30th December

Solar wind speed at the ACE spacecraft increased over the period from
around 430 km/s to near 755 km/s over the period. Bt reached a maximum
of 15 nT while Bz dipped as low as -10 nT. Bt began to decrease and Bz
became more neutral toward the end of the period. These observations
suggest the presence of a high speed solar wind stream.

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