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Although accurate at the time of publication, it is no longer being updated. The page may contain broken links or outdated information, and parts may not function in current web browsers.
Origins of solar activity: 1. The Sun, like Earth, has an internal dynamo, that generates a magnetic field. 2. Unlike Earth, the Sun’s outer layer rotates differentially. The differential is large: visible features at the equator rotate fully in about 25 days, whereas at the poles, they take nearly 35 days. This complicates the Sun’s magnetism, making it highly variable.
Above is background material for archival reference only.
