July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Anisotropy in Cosmic Ray Arrival Directions Using IceCube and IceTop

Jul 30, 2015, 11:00 AM
World Forum Theater (World Forum)

World Forum Theater

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution CR-EX Parallel CR01 Aniso


Stefan Westerhoff (University of Wisconsin-Madison)


We provide an update on the continued observation of anisotropy in the arrival direction distribution of cosmic rays in the southern hemisphere. The IceCube neutrino observatory recorded more than 250 billion events between May 2009 and May 2014. Subtracting dipole and quadrupole fit maps, we can use these increased statistics to see significant small-scale structure that approaches our median angular resolution of 3 degrees. The expanded dataset also allows for a more detailed study of the anisotropy for various cosmic-ray median energies. The large-scale structure observed at median eneries near 20 TeV appears to shift around 150 TeV, with the high-energy skymap showing a strong deficit also present in IceTop maps of similar energies.
Registration number following "ICRC2015-I/" 163
Collaboration IceCube

Primary author

Stefan Westerhoff (University of Wisconsin-Madison)


Frank McNally (University of Wisconsin - Madison) Paolo Desiati (University of Wisconsin - Madison)

Presentation materials