TeV-PeV Cosmic-Ray Anisotropy as a Probe of the Local Interstellar Turbulence - INSPIRE

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TeV-PeV Cosmic-Ray Anisotropy as a Probe of the Local Interstellar Turbulence

Jun 26, 2017

7 pages

Published in:

PoS ICRC2017 (2018) 578

Contribution to:

- ICRC 2017
, 578

Published: Jun 26, 2017 by SISSA

DOI:

10.22323/1.301.0578

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Abstract: (SISSA)

We calculate the large-scale cosmic-ray (CR) anisotropies predicted for a range of Goldreich-Sridhar (GS) and isotropic models of interstellar turbulence, and compare them with IceTop data. In general, the predicted CR anisotropy is not a pure dipole; the cold spots reported at 400 TeV and 2 PeV are consistent with a GS model that contains a smooth deficit of parallel-propagating waves and a broad resonance function, though some other possibilities cannot, as yet, be ruled out. In particular, isotropic fast magnetosonic wave turbulence can match the observations at high energy, but cannot accommodate an energy dependence in the shape of the CR anisotropy. Our findings suggest that measurements of the large-scale CR anisotropy may be used as a local probe of the properties of the interstellar turbulence (notably its power-spectrum), and of CR transport, within a few tens of parsecs from Earth.

cosmic radiation: anisotropy
energy: high
IceCube: surface
turbulence
energy dependence
power spectrum
dipole

References(20)

Figures(0)

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