16 December

Solar wind parameters, measured at ACE, were indicative of a nominal
solar wind environment. Solar wind speed ranged from 450 – 500 km/s
throughout the period. The total field strength values ranged from 2 nT
to 9 nT and the Bz component ranged from +5 nT to -4 nT. The phi angle
transitioned from a positive (away) sector to a negative (toward) sector
at around 16/0800 UTC.

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