Statistics – Methodology
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11a1692k&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM11A-1692
Statistics
Methodology
[2403] Ionosphere / Active Experiments, [2409] Ionosphere / Current Systems, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics
Scientific paper
The Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) uses the constellation of Iridium Communications satellites in 780-km-altitude, circular, near-polar orbits to monitor the electro-dynamic coupling of the ionosphere to the surrounding space environment in real time. The constellation consists of 66 satellites plus on-orbit spares, and each satellite carries a magnetometer for attitude determination. The magnetometer data are continuously sent from Iridium Satellite Network Operations Center to the AMPERE Science Data Center, where they are processed to extract the magnetic perturbation signatures associated with the Birkeland currents. This is accomplished by first merging real-time telemetry packets from each satellite into time-ordered sets of records, formatting and compiling a database. Subsequent processing automatically evaluates baselines, inter-calibrates magnetic field data between satellites, and quantifies the magnetic field residuals with the goal to reduce errors to the 30-nT digitization resolution of the magnetometers. The magnetic field residuals are then used to rank the quality of the data from the individual satellites and weight the data in subsequent science processing. Because magnetic fields generated by the Birkeland currents represent typically less than one percent of the total magnetic field, numerous challenges must be overcome to derive reliable magnetic perturbation signals. For example, corrections to the IGRF magnetic field model must be applied and adverse effects due to missing data must be mitigated. In the final processing step the Birkeland currents are derived by applying Ampere's law to the spherical harmonic fit of the perturbation data. We present the processing methodology, discuss the sensitivity of the Birkeland currents on the accuracy of the derived magnetic perturbations, and show a preliminary analysis of the 3-5 August 2010 geomagnetic storm.
Anderson Brandon
Barnes James R.
Dyrud Lars
Korth Haje
Waters Colin L.
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