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.

The solar activity since 1700

The last solar cycles

The following diagram shows the solar activity for the last 30 years.

On 1st July 2015, the sunspot index has been replaced by a homogenized version (comparing old and new). For more information, see SIDC/SILSO.

Current sunspot activity
Fig.1: The daily sunspot index and its monthly and annual average.

The solar activity since 1820

This diagram shows the index of the solar activity since 1820 (Source:SIDC). The light green line displays the daily values. The green and dark green line shows the monthly and annual average. Also added the average for 5.5 years (red) and 30 years (blue).

Solar activity since 1820
Fig.2: Solar activity since 1820 and its daily, monthly, annual, 5.5 years and 30 years smoothing average.

The solar activity since 1700

For a historical overview the following diagram shows the solar activity since 1700. The monthly average is available since 1749.

Solar activity since 1700
Fig.3: Solar activity since 1700.