ACE data hinted at possible weak, positive-polarity high-speed stream
effects, given the enhanced solar wind speed and temperature. Wind speed
was in the 350 to 446 km/s range. IMF Bt (total field) ranged from 2 to
7 nT. The Bz component of the IMF was in the 6 to -5 nT range with a
mostly-southward period during approximately 31/1330 – 1630 UTC. IMF Phi
values reflected a positive-polarity sector for most of the period.