EFFECTS OF FAST AND SLOW SOLAR WIND ON THE ENERGETIC NEUTRAL ATOM (ENA) SPECTRA MEASURED BY THE INTERSTELLAR BOUNDARY EXPLORER (IBEX) AT THE HELIOSPHERIC POLES

被引：38

作者：

Dayeh, M. A. ^{[1
]}

McComas, D. J. ^{[1
,2
]}

Allegrini, F. ^{[1
,2
]}

De Majistre, B. ^{[3
]}

Desai, M. I. ^{[1
,2
]}

Funsten, H. O. ^{[4
]}

Janzen, P. ^{[5
]}

Livadiotis, G. ^{[1
]}

Randol, B. M. ^{[1
,2
]}

Reisenfeld, D. B. ^{[5
]}

Schwadron, N. A. ^{[1
,6
]}

Vanderspek, R. ^{[7
]}

机构：

[1] SW Res Inst, San Antonio, TX 78228 USA

[2] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA

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

[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[5] Univ Montana, Missoula, MT 59812 USA

[6] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA

[7] MIT, Ctr Space Res, Cambridge, MA 02139 USA

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 749卷 / 01期

关键词：

plasmas; ISM: kinematics and dynamics; solar wind; Sun: heliosphere; TERMINATION SHOCK; PLASMA; HELIOSHEATH; ORBIT; MODEL; FLUX;

D O I：

10.1088/0004-637X/749/1/50

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the energy dependence of similar to 0.5-6 keV energetic neutral atom (ENA) spectra in the southern heliospheric polar region obtained during five six-month sky maps measured by IBEX-Hi. We calculate the spectral slopes in the south pole in four different energy bands, namely, similar to 0.7-1.1 keV, similar to 1.1-1.7 keV, similar to 1.7-2.7 keV, and similar to 2.7-4.3 keV. We show (1) a persistent flattening of the ENA spectrum between similar to 1 and 2 keV, (2) significantly different modes (2.31, 1.58, 0.97, and 1.44) for the distributions of the slopes in the four different energy bands, and (3) a general decrease with increasing energy in the widths (FWHM) and mode fluctuations (their spread) of the slope distributions. We also compare the averaged ENA spectra measured at the south pole and at mid-latitudes. We conclude that the flattening between similar to 1 and 2 keV in the polar spectrum (spectral break) is produced by an enhancement of ENAs created by charge exchange between interstellar neutrals and pick-up ions in the fast solar wind.

引用

页数：6

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