Partial-halo CME to deliver glancing blow on June 23


Filament eruption in the SSE quadrant of the Sun produced a partial-halo Coronal Mass Ejection (CME) first observed in coronagraph imagery near 08:45 UTC on June 19 (above). WSA-Enlil model suggests a glancing blow early on June 23. 

Beta-Gamma-Delta classified Region 2371 produced two M-class solar flares since it rotated into Earth view a couple of days ago. Long duration M3.0 flare produced full-halo CME at 17:35 UTC on June 18 which will likely make a glancing blow at Earth late June 21 or early June 22. 

Image credit: NASA/ESA SOHO/LASCO C2.

The region's second M-class solar flare took place from 06:28 to 07:09 UTC, it peaked at 06:48 UTC as M1.0. 

G1-Minor Geomagnetic Storm Watch is now in effect for the UTC day of June 22 through the 23rd.

Credit: NOAA/SWPC WSA-Enlil model.


Space Weather Message Code: WATA20
Serial Number: 635
Issue Time: 2015 Jun 20 1007 UTC

WATCH: Geomagnetic Storm Category G1 Predicted

Highest Storm Level Predicted by Day:
Jun 21:  None (Below G1)   Jun 22:  G1 (Minor)   Jun 23:  G1 (Minor)


NOAA Space Weather Scale descriptions can be found at

Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents – Weak power grid fluctuations can occur.
Spacecraft – Minor impact on satellite operations possible.
Aurora – Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.


Featured image: Partial halo CME on June 19, 2015. Credits: NASA/SDO AIA 304 and NASA/ESA SOHO/LASCO C2 & C3.


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