12 March

Solar wind parameters, as measured by the ACE spacecraft, continued to
reflect background conditions. Wind speeds averaged near 310 km/s for
the first half of the period, then began steadily decreasing, ending the
period under 280 km/s. Total IMF (Bt) ranged between 3 and 6 nT, while
the Bz component of the IMF ranged between +/-4 nT. The phi angle began
the period in a positive (away) orientation, but quickly rotated into a
negative (toward) solar sector, where it remained for the rest of the

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