Evidence from Galactic Cosmic Rays That the Sun Has Likely Entered A Secular Minimum in Solar Activity

Since the beginning of space age, Sun has been in a multi-cycle period elevated activity (secular maximum). This secular maximum is longest last 9300 years. end solar cycle 21 (SC21), however, shown decline overall activity, which remarkably increased fluxes galactic cosmic rays (GCRs). Here, we investigate correlation between modulation GCRs, heliospheric magnetic field, and wind speed for 24 cycles to find trends that can potentially be used predict future activity. Specifically, develop tool predicting field intensity, based on hysteresis GCR variation, during phases current cycle. method estimates SC25 will as weak or weaker than SC24. would mean likely entered minimum, which, according historical records, should another two (SC25 SC26).