Plasma Density and Magnetic Field Strength Measured in the Earth's Plasmasphere by the Mutual Impedance Probe Onboard the Rosetta Spacecraft

Details Plasma Density and Magnetic Field Strength Measured in the Earth's Plasmasphere by the Mutual Impedance Probe Onboard the Rosetta Spacecraft Plasma Density and Magnetic Field Strength Measured in the Earth's Plasmasphere by the Mutual Impedance Probe Onboard the Rosetta Spacecraft

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11b0307t&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM11B-0307

Physics

2768 Plasmasphere, 2794 Instruments And Techniques, 6939 Magnetospheric Physics (2700)

Scientific paper

During its first planetary gravity assistance, in early March 2005, the European Space Agency's Rosetta spacecraft entered the Earth's plasmasphere, a region dominated by a strong magnetized and dense cold plasma. The mutual impedance probe, MIP, and the 4 other instruments of the Rosetta Plasma Consortium, RPC, were switched on during the event. Calibration and general testing were the main objectives, nevertheless valuable observations of the Earth's space environment have actually been made, in particular by the MIP. The principle of measurements of the MIP is as follows: an alternating current, I, with a frequency lying in the frequency range that contains the plasma frequency resonance, is driven through a transmitting electrode. The induced difference in voltage, V, measured on open circuit between two receiving electrodes is fed into a high input impedance amplifier. The mutual impedance, Z, which is computed onboard, is equal to the ratio of V to I. As Z depends essentially on the properties of the surrounding plasma, the frequency response of the mutual impedance probe may then be used for plasma diagnosis, in particular the electron plasma density and the magnetic field strength can be determined. The objective of the presentation is to show updated results and to compare them with simple models.

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