13 December


Solar activity was low. Region 1921 (N06E29, Cko/Beta) produced a C5/Sf
flare at 12/2214 UTC, which was the largest event of the period. Region
1917 (S15W03, Dao/beta-gamma) produced a C4 flare at 13/0315 UTC and
exhibited slight growth throughout the period, both in overall size and
magnetic complexity. New Region 1925 (S09E62, Cro/beta) was numbered
this period. The other regions on the visible disk were either stable
or exhibited slight decay. No Earth-directed coronal mass ejections
(CMEs) were observed this period.

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