Abstract
It is shown that the behavior of the cosmic ray density in a magnetic cloud near the Earth can for most events be described by a simple parabolic dependence on a distance to the cloud’s center, measured in gyro radii. Most magnetic clouds modulate cosmic rays, lowering their density. However, there are events (approximately 1/5) in which the cosmic ray density rises in a magnetic cloud. Events with the positive effect usually have a maximum in the leading part of the cloud. Several factors are considered that contribute to a model description, and these contributions are estimated.
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