Case study of Forbush decreases: Energy dependence of the recovery

Case study of Forbush decreases: Energy dependence of the recovery

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...

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Veröffentlicht in:Advances in space research 2007, Vol.40 (3), p.342-347
Hauptverfasser: Jämsén, T., Usoskin, I.G., Räihä, T., Sarkamo, J., Kovaltsov, G.A.
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Cosmic ray
Forbush decrease
Neutron monitor
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container_end_page 347
container_issue 3
container_start_page 342
container_title Advances in space research
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creator Jämsén, T.
Usoskin, I.G.
Räihä, T.
Sarkamo, J.
Kovaltsov, G.A.
description 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.
doi_str_mv 10.1016/j.asr.2007.02.025
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source ScienceDirect Journals (5 years ago - present)
subjects Cosmic ray
Forbush decrease
Neutron monitor
title Case study of Forbush decreases: Energy dependence of the recovery
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