Average daily sunspot numbers dropped from 31.6 to 21.3 last week, and average
daily solar flux declined from 78.2 to 73.5. The sunspot number was zero on
February 8, but recovered to 15 on February 9, with the appearance of one new
sunspot group.
Average planetary A index went
from 15.6 to 12.9, and average mid-latitude A index from 11.4 to 9.9.
F.K. Janda, OK1HH, sends this
geomagnetic activity forecast for the period February 10-March 9, 2017.
“Geomagnetic field will
be:
Quiet on February 10-11, 13-14, 21, 23-24, 26, March 8-9
Mostly
quiet on February 12, 15, 19, March 7
Quiet to unsettled-sometimes, hardly to
be forecasted
Quiet to active on February 17, 20, 22, 25, 27, March
3-6
Active to disturbed on February 16, 18, 28, March 1-2
Amplifications of the solar wind
from coronal holes are expected on February 16-21, (22,) 26-27.
- Parenthesis means lower
probability of activity enhancement.”
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