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Statistically determined dispersion relations of magnetic field fluctuations in the terrestrial foreshock
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Hnat, Bogdan, O’Connell, D, Nakariakov, V. M. (Valery M.) and Sundberg, T. (2016) Statistically determined dispersion relations of magnetic field fluctuations in the terrestrial foreshock. The Astrophysical Journal, 827 (2). 91. doi:10.3847/0004-637X/827/2/91 ISSN 0004-637X.
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Official URL: http://dx.doi.org/10.3847/0004-637X/827/2/91
Abstract
We obtain dispersion relations of magnetic field fluctuations for two crossings of the terrestrial foreshock by Cluster spacecraft. These crossings cover plasma conditions that differ significantly in their plasma β and in the density of the reflected ion beam, but not in the properties of the encountered ion population, both showing shell-like distribution function. Dispersion relations are reconstructed using two-point instantaneous wave number estimations from pairs of Cluster spacecraft. The accessible range of wave vectors, limited by the available spacecraft separations, extends to ≈2 × 104 km. Results show multiple branches of dispersion relations, associated with different powers of magnetic field fluctuations. We find that sunward propagating fast magnetosonic waves and beam resonant modes are dominant for the high plasma β interval with a dense beam, while the dispersions of the interval with low beam density include Alfvén and fast magnetosonic modes propagating sunward and anti-sunward.
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): | Cluster Mission (Spacecraft) , Shock waves | ||||||
Journal or Publication Title: | The Astrophysical Journal | ||||||
Publisher: | Institute of Physics Publishing, Inc. | ||||||
ISSN: | 0004-637X | ||||||
Official Date: | 20 August 2016 | ||||||
Dates: |
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Volume: | 827 | ||||||
Number: | 2 | ||||||
Article Number: | 91 | ||||||
DOI: | 10.3847/0004-637X/827/2/91 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 18 November 2016 | ||||||
Date of first compliant Open Access: | 18 November 2016 | ||||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC), Seventh Framework Programme (European Commission) (FP7) | ||||||
Grant number: | ST/I000720/1 (STFC), Turboplasmas funding (FP7) |
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