Solar activity forecast for the period September 11 - 17, 2015

Activity level: mostly very low to low
X-ray background flux (1.0-8.0 A): in the range A9.0-B7.0
Radio flux (10.7 cm): a fluctuation in the range 80-120 f.u.
Events: class C (0-12/day), class M (0-4/period), class X (0/period),
        proton (0/period)
Relative sunspot number (Ri): in the range 10-80

Jozef Lesko
RWC Prague, Astronomical Institute, Solar Dept., Ondrejov, Czech Republic
e-mail: sunwatch(at)asu.cas.cz
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Geomagnetic activity forecast for the period September 11 - 17, 2015

At the start of forecasted week, we expect continuing active conditions.
September 11 and 12, we expect unsettled to active conditions with minor
storm possible.
Sunday, Sep 13, and Monday, 14, we expect at most unsettled conditions
with active episode possible.
The last days, quiet to unsettled conditions are probable.

Tomas Bayer
Institute of Geophysics ASCR
Budkov Geomagnetic Observatory (BDV)
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Geomagnetic activity forecast for the period September 11 - 30, 2015

Geomagnetic field will be:
quiet on September 26 - 28
mostly quiet on September 20 - 21, 29
quiet to unsettled on September 14, 17 - 18, 25, 30
quiet to active on September 11 - 13, 15 - 16, 22
active to disturbed on September (11), (15),19, 23 - 24

Amplifications of the solar wind are expected on September 11 - 13,
15 - 16, 19, 22 - 24


Remarks:
- Reliability of predictions remains reduced in present solar cycle phase.
- Parenthesis means lower probability of activity enhancement.

Petr Kolman, OK1MGW
Czech Propagation Interested Group
(OK1HH & OK1MGW, weekly forecasts since 1978)
e-mail: kolmanp(at)razdva.cz