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 73 Frank W3LPL _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector