3.230.128.106

Current solar activity, sunspot index and sunspot numbers, Observation of sunspots and solar activity forecast, prediction of the solar activity. Sunspots in the northern hemisphere and sunspots of the southern hemisphere. sunspot numbers since 1700, daily sunspot numbers since 1818. solar activity diagram, sun cycle diagrams, strong sun cycle, weak sun cycle. historical solar activity, old solar activity, new definition of solar activity. Galileo Galilei and Wolf. forecast of the next sun cycle, forecast of the next solar cycle, comparing the sun cycles. 22 year Hale cycle, 11 year Schwabe cycle, magnetic polarity, 2300 - 2400 years Hallstatt cycle, 55 years Yoshimura, 85 years Gleißberg cycle, 180 - 210 years Seuss cycle, 180 - 210 years de-Vries cycle, 1470 years cycle of Bond- and Dansgaard-Oeschger events, intensity of the solar wind, solar activity of suns backside. Maunder Minimum, Dalton Minimum, Modern Maximum, Oort Minimum, Mittelalterliches Maximum, Wolf Minimum, Spoerer Minimum. Flares and aurora, space weather, Observatory, solar telescope, SDO, Satellites, brightness of the sun, geomagnetical storms. The Zeeman Effect describes the solar magnetic field as the driver of the sunspots. Royal Observatory of Belgium by the World Data Center.

Solar cycle 4

Archive

The solar cycle 4 lasted from September 1784 to September 1801. The cycle has started with a minimum of 9.5 (monthly average) and reached a maximum of 141.2 (monthly average) in February 1788. The cycle has taken 163 months (13.6 years). The solar activity increased over a period of 40 months (3.4 yers) and declines during the following 122 months (10.2 years).

Diagram of solar cycle 4

Diagram of the solar cycle 4


Solar cycles archive:

The following table is listing the parameters of several parts of the solar cycles. The start, the length, and the duration of the particular phases are shown.

Note:Cycles with a "p" (p13 to p1) are cycles before 1750.

CycleStart yearMinimum valueYear of the maximumMaximum valueIncreasing timeDecreasing timeCycle length
p131610.81615.54.73.58.2
p12161916267815
p1116341639.55.55.511
p10164516494610
p9165516605611
p81666167594.513.5
p71679.516855.54.510
p61689.516933.558.5
p516981705.57.56.514
p417121718.26.25.311.5
p31723.51727.546.510.5
p217341738.74.76.311
p117451750.392.65.34.910.1
11755.1141761.4144.16.35.011.3
21766.418.61769.71933.35.89.0
31775.4121778.3264.22.96.39.3
41784.715.91788.1235.33.410.213.6
51798.35.31805.1826.85.412.3
61810.501816.381.25.87.012.8
71823.30.11829.8119.26.54.010.5
81833.812.21837.2244.93.36.39.7
91843.517.61848.1219.94.67.812.4
101855.961860.1186.24.27.111.3
111867.29.91870.62343.48.311.8
121878.93.71883.9124.45.06.311.3
131890.28.31894.0146.53.88.011.8
141902.04.51906.1107.14.17.411.5
151913.52.51917.6175.74.16.010.1
161923.69.31928.3130.24.75.410.1
171933.75.81937.3198.63.66.810.4
181944.112.91947.3218.73.36.910.2
191954.35.11958.22853.96.610.5
201964.814.31968.8156.64.17.311.4
211976.217.81979.9232.93.86.810.5
221986.713.51989.8212.53.26.89.9
231996.611.22001.8180.35.37.112.3
242008.92.22014.3116.45.35.711.0
252019.91.8

Downloading the data of the solar cycles: ▸solar-cycles.dat