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I am reading about neutrino detectors, especially about IceCube Neutrino detector and while going through some papers I found the statement "IceCube is more sensitive to point sources in the northern hemisphere than in the southern hemisphere." from Wikipedia and this site which I am not able to understand.

What might be the reason?

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    $\begingroup$ More noise coming from the southern sky :) $\endgroup$
    – Qmechanic
    Aug 29 '18 at 12:48
  • $\begingroup$ Sorry I didn't understand it. Could you explain a bit more or direct me towards some article? $\endgroup$
    – AngryBach
    Aug 29 '18 at 13:26
  • $\begingroup$ Yes, the noise is due to atmospheric muons from the southern sky. $\endgroup$
    – user137289
    Aug 29 '18 at 13:51
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Because there is a lot more mass/material between the South pole and the northern hemisphere (namely the earth) than between the South pole and the southern hemisphere, noise-inducing particles such as muons (as mentioned in the comments) are absorbed/scattered before they reach your detector.

This follows from the fact that the Earth has a much higher density than the atmosphere.

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