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The ARRL Solar Update
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American Radio Relay League | Ham Radio Association and Resources
Solar activity is expected to be low, with a chance for anisolated M-flare (R1-R2/minor-moderate), through September 20.
Solar wind parameters were indicative of coronal hole high speedstream (CH HSS) influences.
Solar wind speed increased to near 760km/s early on September 15 before subsiding to between 600-700 km/s.
Solar wind parameters are expected to continue under the influenceof a negative polarity Coronal Hole High Speed Stream.
Predictions of when the intensified solar wind from its edgeswould reach Earth rarely coincided on Sunday, September 14.