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After several days of relative calm on the farside of the sun, old region 2673 erupted earlier today and produced a large farsided coronal mass ejection (CME). Attached video capturing the solar flare is courtesy of STEREO Ahead and the CME video by LASCO C2. Because this event took place on the opposite side of the sun in relation to Earth, it is directed completely away from our planet. The active region is still about a week away from returning back into Earth view.
September 16, 2017 @ 18:15 UTC
Storm Watch Extended
A persistent high speed solar wind stream continues near 700 km/s today and a minor (G1) storm watch has been extended until tomorrow (Sept. 17). High latitude sky watchers, especially around the Arctic Circle should remain alert for visible aurora once dark outside.
Below is an outstanding photo captured a few days ago in Alaska by Marco Brotto. Great job!
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center.
UPDATED 2017 Sept 21 1230 UTC
.24 hr Summary...
Solar activity was very low with a few B-class flares observed.
NOAA/SWPC Region 2681 (S12E67, Hsx/alpha) was assigned and produced
several B-class flares. Region 2680 (N08W73, Hsx/alpha) was little
changed, but produced the largest B-class flare of the period, a B8
flare at 20/1932 UTC. No Earth-directed CMEs were observed in available
Solar activity is expected to be very low, with a slight chance for
C-class flares all three days (21-23 Sep) due to the combined flare
potential of Regions 2681 and 2680.
[Report of Solar-Geophysical Activity]
A - Alpha (single polarity spot).
B - Beta (bipolar spot configuration).
G - Gamma (atypical mixture of polarities).
BG - Beta-Gamma (mixture of polarities in a dominantly bipolar configuration).
D - Delta (opposite polarity umbrae within single penumbra).
BD - Beta with a Delta configuration.
BGD - Beta-Gamma with a Delta configuration.