G1 – Minor geomagnetic storm in progress
A negative polarity, southern crown coronal hole extension has moved into a geoeffective position enhancing the solar wind environment. Unsettled levels are expected on April 21 as high speed stream (HSS) effects persist. By late April 22 (UTC), a positive polarity coronal hole high speed stream (CH HSS) is expected to become geoeffective causing quiet to unsettled conditions.
Geomagnetic K-index of 4 threshold was reached at 08:57 UTC on April 20, followed by K-index of 5 (G1 – Minor geomagnetic storm) at 10:44 UTC.
***
Space Weather Message Code: ALTK04
Serial Number: 2154
Issue Time: 2020 Apr 20 0857 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2020 Apr 20 0855 UTC
Synoptic Period: 0600-0900 UTC
Active Warning: Yes
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents – Weak power grid fluctuations can occur.
Aurora – Aurora may be visible at high latitudes such as Canada and Alaska.
***
Space Weather Message Code: ALTK05
Serial Number: 1293
Issue Time: 2020 Apr 20 1045 UTC
ALERT: Geomagnetic K-index of 5
Threshold Reached: 2020 Apr 20 1044 UTC
Synoptic Period: 0900-1200 UTC
Active Warning: Yes
NOAA Scale: G1 – Minor
NOAA Space Weather Scale descriptions can be found at
www.swpc.noaa.gov/noaa-scales-explanation
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 credit: NOAA/SWPC
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When the Day Dawn’s then the light of the world will come. “you know this”
It is the rainbow of creation and life.
C’est magnifique à voir.
Se sont les conséquences qui sont à craindre mais celle-ci est mineure.
Bonne journée.