From Space Weather.com
AURORA WATCH: A solar wind stream is expected to hit Earth late on July 19th, and this could spark G1-class geomagnetic storms around the poles. High-latitude sky watchers should be alert for auroras, especially in the southern hemisphere where dark winter skies favour visibility of faint lights. [aurora gallery]
BIG SUNSPOTS: Solar activity has been low for months. This could soon change. Two big sunspot groups are directly facing Earth, and one of them has an unstable magnetic field that poses a threat for M-class solar flares. Bill Hrudey photographed the active regions on July 16th from Cayman islands:
“Sunspots AR2567 & AR2565 are great imaging targets surrounded by many granules,” says Hrudey.
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As if granules weren’t big enough, the primary dark cores of these sunspots are twice as wide as the entire Earth. Great targets indeed. If you have a solar telescope, take a look.