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Proton entry into the near-lunar plasma wake for magnetic field aligned flow
Space Physics Laboratory, Vikram Sarabhai Space Center, Trivandrum.
Space Physics Laboratory, Vikram Sarabhai Space Center, Trivandrum.
Swedish Institute of Space Physics / Institutet för rymdfysik.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
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2013 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 40, no 2, p. 2913-2917Article in journal (Refereed) Published
Abstract [en]

We report the first observation of protons in the near-lunar (100–200 km from the surface) and deeper (near anti-subsolar point) plasma wake when the interplanetary magnetic field (IMF) and solar wind velocity (vsw) are parallel (aligned flow; angle between IMF and vsw≤10°). More than 98% of the observations during aligned flow condition showed the presence of protons in the wake. These observations are obtained by the Solar Wind Monitor sensor of the Sub-keV Atom Reflecting Analyser experiment on Chandrayaan-1. The observation cannot be explained by the conventional fluid models for aligned flow. Back tracing of the observed protons suggests that their source is the solar wind. The larger gyroradii of the wake protons compared to that of solar wind suggest that they were part of the tail of the solar wind velocity distribution function. Such protons could enter the wake due to their large gyroradii even when the flow is aligned to IMF. However, the wake boundary electric field may also play a role in the entry of the protons into the wake.

Place, publisher, year, edition, pages
2013. Vol. 40, no 2, p. 2913-2917
National Category
Aerospace Engineering
Research subject
Space Technology
Identifiers
URN: urn:nbn:se:ltu:diva-12002DOI: 10.1002/grl.50617Local ID: b0f78c4c-2759-40ce-a049-728aabb97cb7OAI: oai:DiVA.org:ltu-12002DiVA, id: diva2:984952
Note
Validerad; 2013; 20130620 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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