Anisotropies in TeV Cosmic Rays Related to the Local Interstellar Magnetic Field from the IBEX Ribbon

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

物理学;天文学

Schwadron, N.A.^1,2 ; Adams, F.C.^3 ; Christian, E.^4 ; Desiati, P.^5 ; Frisch, P.^6 ; Funsten, H.O.^7 ; Jokipii, J.R.^8 ; McComas, D.J.^2,9 ; Moebius, E.^1 ; Zank, G.P.^10

University of New Hampshire, Durham

AH

03824, United States^1

Southwest Research Institute, San Antonio

TX

78228, United States^2

University of Michigan, Ann Arbor

MI

48109, United States^3

Goddard Space Flight Center, Greenbelt

MD

20771, United States^4

IceCube Research Center, Astronomy Department, University of Wisconsin, Madison

WI

53706, United States^5

University of Chicago, Department of Astronomy and Astrophysics, Chicago

IL

60637, United States^6

Los Alamos National Laboratory, Los Alamos

NM

87545, United States^7

University of Arizona, Department of Planetary Sciences, Tucson

AZ

85721, United States^8

University of Texas, San Antonio

TX

78228, United States

(10) University of Alabama, Huntsville

AL

35805, United States^9

关键词: Anisotropic structure;    Consistent orientations;    Cosmic ray anisotropy;    Energetic neutral atoms;    Interstellar magnetic fields;    Local interstellar medium;    Small-scale structures;    Velocity directions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/577/1/012023/pdf
DOI  :  10.1088/1742-6596/577/1/012023

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

The Interstellar Boundary Explorer (IBEX) observes enhanced Energetic Neutral Atoms (ENAs) emission in the keV energy range from a narrow (∼20° wide) "ribbon" in the sky that appears to be centered on the direction of the local interstellar (LIS) magnetic field. The Milagro collaboration, the Asγ collaboration and the IceCube observatory have recently made global maps of cosmic ray fluxes in the TeV energy range, revealing anisotropic structures ordered in part by the local interstellar magnetic field and the interstellar flow. This paper following from a recent publication in Science makes the link between these disparate observations by developing a simple model of the magnetic structure surrounding the heliosphere in the Local Interstellar Medium (LISM) that is consistent with both IBEX ENA fluxes and TeV cosmic ray anisotropies. The model also employs the revised velocity direction of the LIC derived from neutral He observations by IBEX. By modeling the propagation of cosmic rays through this magnetic field structure, we specifically show that (1) the large-scale TeV anisotropy provides a roughly consistent orientation for the local interstellar magnetic field at the center of the IBEX Ribbon and corroborates the ∼ 3 μG magnitude of the local interstellar magnetic field derived from IBEX observations of the global heliosphere; (2) and small-scale structures in cosmic rays (over