15 January

ACE data indicated subsiding CH HSS effects throughout the period. Wind
speed remained elevated for the first half of the summary period,
beginning with speeds just over 650 km/s, and reaching a peak speed of
667 km/s at 14/1442 UTC. Just after the end of the UTC day, speeds began
a gradual but steady decline, ending the period just under 500 km/s. IMF
Bt was steady throughout the period, ranging from 1 nT to 4 nT. IMF Bz
was variable with a range of +2/-4 nT until just after 14/0500 UTC where
it leveled off near 0 nT to +1 nT. IMF Phi data indicated a
negative-polarity (Toward) solar sector during the period.

Leave a Reply