11th September

Solar wind parameters at ACE continued to indicate a nominal solar wind
regime. Solar wind speeds began the period near 370 km/s, reached a peak
just over 400 km/s, and ended the period near 380 km/s. IMF total field
values varied slightly between 6 nT and 9 nT throughout the period,
while Bz fluctuated between +/-7 nT. Phi angle remained in a negative
(toward) orientation throughout the majority of the period, however a
solar sector boundary change to a positive (away) orientation was
observed at approximately 10/2140 UTC.

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