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Today there was very little band noise in the morning (1200-1700 UTC ).
SWPC did
not report any X-ray flares. Also, the preceding day's band noise took
longer
than usual to decay. Was there a CME impact to the geomagnetic field today
or
yesterday? The K-index was high, but was it CME-impact high? Something
of a
mystery. Spectrograms from the 17th through 21st show the normal sunrise
onset
of band noise propagation.