HR: 1400h
AN: SA33B-07    [Abstracts]
TI: Midlatitude Nighttime hmF2 and NmF2 Retrieval from TIMED/GUVI Disk Measurements
AU: * Comberiate, J M
EM: Joseph.Comberiate@jhuapl.edu
AF: Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road MP3- W189, Laurel, MD 20723, United States
AU: Paxton, L J
EM: Larry.Paxton@jhuapl.edu
AF: Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road MP3- W189, Laurel, MD 20723, United States
AB: Since its launch on-board the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite in December 2001, the Global Ultraviolet Imager (GUVI) has over five years of observations of the global ionosphere. These observations span all local times and large variations in solar and geomagnetic activity. Multi- dimensional electron density profiles can be tomographically reconstructed from ultraviolet brightness observations of the nightside ionosphere. An existing tomographic model has been modified to optimally retrieve hmF2 and NmF2 from GUVI disk measurements despite the low signal-to-noise ratio of UV observations of the midlatitude ionosphere. This information is relevant for use in climatological and data assimilation models. After the forward model and retrieval method are described, results over five years of GUVI data are presented along with an error analysis and validation with incoherent scatter radar measurements and ionosonde profiles.
DE: 2443 Midlatitude ionosphere
DE: 6929 Ionospheric physics (1240, 2400)
DE: 6969 Remote sensing
DE: 6982 Tomography and imaging (7270, 8180)
DE: 6994 Instruments and techniques (1241)
SC: SPA-Aeronomy [SA]
MN: 2007 Joint Assembly