30TH INTERNATIONAL COSMIC RAY CONFERENCE More on the Gnevyshev Gap During the 11-year Solar Activity Cycle

Abstract: Structured activity maxima are detected, in all the solar atmospheric layers up to the inter-planetary space, during the 11-y sunspot cycles. A clear trace of a dual-peak maximum was found in past work and here is confirmed for cycle 23, remarking the relevance of the time interval between the two activity peaks (the so-called Gnevyshev Gap) for Space Mission planning. Results supporting the Gnevyshev Gap definition are derived by analysing the 27-d periodicity of Kp and Dst indices