Anisotropies in TeV Cosmic Rays Related to the IBEX Ribbon

Cosmic Ray Anisotropy Workshop 2013

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.^10

University of New Hampshire, Durham, NH 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 Spaceflight Institute, United States^4

IceCube Research Center and 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, United States^8

University of Texas, San Antonio, TX 78228, United States

(10) University of Alabama, Huntsville, AL, United States^9

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

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/531/1/012010/pdf
DOI  :  10.1088/1742-6596/531/1/012010

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