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WATCH OUT FOR THE HARVEST MOON: According to folklore, this week's full Moon is the "Harvest Moon." Find out from Science@NASA what makes it special: full story, video.
ALL QUIET ALERT: With the Sun's disk almost completely devoid of sunspots, solar flare activity has come to a halt. Measurements by NOAA's GOES 15 satellite show that the sun's global x-ray emission, a key metric of solar activity, has flatlined:
The quiet is unlikely to break this weekend. NOAA forecasters estimate a scant 1% chance of M- or X-class solar flares during the next 24-48 hours.
The quiet spell is a bit strange because 2013 is supposed to be a year of solar maximum, with lots of flares and sunspots. Supporting this view are data from NASA-supported observatories which show that the sun's magnetic field is poised to flip--a long-held sign that Solar Max has arrived. Nevertheless, solar activity is low.
One possible explanation is that Solar Max is double-peaked and we are in the valley between peaks. If so, solar activity could surge again in late 2013-2014. No one can say for sure, though. Researchers have been studying sunspots for more than 400 years, and we still cannot predict the behavior of the solar cycle. Continued quiet or stormy space weather? Both are possible in the weeks and months ahead. Solar flare alerts: text, voice.
Realtime Space Weather Photo Gallery
AURORA WATCH: NOAA forecasters estimate a 45% chance of polar geomagnetic storms on Sept. 16th in response to an incoming solar wind stream. When the solar wind arrives, Arctic skies could look like this:
The display was sparked by a similar solar wind stream on Sept. 13th. "As soon as it was dark enough to see the Lady Aurora, we went out to meet her," says photographer June Grønseth of Laukvik, Lofoten, Norway. "As always, it was a huge pleasure to see her dance, and just leave everything else behind."
Sky watchers around the Arctic Circle should be alert for "Lady Aurora" on Sept. 16-17 as the solar wind approaches. Aurora alerts: text, voice.
Realtime Aurora Photo Gallery
Realtime Noctilucent Cloud Photo Gallery
[previous years: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2011]
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