Coordinated GUVI, ISR, and imaging observations of the auroral boundary over Sondrestrom

Details Coordinated GUVI, ISR, and imaging observations of the auroral boundary over Sondrestrom Coordinated GUVI, ISR, and imaging observations of the auroral boundary over Sondrestrom

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa62b0410d&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA62B-0410

Mathematics

Logic

0310 Airglow And Aurora, 2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2475 Polar Cap Ionosphere

Scientific paper

From its inception, the mission concept for the TIMED/GUVI instrument has included a series of experiments coordinated with ground-based radars and imagers. The 07 December 2001 TIMED launch and subsequent early turn on of GUVI has enabled a number of wintertime dark-moon campaigns with the Sondrestrom Facility. Of these experiments, the midnight sector GUVI overflight of 17-18 January 2002 presents an ideal ground-based conjunction with an auroral boundary arc nearly stationary at Sondrestrom's zenith. All-sky imagery at 630.0 nm (OI 1D) indicates that, following the dynamic expansion of an auroral boundary arc from the south to overhead, the location of the boundary emission gradiant remains relatively fixed some 6 minutes prior to and during GUVI's overflight. Sequential meridional ISR scans support the premise of a stable boundary with negligible morphological changes in Ne(alt,Λ ) over a 4 min scan period. ISR horizon-to-horizon scans and contextual all-sky imagery at 630.0 nm and 427.8 nm (N2+) allow direct measurement and estimates for GUVI key parameters such as the E-region electron density profile, auroral boundary location, electron energy flux, electron characteristic energy, and conductances. Ground-based and satellite measurements span a range of integration times (3 to 30 s) and horizontal spatial scales (2 km to 40 km) which must be reconciled with the variability of the aurora in order to yield useful comparisons. Herein, we present direct comparisons of ground-based and GUVI derived key parameters in the context of the intrinsic auroral temporal and spatial variability.

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