Study on solar and cosmic ray activities and their periodic behaviour

Partha Chowdhury*
Department of Instrumentation Science, Jadavpur University, West Bengal, India

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Abstract

This thesis studies the short and mid-term periodicities of different solar indices and galactic cosmic ray data from different neutron monitor stations and their time-variability for cycles 21-23. Hysteresis effects between solar and cosmic ray data also have been investigated. Possible explanations of detected periodicities are discussed.

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Keywords : Sun: flares – Sun: oscillations