Solar activity forecast for the period June 16 - June 22, 2017


Activity level: mostly very low to low
X-ray background flux (1.0-8.0 A): in the range A5.5-B2.0
Radio flux (10.7 cm): a fluctuation in the range 70-85 f.u.
Events: class C (0-6/period), class M (0-1/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 11-75

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


Geomagnetic activity forecast for the period June 16 - June 22, 2017


Quiet: Jun 20 - 21
Unsettled: Jun 19 - 20
Active:    Jun 16 - 17, possibly also 22
Minor storm: 0
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
Because of larger coronal hole, we expect the next active episode about
Friday, Jun 16. Then, we expect geomagnetic activity decrease to unsettled
(or quiet to unsettled, respectively) level. An other active episode can
occur also at the end of the forecasted time, June 22.

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


Geomagnetic activity forecast for the period June 16 - July 11, 2017


Geomagnetic field will be:
quiet on June 20 - 22, 27, July 1, 4 - 5, 7
mostly quiet on June 26, 28, July 6
quiet to unsettled June 18 - 19, 26, July 3
quiet to active on June 17, 25, 29 - 30, July 2, 8, 11
active to disturbed on June (16, 23 - 24,) July (9 - 10)

Amplifications of the solar wind from coronal holes are expected
on June 16 - 19 (20, 26 - 27), July (8,) 9 - 11

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