28 December

Solar wind was nominal. Speed at the ACE spacecraft remained in the
upper 200 to lower 300 km/s range. The phi angle was predominantly
positive for the first half of the period, switching to a more negative
orientation between 28/0000-0900 UTC before returning to a positive
orientation. Bz was generally neutral, ranging between +8 and -5 nT. Bt
began around 9 nT but decreased to about 5 nT after 27/1900 UTC.

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