Tad Cook, K7RA, Seattle, reports:

Solar Cycle 25 sunspots persisted on January 9 – 10, with daily sunspot numbers of 14 and 11, respectively. This brought the weekly average daily sunspot number from 8.4 last week to 3.6 this week. Average daily solar flux edged up from 71.8 to 72.5.

The average daily planetary A index declined from 6.3 to 5.6, and the average middle latitude A index went from 5.3 to 3.7.
Predicted solar flux for the next 45 days is 71 on January 16 – 18; 70 on January 19 – 23; 72 on January 24 – 25; 70 on January 26 – February 7; 72 on February 8 – 22, and 70 on February 23 – 29.

Predicted planetary A index is 5 on January 16 – 18; 8 on January 19 – 20; 5 on January 21 – 31; 8 on February 1 – 2; 5 on February 3; 10 on February 4 – 6; 5 on February 7 – 9; 10 on February 10 – 11; 5 on February 12 – 22; 8 on February 23 – 24; 5 on February 25 – 27, and 8 on February 28 – 29.

Sunspot numbers for January 9 – 15 were 14, 11, 0, 0, 0, 0, and 0, with a mean of 3.6. The 10.7-centimeter flux was 74.4, 72.8, 73.5, 71.9, 71.5, 71.9, and 71.2, with a mean of 72.5. Estimated planetary A indices were 12, 7, 6, 4, 3, 3, and 4, with a mean of 5.6. The middle latitude A index was 8, 6, 4, 2, 2, 2, and 2, with a mean of 3.7.

ARRL News Letter on January 16, 2020