High time resolution density measurements by Cluster at the Earth's bow shock

Details High time resolution density measurements by Cluster at the Earth's bow shock High time resolution density measurements by Cluster at the Earth's bow shock

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm43c1233m&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM43C-1233

Computer Science

Sound

7894 Instruments And Techniques

Scientific paper

In most of the regions crossed by the Cluster mission, the active sounding of the WHISPER experiment provides accurate electron density data on all four spacecraft. These measurements are performed every 28 s in normal mode. In some plasma conditions, the WHISPER passive VLF spectra can also be used to extract the electron density, but only when a clear plasma frequency cut-off is observed. The time resolution of these measurements is 2.2s in normal mode. The potential difference between one EFW probe and the spacecraft, usually called spacecraft potential, is measured every 0.2 s. Its variation is strongly dependent on the electron density but also on the photoelectron temperature, the plasma composition, the bias current and the radius of the sphere for a double probe experiment. Properly calibrating the s/c potential on Cluster is necessary to provide reliable electron density data with a time resolution up to 140 times better than the WHISPER active sounding data in normal mode. Results related to the calibration of the s/c potential at the Earth's bow shock will be presented. S/c potential versus density relationship with error bar is proposed, for each bias current applied to the probes. This analysis is based on tens of bow shock crossings by Cluster. Comparison with recent numerical simulations dedicated to the behaviour of the spacecraft potential measurements on Cluster will also be presented.

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