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A large farsided event was detected around old region 2665 beginning at approximately 03:20 UTC (July 23rd). Shortly afterwards, a fast moving, asymmetric halo coronal mass ejection (CME) became visible in LASCO coronagraph imagery. Because the flare location was situated on the farside of the sun, the energetic plasma cloud was directed away from Earth. Had it been directed our way, severe geomagnetic storming would have been likely. Video courtesy of STEREO Ahead and LASCO C2 and C3.
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center.
UPDATED 2017 July 28 0030 UTC
.24 hr Summary...
Solar activity was very low and no significant sunspot activity was
observed this period. No Earth-directed CMEs were observed in available
Solar activity is expected to continue at very low levels throughout the
forecast period (28-30 Jul).
[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.