Suprathermal Ions in the Outer Heliosphere

被引：21

作者：

Kollmann, Peter ^{[1
]}

Hill, M. E. ^{[1
]}

McNutt, R. L., Jr. ^{[1
]}

Brown, L. E. ^{[1
]}

Allen, R. C. ^{[1
]}

Clark, G. ^{[1
]}

Andrews, B. ^{[1
]}

Salazar, N. ^{[1
]}

Westlake, J. ^{[1
]}

Romeo, G. ^{[1
]}

Vandegriff, J. ^{[1
]}

Kusterer, M. ^{[1
]}

Smith, D. ^{[1
]}

Jaskulek, S. ^{[1
]}

Decker, R. ^{[1
]}

Cheng, A. F. ^{[1
]}

Krimigis, S. M. ^{[1
]}

Lisse, C. M. ^{[1
]}

Mitchell, D. G. ^{[1
]}

Weaver, H. A. ^{[1
]}

Delamere, P. ^{[2
]}

Elliott, H. A. ^{[3
]}

Fattig, E. ^{[3
]}

Gladstone, G. R. ^{[3
]}

Valek, P. W. ^{[3
]}

Weidner, S. ^{[3
]}

Bagenal, F. ^{[4
]}

Horanyi, M. ^{[4
]}

Kammer, J. A. ^{[4
]}

Kaufmann, D. ^{[4
]}

Olkin, C. B. ^{[4
]}

Piquette, M. R. ^{[4
]}

Spencer, J. R. ^{[4
]}

Steffl, A. J. ^{[4
]}

Stern, S. A. ^{[4
]}

Young, L. A. ^{[4
]}

Ennico, K. ^{[5
]}

Linscott, I. R. ^{[6
]}

Strobel, D. F. ^{[7
]}

Summers, M. E. ^{[8
]}

Szalay, J. R. ^{[9
]}

机构：

[1] Johns Hopkins Univ, Appl Phys Lab, 11101 Johns Hopkins Rd, Laurel, MD 20723 USA

[2] Univ Alaska, Fairbanks, AK 99701 USA

[3] Southwest Res Inst, San Antonio, TX USA

[4] Southwest Res Inst, Boulder, CO USA

[5] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[6] Stanford Univ, Stanford, CA 94305 USA

[7] Johns Hopkins Univ, Baltimore, MD USA

[8] George Mason Univ, Fairfax, VA 22030 USA

[9] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

来源：

ASTROPHYSICAL JOURNAL | 2019年 / 876卷 / 01期

关键词：

acceleration of particles; interplanetary medium; plasmas; shock waves; COROTATING INTERACTION REGIONS; INTERSTELLAR PICKUP IONS; SOLAR-WIND; ENERGETIC PARTICLES; SHOCK ACCELERATION; TERMINATION SHOCK; FLUX; VOYAGER-1; SPECTRUM; ENTROPY;

D O I：

10.3847/1538-4357/ab125f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Suprathermal ions form from interstellar gas that is first ionized into pickup ions and then accelerated to tens and hundreds of keV in energy. The resulting suprathermal ion spectra with hundreds of keV have been previously observed throughout the heliosphere; however, measurements at lower energies, around the pickup ion cutoff energy where they are accelerated from, were limited to <10 au. Here we present a statistical study of suprathermal ions in the keV to hundred keV energy range. We use the Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) instrument on the New Horizons spacecraft, which recorded observations at a wide range of heliocentric distances, and compare these measurements to charge energy mass spectrometer (CHEMS) observations on Cassini, which cruised to and remained at Saturn. We find that the power-law exponents of suprathermal ion intensity over energy are between -1 and -2, change abruptly close to discontinuities that are likely corotating merged interaction regions, correlate with the solar wind bulk speed, and show a long-term evolution on the timescale of the solar cycle. The independent measurements from New Horizons and Cassini are consistent, confirming the first fully calibrated measurements from the New Horizons/PEPSSI instrument.

引用

页数：10

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