At 2256 UTC on June 16 the Australian Space Weather Forecast Centre
issued a geomagnetic warning: "The solar wind speed on UT day 15-Jun
has increased as the Earth entered a coronal hole wind stream after
15/0545UT. Increased geomagnetic activity is expected for 16-Jun
with isolated periods of G1-Minor level activity."
Earlier in the day I checked the NOAA planetary K index page, and it
showed a jump...
