Definitions for "Solar minimum"
The time during the solar cycle when the Sun is in line with its magnetic poles as it has completed an 180 degree reversal, causing less solar activity
The month(s) during the Solar Cycle when the twelve-month mean (average) of monthly average sunspot numbers reaches a minimum. The most recent minimum occurred in September 1986. ( go to first use in the text)
The time at which the Sun reaches its lowest point in solar activity as defined by the 12-month smoothed value of the sunspot number.