1st December

Solar wind speed at the ACE spacecraft exhibited a gradual increasing
trend from about 385 km/s to near 460 km/s at period’s end. The IMF
total field (Bt) generally ranged from 8-11 nT. The Bz component was
variable between +9 to -8 nT through about 30/2100 UTC when the field
remained mostly north to about +5 nT. The Phi angle remained in a
predominately negative (towards) orientation. Low energy particles
detected by the EPAM instrument began rising slowly during the past 24
hours, perhaps signaling the approach of a co-rotating interaction
region in advance of an anticipated coronal hole high speed stream (CH
HSS).

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