Studies of the sidereal daily variation of cosmic ray intensity with particular reference to observations underground

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1.1 Introductory Remarks There is now considerable evidence that the charged primary cosmic radiation to which detectors at the earth respond is essentially isotropic in free space, at least in the seven decades of rigidity from 10\\(^{10}\\) v to 10\\(^{17}\\) v. In fact, many careful investigations over some thirty years have failed to produce convincing evidence for even a small excess of charged particle flux from any fixed galactic direction. More particularly, if the amplitude of the observed anisotropy is specified as A = I\\(_{max}\\) - I\\(_{min}\\) / I\\(_{max}\\) + I\\(_{min}\\) , there would appear to be zero anisotropy, with a margin of uncertainty of amplitude varying from less than 0.2% at the lowest primary rigidities to about 3% at the highest rigidities. Nevertheless, small anisotropies have been predicted, of special interest being those that should be associated with the propagation of cosmic rays through the galaxy in the presence of large-scale magnetic fields. In

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