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Intermittency and local heating in the solar wind
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Osman, K. T., Matthaeus, W. H., Wan, M. and Rappazzo, A. F. (2012) Intermittency and local heating in the solar wind. Physical Review Letters, Volume 108 (Number 26). Article number 261102. doi:10.1103/PhysRevLett.108.261102 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.108.261102
Abstract
Evidence for nonuniform heating in the solar wind plasma near current sheets dynamically generated by magnetohydrodynamic (MHD) turbulence is obtained using measurements from the ACE spacecraft. These coherent structures only constitute 19% of the data, but contribute 50% of the total plasma internal energy. Intermittent heating manifests as elevations in proton temperature near current sheets, resulting in regional heating and temperature enhancements extending over several hours. The number density of non-Gaussian structures is found to be proportional to the mean proton temperature and solar wind speed. These results suggest magnetofluid turbulence drives intermittent dissipation through a hierarchy of coherent structures, which collectively could be a significant source of coronal and solar wind heating. © 2012 American Physical Society.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review Letters | ||||
Publisher: | American Physical Society | ||||
ISSN: | 0031-9007 | ||||
Official Date: | June 2012 | ||||
Dates: |
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Volume: | Volume 108 | ||||
Number: | Number 26 | ||||
Page Range: | Article number 261102 | ||||
DOI: | 10.1103/PhysRevLett.108.261102 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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