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The discovery of extraterrestrial neutrinos in the $\sim$ 30 TeV -- PeVenergy range by IceCube provides new constraints on high energy astrophysics.An important background to the signal are the prompt neutrinos which originatefrom the decay of charm hadrons produced by high energy cosmic-ray particlesinteracting in the Earth's atmosphere. It is conventional to use thecalculations of charm hadroproduction using gluon splitting $g \to c \bar c$alone. However, QCD predicts an additional "intrinsic" component of the heavyquark distribution which arises from diagrams where heavy quarks are multiplyconnected to the proton's valence quarks. We estimate the prompt neutrinospectrum due to intrinsic charm. We find that the atmospheric prompt neutrinoflux from intrinsic charm is comparable to those calculated using QCDcomputations not including intrinsic charm, once we normalize the intrinsiccharm differential cross sections to the ISR and the LEBC-MPS collaborationdata. In future, IceCube will constrain the intrinsic charm content of theproton and will contribute to one of the major questions in high energy physicsphenomenology.

IC at IC: IceCube can constrain the intrinsic charm of the proton