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Proton kinetic effects and turbulent energy cascade rate in the solar wind
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Osman, K. T., Matthaeus, W. H., Kiyani, K., Hnat, B. and Chapman, Sandra C. (2013) Proton kinetic effects and turbulent energy cascade rate in the solar wind. Physical Review Letters, 111 (20). 201101 . doi:10.1103/PhysRevLett.111.201101 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.111.201101
Abstract
The first observed connection between kinetic instabilities driven by proton temperature anisotropy and estimated energy cascade rates in the turbulent solar wind is reported using measurements from the Wind spacecraft at 1 AU. We find enhanced cascade rates are concentrated along the boundaries of the (β∥, T⊥/T∥) plane, which includes regions theoretically unstable to the mirror and firehose instabilities. A strong correlation is observed between the estimated cascade rate and kinetic effects such as temperature anisotropy and plasma heating, resulting in protons 5–6 times hotter and 70%–90% more anisotropic than under typical isotropic plasma conditions. These results offer new insights into kinetic processes in a turbulent regime.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Solar wind, Plasma turbulence, Anisotropy, Cosmic magnetic fields | ||||||
Journal or Publication Title: | Physical Review Letters | ||||||
Publisher: | American Physical Society | ||||||
ISSN: | 0031-9007 | ||||||
Official Date: | 14 November 2013 | ||||||
Dates: |
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Volume: | 111 | ||||||
Number: | 20 | ||||||
Article Number: | 201101 | ||||||
DOI: | 10.1103/PhysRevLett.111.201101 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Seventh Framework Programme (European Commission) (FP7), United States. National Aeronautics and Space Administration (NASA), National Science Foundation (U.S.) (NSF) | ||||||
Grant number: | PIRSES-2010- 269297 (FP7); NNX08AT76G (NASA); AGS- 1156094, AGS-1063439 (NSF) |
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