Low-energy (order 10 eV) ion flow in the magnetotail lobes inferred from spacecraft wake observations
2006 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 33, L06110-1-L06110-4 p.Article in journal (Refereed) Published
Cold ionospheric ions with eV energies are common inthe magnetosphere and can travel far out in the magnetotail.However, they are difficult to measure with conventional ionspectrometers mounted on spacecraft, since the potential of asunlit spacecraft often reaches several tens of volts. In thispaper we present two alternative methods of measuring thecold-ion flow with the Cluster spacecraft and apply them onone case in the magnetotail at 18 RE: 1. Ion spectrometer incombination with artificial spacecraft potential control;2. Deriving ion flow velocity (both perpendicular andparallel) from electric field instruments. The secondmethod takes advantage of the effect on the doubleprobeinstrument of the wake formed behind a spacecraftin a plasma flow. The results from the two methods showgood agreement and are also consistent with polar windmodels and previous measurements at lower altitudes,confirming the continuation of low-energy ion outflows.
Place, publisher, year, edition, pages
American Geophysical Union , 2006. Vol. 33, L06110-1-L06110-4 p.
low-energy ions, plasma flow, polar wind, spacecraft wake, Cluster satellites, measurement technique, ion outflow
Fusion, Plasma and Space Physics
Research subject Space and Plasma Physics
IdentifiersURN: urn:nbn:se:uu:diva-100646DOI: 10.1029/2005GL025179OAI: oai:DiVA.org:uu-100646DiVA: diva2:210734
Corrected in Geophysical Research Letters, 33, 14102 (2006).2009-04-042009-04-042009-10-08Bibliographically approved