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
spaceweather.com
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