Some examples (particularly the one of March ― April, 2001), relevant for cosmic ray (CR) studies related to Space Weather, are discussed: (ⅰ) possible precursors in the CR flux recorded by neutron monitor (NM) and muon telescope (MT) networks before geomagnetic disturbances; (ⅱ) NM data for correlative radiation measurements on airplanes; (ⅲ) different CR intensity variability at different cutoff rigidity sites during the March 31, 2001 geomagnetic disturbance; the inclusion of Dst values in the CR trajectory computations improves the estimates of the NM counting-rate increase due to cutoff depressions during high levels of geomagnetic activity. In this context, coordinated NM and low-altitude polar-orbiting satellite measurements are important.
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