Fig. 4From: Phase space representation of neutron monitor count rate and atmospheric electric field in relation to solar activity in cycles 21 and 22Phase space representation of the neutron monitor count rate in the form of X NC versus V NC (central panel). The solid green line represents the short-term case, while the dashed black line stands for the long-term case. Left panel histogram representation of the V NC. Bottom panel histogram representation of the X NC Back to article page