Now we are looking on the crossword clue for: Solar phenomena.
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Possible Answers:
SUNSPOTS.
Last seen on: The Washington Post Crossword – Jul 2 2019
Random information on the term “Solar phenomena”:
Coronal holes are areas where the Sun’s corona is colder, hence darker, and has lower-density plasma than average because there is lower energy and gas levels. Coronal holes are part of the Sun’s corona and are constantly changing and reshaping because the corona is not uniform. The Sun contains magnetic fields that arch away from areas in the corona that are very thin due to the lower levels of energy and gas, which cause coronal holes to appear when they do not fall back. Thus, solar particles escape at a rate great enough to create a lower density and lower temperature in that area.
In the 1960s, they showed up on X-ray images taken by sounding rockets and in observations at radio wavelengths by the Sydney Chris Cross radio telescope, but at the time it was unclear what they were. Their true nature was recognized in the 1970s when X-ray telescopes in the Skylab mission were flown above the Earth’s atmosphere to reveal the structure of the corona.