Abstract
Abstract. Moon shadow analyses are standard methods to calibrate cosmic-ray detectors. We report on a three-year observation of cosmic-ray Moon and Sun shadows in different detector configurations. The cosmic-ray Moon shadow was observed with high statistical significance (> 6σ) in previous analyses when the IceCube detector operated in a smaller configuration before it was completed in December 2010. This work shows first analyses of the cosmic-ray Sun shadow in IceCube. A binned analysis in one-dimension is used to measure the Moon and Sun shadow with high statistical significance greater than 12σ.
Highlights
IceCube is a Cherenkov light detector with an instrumented volume of 1 km3 at the geographic South Pole
The IceCube detector is located at the geographic South Pole, containing 86 strings deployed in glacial ice
The statistical significance S is computed by the difference between the χL2ine of a line and the χg2aussian of a Gaussian that are fitted to data: χ 2 = χg2aussian − χL2ine
Summary
IceCube is a Cherenkov light detector with an instrumented volume of 1 km at the geographic South Pole. Its shadow is expected to be influenced by the solar magnetic field. An anticorrelation between the number of Sun spots and the depth of the Sun shadow was seen in the Tibet AS-Gamma experiment (Amenomori et al, 2013). The effect for the Sun is expected to be caused by the deflection of charged cosmic-rays in the magnetic field close to the solar surface. Simulations near the source surface for different models (CSSS and PFSS) are compared with measured data from the Tibet AS-Gamma experiment in Amenomori et al (2013). The IceCube Moon and Sun shadow analysis is based on a binned analysis which compares on- and off-source regions to compute relative deficit of events at the expected position of the celestial body
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