Computer Science – Sound
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm51b0524m&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM51B-0524
Computer Science
Sound
2730 Magnetosphere: Inner, 2768 Plasmasphere, 2794 Instruments And Techniques
Scientific paper
The perigee passes of CLUSTER allow us to perform valuable multipoint observations of the plasmasphere.In many studies related to these observations, one needs high resolution measurements of the electron density. The problem is that above 80 e-/cc, which is usually the case near perigee, only the spacecraft potential is available. Therefore, we have put a particular attention to better understanding the relationship between the spacecraft potential (ScP), measured by the EFW experiment, and the electron density (Ne). Below L=6, the CLUSTER electron particle instrument (PEACE) is turned off to avoid any possible damage while crossing the radiation belts. Therefore, near perigee (L ~ 4), the only instrument available to estimate the total plasma density, within the range 0.2-80 cm-3, is the WHISPER relaxation sounder. In its sounding mode, the density is often measured every 28 s and in the passive mode every 2.2 s. For comparison, ScP is continuously recorded every 0.2 s. By combining the measurements of EFW and WHISPER, we modelise the local behavior of Ne vs ScP. When the density reaches values above 80 cm-3, our model is used to estimate the electron density from the ScP measurements only. A detailed explanation of this new method and its application to a single CLUSTER dataset near perigee, is given in Moullard et al. (GRL, in press, 2002). We present here the results of a statistical study of the application of this new method based on 2 years of CLUSTER perigee passes. Different modelisations are tested and the range of their related parameters based on these two years of data will be presented. Comparisons between the 4 CLUSTER satellites as well as the POLAR mission will be addressed.
André Martial
Décréau Pierrette
Laakso Harri
Masson Andre
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