2010

Atmospheric Variations as observed by IceCube

Tilav, Serap, Desiati, Paolo, Kuwabara, Takao et al.

Understand

We have measured the correlation of rates in IceCube with long and short term variations in the South Pole atmosphere.

The yearly temperature variation in the middle stratosphere (30-60 hPa) is highly correlated with the high energy muon rate observed deep in the ice, and causes a +/-10% seasonal modulation in the event rate.
The counting rates of the surface detectors, which are due to secondary particles of relatively low energy (muons, electrons and photons), have a negative correlation with temperatures in the lower layers of the stratosphere (40-80 hPa), and are modulated at a level of +/-5%.
The region of the atmosphere between pressure levels 20-120 hPa, where the first cosmic ray interactions occur and the produced pions/kaons interact or decay to muons, is the Antarctic ozone layer.

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