Australia’s Space Weather Services issued a geomagnetic warning at 0132 UTC
on December 9. It said that due to solar wind from a coronal hole, expect
increased geomagnetic activity on December 10.
Both average daily solar
flux and average daily sunspot numbers were higher over the December 3-9 period
than on the previous week.
Average daily sunspot numbers increased
from 41.6 to 48 and average daily solar flux rose from 97.2 to
102.2.
Geomagnetic indicators rose at well, with planetary A index rising
from 9.9 to 12.6 and mid-latitude A index from 6.6 to 11.1.
Predicted
solar flux for the near term is 112 and 115 on December 11-12, 120 on December
13-15, then 115 on December 16-17, 105 on December 18, 100 on December 19-26, 98
on December 27, 95 on December 28-29, 98 on December 30, 100 on December 31 and
105 on January 1-2, 100 on January 3-4 and 105 on January 5-11.
Predicted
planetary A index is 22, 16 and 12 on December 11-13, then 10, 6, 10 and 6 on
December 13-15, then 10 and 8 on December 16-17, 5 on December 18-26, then 18,
15 and 10 on December 27-29, and 5 on December 30-31, then 15, 20, 18 and 10 on
January 1-4, then 8, 12 and 10 on January 5-7, and 8 on January
8-11.
Today we have an updated geomagnetic forecast from Petr Kolman,
OK1MGW, of the Czech Propagation Interest Group. OK1MGW and OK1HH have made
these weekly forecasts since 1978, 37 years!
Petr expects quiet to active
geomagnetic conditions on December 11, quiet to unsettled December 12, mostly
quiet December 13, quiet to active December 14-15, quiet to unsettled
December 16, quiet December 17-22, mostly quiet December 23, quiet to active
December 24-25, quiet to unsettled December 26-27, active to disturbed December
28, quiet to unsettled December 29, mostly quiet December 30-31, quiet to active
January 1-3, quiet to unsettled January 4, and quiet to active again on January
5-6.
He expects increases in solar wind on December 11, 14-15, 24-25 and
January 1-3 and 5-6...
More here
http://www.arrl.org/news/the-k7ra-solar-update-403
