Journal article
Magnetic Field and Plasma Density Observations of a Pressure Front by Voyager 1 during 2020 in the Very Local Interstellar Medium
The Astrophysical journal, Vol.911(1), p.61
04/01/2021
DOI: 10.3847/1538-4357/abeb6a
Abstract
Voyager 1 has been moving through the very local interstellar medium (VLISM) from the time that it crossed the heliopause on 2012/DOY 238 to 2020/DOY 292. Three notable objects in the magnetic field of the VLISM have been observed: two shocks and one pressure front. This paper reports the observation of a fourth object observed near 2020/DOY 147. There were no upstream electron plasma oscillations of the type often observed ahead of shocks, abrupt increases in energetic particles, or fluctuations in the 48 s increments of the magnetic field associated with this feature, suggesting that it was probably not a shock. This feature was associated with a relatively large increase in the magnetic field strength (B2/B1 = 1.35) and in the electron density determined by the Plasma Wave Science experiment (N2/N1 = 1.36) using a new method described in this paper. This feature appears to be a pressure front associated with a compressive wave in the VLISM. The two shocks and the two pressure fronts were associated with the four largest maxima observed in B(t) between 2012/DOY 238 and 2020/DOY 292. Each feature was associated with a jump-ramp structure. The jump-ramp structures were separated by long relatively undisturbed quiet intervals.
Details
- Title: Subtitle
- Magnetic Field and Plasma Density Observations of a Pressure Front by Voyager 1 during 2020 in the Very Local Interstellar Medium
- Creators
- L. F. BurlagaW. S. Kurth - University of IowaD. A. Gurnett - University of IowaD. B. Berdichevsky - Institute of Physics RosarioL. K. Jian - HeliophysicsN. F. NessJ. Park - HeliophysicsA. Szabo - Heliophysics
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.911(1), p.61
- DOI
- 10.3847/1538-4357/abeb6a
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- Iop Publishing Ltd
- Number of pages
- 9
- Grant note
- DOI: 10.13039/100006198, name: NASA ∣ Goddard Space Flight Center, award: 80GSFC19C0012
- Language
- English
- Date published
- 04/01/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455548102771
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