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主題: magnetic field of the Sun operates on a 22 year cycle 作者: peter 於 2018-02-27 09:00:35 https://www.universetoday.com/138664/22-years-of-the-sun-from-soho/
(https://www.universetoday.com/wp-content/uploads/2018/02/22_years_of_SOHO-700x432.jpg) The magnetic field of the Sun operates on a 22 year cycle. It takes 11 years for the orientation of the field to flip between the northern and southern hemisphere, and another 11 years to flip back to its original orientation. This composite image is made up of snapshots of the Sun taken with the Extreme ultraviolet Imaging Telescope on SOHO. Image: SOHO (ESA & NASA) |