Voyager 1 and 2 Observations of a Change in the Nature of Magnetic Fluctuations in the VLISM with Increasing Distance from the Heliopause
| dc.contributor.author | Burlaga, L. F. | |
| dc.contributor.author | Ness, N. F. | |
| dc.contributor.author | Berdichevsky, D. B. | |
| dc.contributor.author | Jian, L. K. | |
| dc.contributor.author | Park, Jeewoo | |
| dc.contributor.author | Szabo, A. | |
| dc.date.accessioned | 2020-07-16T17:40:35Z | |
| dc.date.available | 2020-07-16T17:40:35Z | |
| dc.date.issued | 2020-06-25 | |
| dc.description.abstract | Voyager 2 (V2) crossed the heliopause at 119.0 au on 2018 day 309, after which it observed compressive (longitudinal) magnetic field fluctuations along the average magnetic field direction in the very local interstellar medium (VLISM) at distances from 119.00 to 121.48 au and latitudes 32.°2 to 32.°4 S in heliographic inertial coordinates from 2018 day 309 to 2019 day 230. This result confirms the observations of longitudinal magnetic field fluctuations by Voyager 1 (V1) between 124.14 and 128.71 au at 34.°6N (~2–7 au upwind of the heliopause) from 2013 day 133 to 2014 day 235. V1 crossed the heliopause at 121.58 au and 34.°5N on 2012 day 238. It came as a surprise to find it seemed that V1 observed transverse (Alfvénic) fluctuations of B between 131.40 and 135.98 au at latitude 34.°6–34.°7N (~10–14 au upwind of the heliopause) from 2015 day 145 to 2016 day 248. The most recent V1 observations show the possible presence of transverse fluctuations of B in the VLISM from 141.44 to 146.01 au at 34.°7–34.°8N (~20–24 au from the heliopause) between 2018 day 75 and 2019 day 178. Together, these observations show that longitudinal (compressive) magnetic field fluctuations are transmitted through the heliopause from the heliosheath into the VLISM, and are then converted into transverse (Alfvénic) fluctuations at ~130 au (~8 au from the heliopause) that are observed out at 146 au (~24 au from the heliopause). | en_US |
| dc.description.sponsorship | J.P. was supported by the NASA Voyager Project to the NASA/GSFC Magnetometer Team under internal NASA funding. N.F.N. was supported by the NASA Voyager Project under a cooperative agreement to the University of Maryland, Baltimore County. L.F.B. was supported by the NASA contract 80GSFC19C0012. D.B.B. was supported by the Voyager Project under a cooperative agreement with the TRIDENT-BERTICHEVSKY DANIEL B. partnership. J.K.L thanks the support from NASA’s Living with a Star and Heliophysics Supporting Research programs. We thank OMNIWeb of Space Physics Data Facility (https:// omniweb.gsfc.nasa.gov/coho/helios/heli.html) for providing the spacecraft orbit data to public. | en_US |
| dc.description.uri | https://iopscience.iop.org/article/10.3847/1538-3881/ab94a7 | en_US |
| dc.format.extent | 11 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2igrz-pozk | |
| dc.identifier.citation | L. F. Burlaga et al., Voyager 1 and 2 Observations of a Change in the Nature of Magnetic Fluctuations in the VLISM with Increasing Distance from the Heliopause,The Astronomical Journal, 160:40 (11pp) (2020), https://doi.org/10.3847/1538-3881/ab94a7 | en_US |
| dc.identifier.uri | https://doi.org/10.3847/1538-3881/ab94a7 | |
| dc.identifier.uri | http://hdl.handle.net/11603/19173 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | IOP | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Goddard Planetary Heliophysics Institute (GPHI) | |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights | This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.title | Voyager 1 and 2 Observations of a Change in the Nature of Magnetic Fluctuations in the VLISM with Increasing Distance from the Heliopause | en_US |
| dc.type | Text | en_US |