venerdì 7 luglio 2017

CHANCE OF STORMS THIS WEEKEND: NOAA forecasters say there is a 60% chance of minor G1-class geomagnetic storms on July 9th when a high-speed solar wind stream is expected to hit Earth's magnetic field. The stream of gas is flowing from a large hole in the sun's atmosphere, now facing Earth. Unfortunately, bright moonlight will interfere with the visibility of auroras, which might otherwise be seen at high latitudes. Free: Aurora Alerts
SUNSPOT GROWING RAPIDLY: New sunspot AR2664, which appeared just yesterday, has already more than doubled in size. NASA's Solar Dynamics Observatory documented the sunspot's rapid development in this 36-hour time lapse movie:
So far the sunspot has not produced any strong solar flares, but this could change if the sunspot's breakneck growth destabilizes its magnetic field. Amateur astronomers are encouraged to monitor this expanding sunspot. With one dark core twice as wide as Earth and many more cores larger than the Moon, AR2665 is an easy target for backyard solar telescopes. Free: Aurora Alerts

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