[RSM] FW: [CQ-Contest] Geomagnetic storms likely to commence on 9 December, reaching strong storm level on 10 December

[ed_richardson at shaw.ca]

Not sure of the possible effects on ths weekends upcoming 10m contest.

Ed Richardson


Geomagnetic storm watches are in effect from 9-11 December , due to coronal
mass ejection (CME) effects from a direct CME collision with the Earth's
magnetosphere on 9-11 December. The CME eruption was associated with a C7
solar flare erupting from Sunspot Region 2790 on 7 December. 

www.swpc.noaa.gov/news/geomagnetic-storm-watches-9-11-december-2020 

Arrival of a shock wave associated with the CME is possible late on
9 December, initially resulting in a G1 level minor geomagnetic storm. 
As CME effects continue, geomagnetic disturbance is likely to increase,
especially if the magnetic field carried with the CME rotates to a southward
orientation, causing magnetic reconnection with the Earth's opposite
polarity magnetosphere. 

The potential for strong storm levels exists and a G3 strong geomagnetic
storm level w atch is in effect for 10 December. CME-related geomagnetic
disturbances are forecast to continue through 11 December, likely resulting
in G2 moderate geomagnetic storm levels - and another geomagnetic storm
watch has been issued accordingly. 

While SWPC forecasters are fairly confident in CME arrival at Earth, timing
and geomagnetic storm intensity are less certain. Continue to monitor the
SWPC webpage for the latest conditions and forecast. 

www.swpc.noaa.gov/products/alerts-watches-and-warnings 

www.solarham.net/geo_forecast.htm 

www.swpc.noaa.gov/products/wsa-enlil-solar-wind-prediction