Data from the Advanced Composition Explorer (ACE) spacecraft indicated
the continued influence of a positive-polarity CH HSS. Wind speed
started the period at 412 km/s, reached a high of 608 km/s at 01/2127
UTC, and ended the period at approximately 540 km/s. IMF Bt hit a high
of 17 nT at 01/1335 UTC, then began to gradually decrease. IMF Bz ranged
between 9/-14 nT. IMF Phi data indicated a positive-polarity (away)
solar-sector orientation during the period.