Vertical sea-level muon spectrum at solar minimum near geomagnetic equator in the momentum range 0.5-3 GeV/c

The absolute sea-level vertical differential muon spectrum in the momentum range 0.5-3 GeV/c has been measured at solar minimum near the geomagnetic equator and compared with other recent measurements at high latitudes. The spectral shape derived from the theory of Olbert is in accord with the experimental results. The observed difference from the high-latitude muon spectrum can be explained in terms of the geomagnetic-latitude effects.