G-1 Geomagnetic Storm, Chance of a G-2 Storm 11-12 Sep
by Troy Riedel from The SWLing Post on (#3YGCQ)
From Spaceweather.com:
"NOAA forecasters say there is an 80% chance of minor G1-class geomagnetic storms on Sept. 11th when a stream of solar wind is expected to hit Earth's magnetic field " There's a chance that the storm could intensify to category G2 (moderately strong)."
Image: Solar Wind flowing from this canyon shaped coronal hole could reach Earth on September 11 thru 12th. Credit: SDO/AIA from Spaceweather.com
Will this impact your radio plans over the next two days? Go to Spaceweather.com for updates.
UPDATED 10:30 P.M. EDT:
I just received this update from the Forecast Center:
Product: 3-Day ForecastIssued: 2018 Sep 11 0030 UTCPrepared by the U.S. Dept. of Commerce, NOAA, Space Weather PredictionCenterA. NOAA Geomagnetic Activity Observation and ForecastThe greatest observed 3 hr Kp over the past 24 hours was 5 (NOAA ScaleG1).The greatest expected 3 hr Kp for Sep 11-Sep 13 2018 is 6 (NOAA ScaleG2).NOAA Kp index breakdown Sep 11-Sep 13 2018 Sep 11 Sep 12 Sep 1300-03UT 5 (G1) 4 3 03-06UT 6 (G2) 5 (G1) 4 06-09UT 5 (G1) 4 3 09-12UT 4 3 2 12-15UT 4 2 2 15-18UT 3 2 2 18-21UT 3 2 2 21-00UT 4 2 2 Rationale: The geomagnetic field will likely reach G2 (Moderate) levelson day one( 11 Sep) as a result of a positive polarity CH HSS. Activityis expected to taper some by day two (12 Sep), but G1 (Minor) stormconditions are still likely. Day three (13 Sep) is expected to be a dayof transition, with G1 conditions becoming less likely.
Guest Post by Troy Riedel - career retired Veteran, educated Synoptic Meteorologist & an amateur astronomer hobbyist who likes to also "play shortwave".