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Temperature anisotropy in the presence of ultra low frequency waves in the terrestrial foreshock
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Selzer, Luke A., Hnat, B., Osman, K. T., Nakariakov, V. M. (Valery M.), Eastwood, Jonathan P. and Burgess, D. (2014) Temperature anisotropy in the presence of ultra low frequency waves in the terrestrial foreshock. The Astrophysical Journal Letters, Volume 788 (Number 1). Article number L5. doi:10.1088/2041-8205/788/1/L5 ISSN 2041-8205.
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Official URL: http://dx.doi.org/10.1088/2041-8205/788/1/L5
Abstract
We report the first study of the correlation between elevated solar wind core plasma temperatures and temperature anisotropy in the terrestrial foreshock. Plasma temperature is enhanced near the fire hose marginal stability threshold in the presence of ultra low frequency (ULF) large amplitude magnetic perturbations, which are intrinsically right-hand circularly polarized. Direct comparison of contemporaneous anisotropic temperatures in the upstream solar wind and the foreshock suggest that the net heating of plasma is mediated via increase of the parallel temperature in the foreshock region where the ULF waves are present. We consider the possibility that a mechanism based on Landau damping, where solar wind plasma temperature parallel to the background magnetic field is increased by interaction with oblique compressible fast magneto-acoustic ULF waves, influences temperature anisotropy.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Solar-terrestrial physics, Solar wind | ||||||||
Journal or Publication Title: | The Astrophysical Journal Letters | ||||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||||
ISSN: | 2041-8205 | ||||||||
Official Date: | 21 May 2014 | ||||||||
Dates: |
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Volume: | Volume 788 | ||||||||
Number: | Number 1 | ||||||||
Number of Pages: | 5 | ||||||||
Article Number: | Article number L5 | ||||||||
DOI: | 10.1088/2041-8205/788/1/L5 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Date of first compliant deposit: | 27 December 2015 | ||||||||
Date of first compliant Open Access: | 27 December 2015 | ||||||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), European Union (EU) | ||||||||
Grant number: | ST/J001546/1 (STFC), ST/G00725X/1 (STFC) |
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