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Middle-term cosmic ray monitoring
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Cosmic ray count rate at Oulu station (Finland) in pulses per 5 minutes, averaged over 7776
points of 5-min values ​​during each solar rotation - blue dotted curve, scale on the right for the
time interval starting from the 2409-2608 rotation. 27-day values ​​of the CR fluctuation
parameter in relative units - solid red curve, scale on the left. 90% significance level is shown.
CR fluctuation parameter values ​​exceeding the "cosmic noise" region (shown in green) are
harbingers of increased solar activity. The precursor of the beginning of the maximum of the
25th cycle - the one on the far right (shown by the vertical arrow - dotted red line) is registered
on the rotation в„– 2597. The subsequent "double" precursor is registered on rotations в„– 2602-
2603 in May-June 2024. On the contrary, a fairly low - diagnostic value of the CR fluctuation
parameter (the penultimate point in red, revolution в„– 2599, March 2024, as well as on the last
two revolutions 2607-2608), is defined as - a marker of the MAXIMUM of the new 25th cycle.
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