While the summer Sporadic-E season from late April to early August is well known, there is also a much smaller Sporadic-E season during the mid-winter.
On the 14th of January 2025, there was one such opening in North America. This one was a bit unusual in that it happened during the hours of darkness and the maximum usable frequency (MUF) went as high as 107.7 MHz.
Mike Schaffer, KA3JAW writes... "There was a good Sporadic-E opening on the 88-108 MHz FM broadcast band on the 14th of January 2025. There was USA Winter Season FM Es reported on three spotters, Wlogger, FMLIST, DXMAPS during the midnight hours up to the top of the band.
Two events - the first occurred from 0506 - 0655 UTC from the Northeast to the upper Midwest. The second shorter event from 2313 - 2323 UTC was from the Northeast to the lower Midwest."
Looking through the logs, the minimum skip distance was 952kms while the longest was 2289kms, close to the maximum for one hop Sporadic-E.
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