AMPERE: Project Implementation Overview and Initial Results (Invited)

Details AMPERE: Project Implementation Overview and Initial Results (Invited) AMPERE: Project Implementation Overview and Initial Results (Invited)

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21c..01a&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM21C-01

Physics

[2407] Ionosphere / Auroral Ionosphere, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions

Scientific paper

The Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE) uses the constellation of Iridium Communications satellites in 780-km-altitude, circular, polar orbits to monitor the electro-dynamic coupling of the ionosphere to the surrounding space environment in real time.The first critical phase in developing AMPERE has been completed with the deployment of new flight software on the entire constellation which increases the acquisition rate of the magnetometer data. The software implements a new telemetry path devoted to AMPERE magnetometer data to transmit 10 to 100 times more magnetometer data to the ground. In normal mode, every satellite returns one vector magnetic field sample every 19.44 seconds. In high rate, the sampling interval is reduced to 2.16 seconds. Attitude and ephemeris data required to process the magnetic field data are also received. AMPERE data acquisition, performed by the Boeing operations team supporting Iridium’s fleet, began on 1 June 2010 from the 66 operational satellites and on-orbit spares and has achieved better than 99% temporal coverage. Test data were also acquired from October 2009 through May 2010. AMPERE data are downlinked in real-time via the Iridium Communications satellite network and ingested by the AMPERE ground data system at the Iridium Satellite Network Operations Center. The magnetometer data are transmitted to the AMPERE Science Data Center (SDC) at The Johns Hopkins University Applied Physics Laboratory within minutes of receipt from orbit. These data are processed in the SDC to derive magnetic residuals by applying corrections for magnetometer orientation and gain and removing the Earth’s main field. The resulting vector magnetic field residuals primarily reflect the signatures of the Birkeland currents. AMPERE high-rate data were acquired for the 3-5 August 2010 geomagnetic storm, allowing assessement of the global Birkeland current system development throughout the storm with sub-degree latitude resolution. The architecture and performance of the AMPERE system are reviewed, and initial results of the dynamics of storm-time and other time-variable currents are presented.

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