CORRELATIONS OF PLASMA DENSITY AND MAGNETIC FIELD STRENGTH IN THE HELIOSHEATH
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Gutynska-2010-CORRELATIONS OF PLAS.pdf
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Author(s)
Gutynska, O.
Šafránková, J.
Němeček, Z.
Richardson, John D.
Date Issued
October 2010
Journal
Astrophysical Journal. Letters
Publisher
IOP Publishing
Citation
Gutynska, O., J. Šafránková, Z. Němeček, and J. D. Richardson. “CORRELATIONS OF PLASMA DENSITY AND MAGNETIC FIELD STRENGTH IN THE HELIOSHEATH.” The Astrophysical Journal 722, no. 2 (October 5, 2010): L228–L232. © 2010 The American Astronomical Society
Version
Final published version
Abstract
The crossing of the termination shock (TS) by Voyager 2 in 2007 at 84 AU allows a comparison of fluctuations in different heliosheath regions. The Letter concentrates on MHD waves that exhibit a significant correlation between the magnetic field strength and plasma density. The correlations between both quantities were computed on 2?hr time intervals in the frequency range of 1 × 10[superscript -4] to 4 × 10[superscript -3] Hz. We separate the data into two regions with different magnetic field behavior; the post-TS region with many crossings of the current sheet and the unipolar region where the magnetic field direction remains nearly constant. We find that typical correlation coefficients in these regions are about 0.55-0.65, larger than in Earth's magnetosheath. The largest correlations occur when the spectrum of magnetic field fluctuations is dominated by low frequencies.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1088/2041-8205/722/2/l228
