IceCube Detects Extraterrestrial Neutrinos
The IceCube project at the South Pole makes the first detection of high-energy extraterrestrial neutrinos.
The IceCube project at the South Pole makes the first detection of high-energy extraterrestrial neutrinos.
The Fermi Large Area Telescope used a clever method of splitting electrons and positrons via the Earth’s magnetic field to show that there’s a significant excess of cosmic ray positrons at high energies – much more than can be explained using known cosmic ray processes.
Photons do not normally talk to each other – but put GeV gamma-rays into a high enough background radiation field, and eventually one will break the ice.
Ultra-high energy cosmic rays may be produced via shock acceleration. This paper presents theoretical upper limits on the energies of the cosmic rays that can be produced in this way, providing a means of testing this theory.