AMPERE Real-Time Data Reduction and Processing

Details AMPERE Real-Time Data Reduction and Processing AMPERE Real-Time Data Reduction and Processing

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa31a1954f&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA31A-1954

Physics

[2700] Magnetospheric Physics

Scientific paper

AMPERE: The Active Magnetosphere and Planetary Electrodynamics Response Experiment, uses a constellation of 66 satellites plus on-orbit spares that are part of the Iridium Communications network. The electro-dynamic coupling of the ionosphere to the surrounding space environment is monitored in real-time by magnetometers carried by each satellite for attitude determination at 780-km-altitude with circular, near-polar orbits. The magnetometer data are continuously sent from Iridium Satellite Network Operations Center to the AMPERE Science Data Center (SDC), where they are processed to extract the magnetic perturbation signatures associated with the Birkeland currents. Two processing chains have been implemented, definitive and real-time corresponding to two data streams derived from the space telemetry. The definitive methodology is derived from final telemetry data generated by merging the real-time and store-and-dump telemetry data to ensure against dropped telemetry frames and uses after-the-fact attitude and space vehicle orbit solutions that optimize the ephemeris data quality. These data are generated and delivered to the SDC within five days of on-orbit data acquisition. The definitive data processing yields magnetic field perturbations with error residuals near the 30-nT digitization resolution of the magnetometers, and uses one day of data to intercalibrate the magnetic field data against the IGRF model, evaluate baselines, and identify missing segments in data which are filled in by interpolation from ahead and behind space vehicles. The real-time telemetry are forwarded to the SDC immediately upon receipt in the operations center, typically within two minutes of the time the data packet is completed on orbit. The real-time data include on-board attitude and predicted orbit ephemerides. The real-time data processing chain uses intercalibrations against the IGRF model obtained from the previous day. Baseline determination is done using data window extending 24 hours prior to the current time. Gap filling uses only data from the satellite ahead (already acquired over a track segment with a gap) for interpolating over any data gaps. This data product is then used to derive the Birkeland currents by applying Ampere's law to the spherical harmonic fit of the perturbation data in the same fashion as the post-processed science quality data. We present the processing methodology and discuss the assumptions that underlie the accuracy of the derived real-time magnetic perturbations as compared to the standard full day processing results, and show an analysis of both geomagneticly quiet and active periods.

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