Solar wind speed at ACE began the period at about 450 km/s and gradually
declined to end-of-period speeds near 390 km/s. Phi was in a positive
(away) orientation through about 15/0500 UTC when a switch to a more
negative (towards) orientation occurred. Bz varied from -4 to +5 nT
early in the period. After 14/2000 UTC, Bz did not vary much beyond +/-
2 nT. Bt reached a maximum of 9 nT early in the period and remained
steady at about 5 nT for a majority of the time.