18 December

Solar wind parameters, measured at ACE, reflected nominal background
conditions. Solar wind speed began the period near 400 km/s, reached a
peak speed of 447 km/s, then steadily decreased to end the period near
355 km/s. The total field strength values ranged from 2 nT to 4 nT while
the Bz component fluctuated between +/-4 nT. The phi angle remained in a
negative (away) orientation for the past 24 hours.

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