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Full-Sky Analysis of Cosmic-Ray Anisotropy with IceCube and HAWC · Around

2015

Full-Sky Analysis of Cosmic-Ray Anisotropy with IceCube and HAWC

The HAWC Collaboration, The IceCube Collaboration

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During the past two decades, experiments in both the Northern and Southern hemispheres have observed a small but measurable energy-dependent sidereal anisotropy in the arrival direction distribution of galactic cosmic rays.

The relative amplitude of the anisotropy is $10^{-4} - 10^{-3}$.
However, each of these individual measurements is restricted by limited sky coverage, and so the pseudo-power spectrum of the anisotropy obtained from any one measurement displays a systematic correlation between different multipole modes $C_\ell$.
To address this issue, we present the preliminary status of a joint analysis of the anisotropy on all angular scales using cosmic-ray data from the IceCube Neutrino Observatory located at the South Pole ($90^\circ$ S) and the High-Altitude Water Cherenkov (HAWC) Observatory located at Sierra Negra, Mexico ($19^\circ$ N).

Built on

F. J. M. Farley and J. R. Storey, The sidereal correlation of extensive air showers
1954
Earlier work this paper cites.
A. Lazarian and P. Desiati, Magnetic reconnection as the cause of cosmic ray excess from the heliospheric tail
Original
1981
Earlier work this paper cites.
M. Amenomori et al., Large-Scale Sidereal Anisotropy of Galactic Cosmic-Ray Intensity Observed by the Tibet Air Shower Array
2005
Earlier work this paper cites.
K. M. Górski et al., HEALPix: A Framework for High-Resolution Discretization and Fast Analysis of Data Distributed on the Sphere
2005
Earlier work this paper cites.
A. D. Erlykin and A. W. Wolfendale, The anisotropy of galactic cosmic rays as a product of stochastic supernova explosions
2006
Earlier work this paper cites.
G. Guillian et al., Observation of the anisotropy of 10TeV primary cosmic ray nuclei flux with the Super-Kamiokande-I detector
2007
Earlier work this paper cites.
A. A. Abdo et al., Discovery of Localized Regions of Excess 10-TeV Cosmic Rays
Original
2008
Earlier work this paper cites.
M. Aglietta et al., Evolution of the Cosmic-Ray Anisotropy Above 10 14
Original
2009
Earlier work this paper cites.
R. Abbasi et al., Measurement of the Anisotropy of Cosmic-ray Arrival Directions with IceCube
Original
2010
Earlier work this paper cites.

Similar

H. Ahn et al., Discrepant hardening observed in cosmic-ray elemental spectra
2010
Cited alongside, same era.
J. De Jong, Observations of Large Scale Sidereal Anisotropy in 1 and 11 TeV cosmic rays from the MINOS experiment
Original
2011
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R. Abbasi et al., Observation of Anisotropy in the Arrival Directions of Galactic Cosmic Rays at Multiple Angular Scales with IceCube
Original
2011
Cited alongside, same era.
Adriani et al., PAMELA Measurements of Cosmic-Ray Proton and Helium Spectra
2011
Cited alongside, same era.
R. Abbasi et al., Observation of Anisotropy in the Galactic Cosmic-Ray Arrival Directions at 400 TeV with IceCube
Original
2012
Cited alongside, same era.

Then

P. Desiati and A. Lazarian, Anisotropy of TeV Cosmic Rays and Outer Heliospheric Boundaries
2013
Later among the works it cites.
M. Pohl and D. Eichler, Understanding TeV-band Cosmic-Ray Anisotropy
Original
2013
Later among the works it cites.
A. U. Abeysekara et al., Observation of Small-scale Anisotropy in the Arrival Direction Distribution of TeV Cosmic Rays with HAWC
Original
2014
Later among the works it cites.
P. Desiati and A. Lazarian, Heliospheric Boundary and the TeV Cosmic Ray Anisotropy
2014
Later among the works it cites.
R. Kumar and D. Eichler, Large-scale Anisotropy of TeV-band Cosmic Rays
2014
Later among the works it cites.

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