A bimodal distribution around the sunspot cycle maximum was suggested to
exit for solar-terrestrial parameters (Storini et al., Adv. Space Res. 31, n° 4, 895-
900, 2003). The period between the two activity peaks was called the
Gnevyshev Gap by the Rome Cosmic Ray Group (Storini and Pase, GBRSC News
5, Special Issue, 255-258, 1995) and it is world-wide accepted by the scientific
communit
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