19 December

Solar wind parameters, measured at ACE, reflected nominal background
conditions. Solar wind speeds remained between 331 and 390 km/s,
reaching a peak speed of 390 km/s at 1444 UTC. The total field strength
values ranged from 2 nT to 6 nT while the Bz component fluctuated
between +5/-6 nT. The phi angle was predominately in a negative (toward)
orientation for the past 24 hours with an occasional interlude into a
positive (away) orientation.

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