Solar activity forecast for the period October 6 - October 12, 2017


Activity level: mostly very low to low
X-ray background flux (1.0-8.0 A): in the range A5.0-B2.5
Radio flux (10.7 cm): a fluctuation in the range 70-90 f.u.
Events: class C (0-5/period), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-60

Tomas Baha
RWC Prague, Astronomical Institute, Solar Dept., Ondrejov, Czech Republic
e-mail: sunwatch(at)asu.cas.cz


Geomagnetic activity forecast for the period October 6 - October 12, 2017


Quiet: Oct 6 - 7
Unsettled: Oct 7 - 9, 12
Active:    Oct 8 - 9, 11
Minor storm: possible Oct 10 - 11
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
The first active episode is expected between October 8-9. Till this event,
we expect quiet to unsettled conditions. October 9-10, we expect
geomagnetic activity decrease to unsettled level, and, October 10 - 11,
active conditions return. This event can be accompanied by minor storm
event.

Tomas Bayer
RWC Prague
Institute of Geophysics of the ASCR, Prague
Department of Geomagnetism
Budkov observatory (BDV)


Geomagnetic activity forecast for the period October 6 - November 1, 2017


Geomagnetic field will be:
quiet on October 7, 22 - 23, 30
mostly quiet on October 6, 17 - 19, 21, 29
quiet to unsettled October 10, 15 - 16, 28, 31, November 1
quiet to active on October 8, 11, 13 - 14, 20, 24, 27
active to disturbed on October 9, 12, 25 - 26

Amplifications of the solar wind, mostly from coronal holes, are expected
on October (6,) 11 - 16, (17 - 18, 21 - 22, 24,) 25

Remark:
- Amplifications of the solar wind - prediction is less reliable at present.
- 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