GUVI Spectrograph Mode Observations of the Mid-Latitude Ionosphere

Details GUVI Spectrograph Mode Observations of the Mid-Latitude Ionosphere GUVI Spectrograph Mode Observations of the Mid-Latitude Ionosphere

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa51a1558c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA51A-1558

Physics

2439 Ionospheric Irregularities, 2443 Midlatitude Ionosphere, 2494 Instruments And Techniques, 6969 Remote Sensing, 6982 Tomography And Imaging (7270, 8180)

Scientific paper

GUVI has compiled nearly seven years of observations of the ionosphere since its launch in December 2001. Since 2007, 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 operationally useful 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. The increased effective sensitivity of GUVI at 135.6 nm in spectrograph mode has allowed us to observe the optical signature of medium-scale traveling ionospheric disturbances (MSTIDs). MSTIDs have been observed frequently by ground-based instruments but global space-based observations have been limited to date. We will present initial results including characterization of the spatial structure of MSTIDs observed along the GUVI orbit path as it precesses through varying longitudes and local times. GUVI data and data products are routinely provided to AFWA by APL; we will discuss ways to improve GUVI mid-latitude products for operational use.

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