... 16. The Sun . 16H. History: 1843--Heinrich Schwabe discovers the sunspot cycle. 16a. Discovery of Sunspot Cycle . 16b. Discovery of Solar Flares 17. ...
... We'll come to that later.) . Sunspots are sources of strong magnetism. ... In between sunspot groups, field lines stick out like blades of grass after a rain ... So--where do you think sunspots are found--in coronal holes or outside them? ...
... source of magnetism in nature, after sunspots were found to be intensely magnetic ... But sunspot magnetism left little doubt: at least some magnetic fields in nature ...
... Why are sunspots intensely magnetic --when their temperature is so high that they ... in California--analyzed the light of sunspots, and found evidence that they were all ... Whatever made sunspots magnetic could not be permanent magnetism. ...
... has its violent outbursts, especially around the peak of its 11-year sunspot cycle ... outbursts seem to be associated with sunspots, strongly magnetic areas on the Sun ...
... It was the Zeeman splitting of spectral lines emitted from sunspots that led George Ellery Hale in 1908 to realize that sunspots were in fact strongly magnetized, to about 1500 gauss (0.15 Tesla). ...