مفهوم
الدورة الشمسية
The roughly 11-year rise and fall of solar activity, numbered since Solar Cycle 1 in 1755; Solar Cycle 25 began in December 2019 and Cycle 26 is expected between 2029 and 2032.
دورة النشاط الشمسي11-year solar cycle
مفهوم
The roughly 11-year rise and fall of solar activity, numbered since Solar Cycle 1 in 1755; Solar Cycle 25 began in December 2019 and Cycle 26 is expected between 2029 and 2032.