Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa51a1550a&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA51A-1550
Physics
2494 Instruments And Techniques, 2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 7949 Ionospheric Storms (2441)
Scientific paper
NSF is sponsoring a new facility to provide global, continuous determination of the Birkeland current system using the Iridium satellite constellation. The Iridium network consists of 66 satellites in 780-km altitude, circular, near-polar orbits, which are evenly distributed among six equally-spaced orbit planes. The satellites in each orbit plane are spaced by nine minutes along track. The avionics of every satellite includes a vector magnetometer that is sensitive enough to detect the magnetic perturbations of the Birkeland currents. While the magnetometers are read rapidly on-board, only one vector sample per satellite is transmitted to the ground once every 200 seconds for engineering monitoring. The corresponding latitude spacing is about 15 degrees, whereas degree-scale resolution is required to resolve the Birkeland currents. AMPERE will achieve a 100-fold increase in the amount of data sent to the ground, thus allowing us to derive global Birkeland current distributions with sub-degree latitude resolution every nine minutes. Because the data are transmitted via the satellite network, data products will be available continuously in very-near-real time, within 20 minutes of on orbit data acquisition. By providing 24/7 real-time observations of the Birkeland currents with global coverage throughout all ranges of geomagnetic activity, AMPERE will be the first-ever facility to monitor the electrodynamic state of the magnetosphere-ionosphere system throughout geomagnetic storms. The system architecture, data products, and operation plans will be discussed together with the development tasks, schedule, and status.
Anderson Benjamin J.
Barnes R. M.
Korth Haje
Waters Colin L.
Weiss Michele B.
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