Energetic charged particle measurements from Voyager 2 at the heliopause and beyond

被引：72

作者：

Krimigis, Stamatios M. ^{[1
,2
]}

Decker, Robert B. ^{[1
]}

Roelof, Edmond C. ^{[1
]}

Hill, Matthew E. ^{[1
]}

Bostrom, Carl O. ^{[1
]}

Dialynas, Konstantinos ^{[2
]}

Gloeckler, George ^{[3
]}

Hamilton, Douglas C. ^{[4
]}

Keath, Edward P. ^{[1
]}

Lanzerotti, Louis J. ^{[5
]}

机构：

[1] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[2] Acad Athens, Off Space Res & Technol, Athens, Greece

[3] Univ Michigan, Ann Arbor, MI 48109 USA

[4] Univ Maryland, College Pk, MD 20742 USA

[5] New Jersey Inst Technol, Newark, NJ 07102 USA

来源：

NATURE ASTRONOMY | 2019年 / 3卷 / 11期

关键词：

TERMINATION SHOCK; SOLAR-WIND; MAGNETIC-FIELD; HOT PLASMA; MAGNETOSPHERE; REGION; FLOW;

D O I：

10.1038/s41550-019-0927-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The long-anticipated encounter by Voyager 2 (V2) of the region between the heliosphere and the very local interstellar medium (VLISM) occurred toward the end of 2018. Here, we report measurements of energetic (>28 keV) charged particles on V2 from the interface region between the heliosheath, dominated by heated solar wind plasma, and the VLISM, expected to contain cold non-solar plasma and the Galactic magnetic field. The number of particles of solar origin began a gradual decrease on 7 August 2018 (118.2 au), while those of Galactic origin (Galactic cosmic rays) increased similar to 20% in number over a period of a few weeks. An abrupt change occurred on 5 November when V2 was located at 119 au, with a decrease in the number of particles at energies of >28 keV and a corresponding increase in the number of Galactic cosmic rays of energy E > 213 MeV. This signature of the transition to the VLISM resembles, but is very different from, that observed on Voyager 1 at similar to 121.6 au, associated with the putative crossing of the heliopause some six years earlier.

引用

页码：997 / 1006

页数：10

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