Intermittency and q-Gaussian Distributions in the Magnetic Field of the Very Local Interstellar Medium (VLISM) Observed by Voyager 1 and Voyager 2

被引:11
作者
Burlaga, L. F. [1 ]
Ness, N. F. [2 ]
Berdichevsky, D. B. [3 ,4 ]
Jian, L. K. [5 ]
Park, J. [2 ,5 ]
Szabo, A. [5 ]
机构
[1] Leonard F Burlaga Inc, Davidsonville, MD 21035 USA
[2] Univ Maryland Baltimore Cty, Baltimore, MD 21250 USA
[3] Consejo Nacl Invest Cient & Tecn, UNR, IFIR, Esmeralda & 27 Febrero, Rosario, Santa Fe, Argentina
[4] NASA, TRIDENT, GSFC, Greenbelt, MD 20771 USA
[5] NASA, Heliophys Sci Div, GSFC, Greenbelt, MD 20771 USA
关键词
Interstellar medium; Interstellar magnetic fields; SOLAR-WIND; TURBULENCE;
D O I
10.3847/2041-8213/abb199
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Voyager 1 (V1) observed q-Gaussian distributions of 1 hr increments of the components the magnetic field B throughout the very local interstellar medium (VLISM) on scales on the order of 1 year, from 2013 through 2019, excluding the disturbed regions near two shocks. The intermittency of the components of B is described by q from the q-Gaussian distributions of 1 hr increments B as well as by the kurtosis K derived from the time series of the increments of B. Farther than similar to 5 au from the heliopause, Voyager 1 observed larger intermittency in the fluctuations of the predominantly transverse component B-N and in the nearly longitudinal component B-T of B. The average values of q for the B-N component and transverse B-T component for these data in the VLISM are q = 1.32 +/- 0.03 and q = 1.22 +/- 0.03, respectively. The corresponding average values of the kurtosis are K = 7.2 and K = 4.9. Voyager 2 (V2) crossed the heliopause on 2018 November 5. Near the heliopause, in 2019, V2 observed large intermittency in 1 hr increments of the compressive component B-T and smaller intermittency in B-N. The Voyager 2 observations give q.=.1.51.+/-.0.06 and q = 1.17 +/- 0.06 for the B-N and B-T components of B, respectively, as well as K = 7.2 and K = 12.3, respectively. The intermittency in B-T and B-N, observed by V2 near the heliopause was significantly larger than that observed by V1 when it was near the heliopause.
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页数:6
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