5th January 2016

.24 hr Summary…
Solar wind parameters, as measured by the ACE spacecraft, reflected
mostly nominal conditions for the majority of the day with a minor
enhancement towards the end of the period. Total magnetic field strength
(Bt) was around 5-8 nT for most of the period. After 05/0800 UTC there
was a gradual increase to a peak of 11 nT. The Bz component of the
magnetic field was predominantly northward. Wind speeds underwent a
decline with winds beginning the period around 450 km/s and trending
downward to around 370 km/s before increasing to above 420 km/s by the
period’s end. Phi angle was oriented in the positive sector (away from
the Sun).

Solar wind parameters are expected to remain near background levels on
day one (05 Jan) under a mostly nominal solar wind regime. A solar wind
enhancement is expected on day two (06 Jan) due to the onset of a
co-rotating interaction region (CIR) followed by the influence of a
positive polarity CH HSS. Wind speeds in excess of 650 km/s were
observed from this HSS last rotation. On day three (07 Jan), CH HSS
effects are expected to persist.

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