Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa32a..02b&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA32A-02
Physics
0310 Airglow And Aurora, 2400 Ionosphere (6929), 2415 Equatorial Ionosphere, 2443 Midlatitude Ionosphere, 2494 Instruments And Techniques
Scientific paper
The Tiny Ionospheric Photometer (TIP) sensors aboard the Constellation Observing System for Meterology, Ionosphere and Climate (COSMIC) spacecraft comprise a suite of six nadir-viewing ultraviolet photometers for characterizing the Earth's nightside ionosphere. The TIP instruments complement the ionospheric capabilities of the GPS occultation experiment (GOX) by characterizing horizontal ionospheric density gradients. These photometers target OI~135.6~nm emission produced by ionospheric O++e recombination and measure ionospheric structure with a spatial resolution of 10--30~km. These instruments have a simple design which excludes OI~130.4~nm emisssion and achieves a sensitivity of greater than 300~counts/s/Rayleigh at 135.6~nm. The satellites initially orbited in the same plane at 500~km, altitude, and over the course of 13 months they are being individually raised to their final 800 km orbits in six planes separated by 24--30° in right ascension. This provides opportunities for cross-calibration among the sensors, for multi-pass observations as the satellites orbit together early in the mission, for observations at different spatial resolutions as the spacecraft operate at different altitudes, and ultimately for global ionospheric monitoring at various local times. The TIP instruments focus on characterizing the horizontal gradients of the nightside electron density. We present early results showing the horizontal structure of the nightside ionosphere at different local times, including ionospheric depletions that appear to be associated with scintillation. TIP data and basic Level 1 data products are processed and disseminated by the COSMIC Data Analysis and Archive Center (CDAAC) at UCAR. Additionally, advanced algorithms and higher-level data products are generated and disseminated by the TIP operations center at NRL, including ionospheric morphology products, simple ionospheric electron densities, and combined GOX/TIP data products. COSMIC data will also be incorporated into the Utah State University Global Assimilation of Ionospheric Measurements (GAIM) model operating at NRL.
Budzien Scott A.
Chua Damien H.
Coker Clayton
Dymond Ken F.
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