Solar activity forecast for the period September 15 - September 21,
2017
Activity level: very low to low
X-ray background flux
(1.0-8.0 A): in the range A3.0-B2.0
Radio flux (10.7 cm): a fluctuation in
the range 69-85 f.u.
Events: class C (0-6/period), class M (0-1/period),
class X (0/period), proton (0-1/period)
Relative sunspot number (Ri): in the
range 11-70
Martina Exnerova
RWC Prague, Astronomical Institute, Solar
Dept., Ondrejov, Czech Republic
e-mail:
sunwatch(at)asu.cas.cz
Geomagnetic activity forecast for the period
September 14 - September 21, 2017
Quiet: Sep 18 - 19,
21
Unsettled: Sep 17 - 21
Active: Sep 14 - 16
Minor storm: Sep 14 -
15
Major storm: 0
Severe storm: 0
Geomagnetic activity
summary:
Because of two CMEs last week, we expect active (with possible minor
storm
event) conditions in the next three days. We expect these conditions
to
September 16, then, we expect geomagnetic activity decrease to
unsettled
level.
An isolated active episode is also possible about
September 20. Then, we
expect quiet to unsettled conditions
return.
Tomas Bayer
RWC Prague
Institute of Geophysics of the ASCR,
Prague
Department of Geomagnetism
Budkov observatory
(BDV)
Geomagnetic activity forecast for the period September 15 - October
11, 2017
Geomagnetic field will be:
quiet on September 23 - 24
mostly quiet on September 20, 27
quiet to unsettled September 19, 21 -
22, October 4, 6
quiet to active on September 15, 17, 25 - 26, 30, October 1
- 3, 7 - 8, 10 - 11
active to disturbed on September 16, 18, 28 - 29,
October 5, 9
Amplifications of the solar wind from coronal holes are
expected
on September 15 - 19, 27 - 29, October (1,) 2 - 5,
(8)
Remark:
- Parenthesis means lower probability of activity
enhancement
and/or lower reliability of prediction.
F. K. Janda,
OK1HH
Czech Propagation Interested Group
OK1HH compiling weekly
forecasts since January 1978
e-mail: ok1hh(at)rsys.cz
