Responses to solar cosmic rays of neutron monitors of a various designстатья
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Аннотация:The modeled and observed responses of neutron monitors of two various types: the standard 3-NM-64 and a leadless neutron moderated detector 4NMD at the SANAE South African Antarctic station during a number of large GLE events were compared to precise the specific yield of the NMD at low rigidity range. The parameters of primary relativistic solar protons outside magnetosphere: rigidity spectrum, anisotropy direction and pitch angle distribution were determined on data of the worldwide NM-64 neutron monitor network by modeling technique. The modeling included: definition of asymptotic viewing cones of the neutron monitor (NM) stations under study by the particle trajectory computations in a model magnetosphere Tsyganenko-01 calculation of the NM responses at variable primary solar proton flux parameters; determination of primary solar proton parameters outside the magnetosphere by a least square procedure at comparison of computed NM responses with observations. Then the response of both neutron monitors NM-64 and leadless NMD was calculated using the specific yield functions obtained earlier in the latitude and high-altitude survey of both instruments. By fitting modeled responses to observations in a number of large GLEs the specific yield function for the NMD detector was adjusted so that it precisely described the response to solar cosmic rays.