Middle-term cosmic ray monitoring

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 № 2597. The subsequent "double" precursor is registered on rotations № 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 № 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.