Intermittency and q-Gaussian Distributions in the Magnetic Field of the Very Local Interstellar Medium (VLISM) Observed by Voyager 1 and Voyager 2
Voyager 1 (V1) observed q -Gaussian distributions of 1 hr increments of the components the magnetic field 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 componen...
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Veröffentlicht in: | Astrophysical journal. Letters 2020-09, Vol.901 (1), p.L2 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Voyager 1 (V1) observed
q
-Gaussian distributions of 1 hr increments of the components the magnetic field
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
. Farther than ∼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
. 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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ISSN: | 2041-8205 2041-8213 |
DOI: | 10.3847/2041-8213/abb199 |