Is the galactic cosmic-ray spectrum constant in time?

David Eichler, Rahul Kumar, Martin Pohl

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The hypothesis is considered that the present, local Galactic cosmic-ray spectrum is, due to source intermittency, softer than average over time and over the Galaxy. Measurements of muogenic nuclides underground could provide an independent measurement of the time-averaged spectrum. Source intermittency could also account for the surprising low anisotropy reported by the IceCube Collaboration. Predictions for Galactic emission of ultrahigh-energy (UHE) quanta, such as UHE gamma rays and neutrinos, might be higher or lower than previously estimated.

Original languageEnglish
Article number138
JournalAstrophysical Journal
Issue number2
StatePublished - 1 Jun 2013


  • cosmic rays


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