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Four-point high time resolution information on electron densities by the electric field experiments (EFW) on cluster
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2001 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 19, no 12-okt, 1483-1489 p.Article in journal (Refereed) Published
Abstract [en]

For accurate measurements of electric fields, spherical double probes are electronically controlled to be at a positive potential of approximately 1 V relative to the ambient magnetospheric plasma. The spacecraft will acquire a potential which balances the photoelectrons escaping to the plasma and the electron flux collected from the plasma. The probe-to-plasma potential difference can be measured with a time resolution of a fraction of a second, and provides information on the electron density over a wide range of electron densities from the lobes (similar to0.01 cm(-3)) to the magnetosheath (> 10 cm(-3)) and the plasmasphere (> 100 cm(-3)). This technique has been perfected and calibrated against other density measurements on GEOS, ISEE-1, CRRES, GEOTAIL and POLAR. The Cluster spacecraft potential measurements opens the way for new approaches, particularly near boundaries and gradients where four-point measurements will provide information never obtained before. Another interesting point is that onboard data storage of this simple parameter can be done for complete orbits and thereby will provide background information for the shorter full data collection periods on Cluster. Preliminary calibrations against other density measurements on Cluster will be reported.

Place, publisher, year, edition, pages
2001. Vol. 19, no 12-okt, 1483-1489 p.
Keyword [en]
magnetospheric physics, magnetopause cusp, and boundary layers, space plasma physics, spacecraft, sheaths, wakes, charging, instruments and techniques, potential measurements, spacecraft, plasma, magnetosphere, mission
National Category
Astronomy, Astrophysics and Cosmology Meteorology and Atmospheric Sciences
URN: urn:nbn:se:kth:diva-21813ISI: 000177381900003ScopusID: 2-s2.0-6444245813OAI: diva2:340511

QC 20100525

Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2016-04-18Bibliographically approved

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Lindqvist, Per-Arne
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Alfvén Laboratory
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