Recent Particle Measurements from Voyagers 1 and 2

13th Annual International Astrophysics Conference: Voyager, IBEX, and the Interstellar Medium

物理学;天文学

Decker, R.B.^1 ; Krimigis, S.M.^1,2 ; Roelof, E.C.^1 ; Hill, M.E.^1

Johns Hopkins University, Applied Physics Laboratory, Laurel

MD

20723, United States^1

Office of Space Research and Technology, Academy of Athens, Athens, Greece^2

关键词: Energy dependence;    Interstellar mediums;    Ion energies;    Ion intensities;    Particle measurement;    Pitch angle distribution;    Quantitative measures;    Thermal plasma;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/577/1/012006/pdf
DOI  :  10.1088/1742-6596/577/1/012006

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We summarize recent measurements made by the LECP instrument on Voyager 1 near its crossing of the heliopause and entry into the interstellar medium on or about day 238 of 2012 at 121.6 AU, and on Voyager 2 mainly during the period 2012-2014.4 characterized by large variations in the intensities and angular distributions of low-energy heliosheath ions and the reappearance of low-energy heliosheath electrons. Results from Voyager 1 not previously published include the energy dependence of ion intensity decreases prior to the heliopause crossing and a quantitative measure of the evolution of low-energy heliosheath proton pitch angle distributions that extend across the heliopause. For Voyager 2 we describe the evolution in time and with ion energy of the tangential streaming of ions directed from the nose toward the tail of the heliosheath, summarize the recovery of low-energy heliosheath ion intensities since their decline to minimum levels during 2013.0-3013.3, and discuss the effects of this intensity minimum and subsequent recovery on the ion partial pressure in the heliosheath and on its magnitude relative to that of the thermal plasma and the magnetic field.