphere as seen by GUVI.

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