Case study of Forbush decreases: Energy dependence of the recovery |
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Institution: | 1. Sodankylä Geophysical Observatory (Oulu unit), University of Oulu, Finland;2. Centre of Underground Physics in Pyhäsalmi, University of Oulu, Finland;3. Ioffe Physical-Technical Institute, St. Petersburg, Russia |
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Abstract: | Case study is presented for three Forbush decreases in 2004–2005, using cosmic ray data from ground-based detectors – neutron monitors and a muon detector. One of them was a typical event (September 2005), while two other were quite unusual (November 2004 and January 2005). Two unusual features, not expected from the standard theory, are revealed: (1) the recovery time of a Forbush decrease can strongly depend on the energy; (2) an over-recovery is observed in the most energetic cosmic ray data (muon detector). A simple scenario is suggested for the observed phenomenon. |
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