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Solar minimum is the regular period of least solar activity in the Sun's 11-year solar cycle. During solar minimum, sunspot and solar flare activity diminishes, and often does not occur for days at a time. On average, the solar cycle takes about 11 years to go from one solar minimum to the next, with duration observed varying from 9 to 14 years.
The start of solar cycle 25 was declared by SIDC on September 15, 2020 as being in December 2019. [9] This makes cycle 24 the only "11-year solar cycle" to have lasted precisely 11 years. Details of cycles 1 to 25
During the solar cycle's declining phase, energy shifts from the internal toroidal magnetic field to the external poloidal field, and sunspots diminish in number. At solar minimum, the toroidal field is, correspondingly, at minimum strength, sunspots are relatively rare and the poloidal field is at maximum strength.
Solar cycle 25 is the current solar cycle, the 25th since 1755, when extensive recording of solar sunspot activity began. It began in December 2019 with a minimum smoothed sunspot number of 1.8. [ 2 ]
Solar cycle 1; Solar cycle 2; Solar cycle 3; Solar cycle 4; Solar cycle 5; Solar cycle 6; Solar cycle 7; Solar cycle 8; Solar cycle 9; Solar cycle 10; Solar cycle 11; Solar cycle 12; Solar cycle 13; Solar cycle 14; Solar cycle 15; Solar cycle 16; Solar cycle 17; Solar cycle 18; Solar cycle 19; Solar cycle 20; Solar cycle 21; Solar cycle 22 ...
The Dalton minimum in the 400-year history of sunspot numbers. The Dalton Minimum was a period of low sunspot count, representing low solar activity, named after the English meteorologist John Dalton, lasting from about 1790 to 1830 [1] or 1796 to 1820, [2] corresponding to the period solar cycle 4 to solar cycle 7.
Wilfried Schröder published a table of observed aurora borealis during the Spörer Minimum which showed that the solar cycle was active. [4] Miyahara et al. likewise found the 11-year solar cycle was still prominently detected in the carbon-14 record even during the minimum. The amplitude of the 11-year cycle seems to have been modulated only ...
The Dalton minimum in the 400-year history of sunspot numbers, showing the low peaks for solar cycles 5 and 6. Solar cycle 5 was the fifth solar cycle since 1755, when extensive recording of solar sunspot activity began. [1] [2] The solar cycle lasted 12.3 years, beginning in April 1798 and ending in August 1810 (thus falling within the Dalton ...