High time resolution electron density estimation in the vicinity of the Earth's magnetotail using PEACE, WHISPER and EFW experiments on Cluster

Details High time resolution electron density estimation in the vicinity of the Earth's magnetotail using PEACE, WHISPER and EFW experiments on Cluster High time resolution electron density estimation in the vicinity of the Earth's magnetotail using PEACE, WHISPER and EFW experiments on Cluster

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm12a..08m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM12A-08

Computer Science

Sound

2794 Instruments And Techniques

Scientific paper

The four spacecraft of the ESA/NASA Cluster mission were launched in summer 2000 and put into a polar orbit with a perigee at 4 Earth radii (Re) and a line of apsides around the ecliptic plane. To date there have been 6 magnetotail seasons of around 4 months duration in which the spacecraft apogee has precessed across the magnetotail at a geocentric distance of about 20 Re. The plasma density in the vicinity of the tail is a difficult parameter to derive as plasma are tenuous. The Cluster satellites carry five instruments (CIS, EFW, PEACE, WBD, WHISPER) that provide information about the local electron and ion density. This study focuses on the derivation of high time resolution (0.2s) electron density timeseries using active soundings of the WHISPER relaxation sounder, the spacecraft potential measured by the EFW electric field instrument and the electron density estimation derived from the PEACE electron experiment. Analysis of a few tens of cases collected during the 2002 and 2003 tail seasons, of a few hours duration each, will be presented. A new procedure to calibrate the spacecraft potential based on active soundings and numerical simulations will be detailed. Benefits of this study to the calibration of the electron density estimation by PEACE will also be exposed.

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