Forbush decreases of cosmic rays: Energy dependence of the recovery phase

  • Usoskin I
  • Braun I
  • Gladysheva O
 et al. 
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Cause and general shape of Forbush decreases of cosmic rays are
relatively well understood, however, the knowledge of their recovery
times remains rather poor. Earlier results of theoretical and
fragmentary statistical studies are in disagreement whether the recovery
time does or does not depend on the energy of cosmic rays. A thorough
empirical study of the recovery phase of strong isolated Forbush
decreases is presented here, based on the ground based data from the
World Neutron Monitor Network since 1964 and three ground based muon
telescopes since 1973. In total 39 strong Forbush decreases, suitable
for the analysis, have been identified for the period 1964-2006, 24 of
them depicting a clear energy dependence of the recovery time and 15
consistent with no energy dependence. All analyzed Forbush decreases
with magnitudes exceeding 10% demonstrate an energy dependence of the
recovery time, while smaller events can be of either type. No apparent
relation between the occurrence of energy dependent/independent recovery
and the IMF polarity has been found. This result provides an
observational constraint for more detailed modeling of the propagation
of interplanetary transients and their dynamic effects on cosmic ray

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