Solar activity forecast for the period June 23 - June 29, 2017


Activity level: mostly very low to low
X-ray background flux (1.0-8.0 A): in the range A5.0-B1.0
Radio flux (10.7 cm): a fluctuation in the range 69-82 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 11-55

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


Geomagnetic activity forecast for the period June 23 - June 29, 2017


Quiet: Jun 27 - 28
Unsettled: Jun 23 - 25, 29
Active:    Jun 23 - 24
Minor storm: 0
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
Coming the nearest three days, we expect an active episode. Nevertheless,
the local K-index should stay at level 4 (active conditions under minor
storm). Since June 25, we expect decrease of geomagnetic activity to
unsettled level only,  and, since Tuesday, June 27, quiet to unsettled
level.

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


Geomagnetic activity forecast for the period June 23 - July 18, 2017


Geomagnetic field will be:
quiet on June 27, July 4 - 5
mostly quiet on June 28 - 29, July 1, 3, 7, 17
quiet to unsettled June 26, July 2, 6, 12, 18
quiet to active on June 25, 30, July 9 - 11, 15
active to disturbed on June (23 - 24,) July (8,) 13 - 14, 16

Amplifications of the solar wind from coronal holes are expected
on June (26 - 27), July (8,) 9 - 17, (18)

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