Solar wind speed at the ACE spacecraft declined from around 500 km/s to
end the period in the upper 300 km/s range. Phi remained negative
throughout the period. Bt reached a peak near 18 nT at 06/0200 UTC
while Bz remained mostly neutral or positive through most of the period,
although it did dip to near -5 nT at 05/1445 UTC. Density showed a
steady increase between 05/15-22 UTC before dropping abruptly.