15th October


The solar wind environment remained disturbed for the first half of the
period in response to a glancing blow passage of a CME observed on 10
October, possible mixed with effects from a coronal hole high speed
solar wind stream. Bt reached 16 nT while Bz dipped as low as -12 nT
between 14/1200-15/0000 UTC, fluctuating between periods of northward
and southward orientation. After 00Z, Bt began to decrease and Bz
became predominantly positive. Solar wind speed was initially between
400-450 km/s and increased to a maximum of 580 km/s at 15/0040 UTC.
This increase was coincident with a modest rise in temperature and a
primarily negative Phi orientation.

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