... 1610 (approx) Sunspots and their rotation with the Sun were discovered independently ... 1843 Heinrich Schwabe publishes first evidence for the sunspot cycle. ... 1851 Von Humboldt publishes Schwabe's work; sunspot cycle widely accepted. ...
... Solar cycle (or sunspot cycle )--an irregular cycle, averaging about 11 years in length, during which the number of sunspots (and of their associated outbursts) rises and then drops again. ...
... Faraday's Disk Dynamo . Sunspots . The Dynamo Process on the Sun . The Earth's Dynamo . Dipole Reversals and Plate Tectonics . ... Cowling, Thomas G., The Magnetic Field of Sunspots, Monthly Notices Roy. Astron. Soc., 94, 39, 1933. ...
... Sunspot cycle (or solar cycle)--an irregular cycle, averaging about 11 years in length, during which the number of sunspots (and of their associated outbursts) rises and then drops again. ...
... Includes sections on the Sun and sunspots, with the story of the discovery of the sunspot cycle, also the discovery of the radiation belt by the first US satellites. ...
... Was the magnetosphere involved in the hole in the ozone layer? . Who Discovered Sunspots? . "Soda-Bottle Magnetometer" . ... Oh, and did you know that the polar field of the Sun reverses every sunspot cycle, every 11 years or so? . David Stern . ...
... Earlier observations with the unaided eye have been reported--e.g. in China and Russia--because when the rising or setting Sun is viewed through a thick haze, big sunspots can be distinguished (a few years ago I even watched that way a big double sunspot ...