CORRELATIONS OF PLASMA DENSITY AND MAGNETIC FIELD STRENGTH IN THE HELIOSHEATH
- Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, 180 00 Prague 8 (Czech Republic)
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 x 10{sup -4} to 4 x 10{sup -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.
- OSTI ID:
- 21457031
- Journal Information:
- Astrophysical Journal Letters, Vol. 722, Issue 2; Other Information: DOI: 10.1088/2041-8205/722/2/L228; ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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