Solar activity forecast for the period June 30 - July 6, 2017


Activity level: mostly very low
X-ray background flux (1.0-8.0 A): in the range A4.0-A9.0
Radio flux (10.7 cm): a fluctuation in the range 66-77 f.u.
Events: class C (0-2/period), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-50

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 30 - July 6, 2017


Quiet: Jul 3 - 5
Unsettled: Jun 30 - Jul 2, 5, 6
Active:    possible Jun 30, Jul 2, 6
Minor storm: 0
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
Next week, we expect at most quiet to unsettled level conditions only
with a single active episode. The active episodes are possible about June
30 and also at the end of forecasted time. Geomagnetic activity increase
is possible because of small equatorial coronal hole. Nevertheless, we
expect the grater activity increase at the start of new weekly forecast,
i.e. since July 7.

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


Geomagnetic activity forecast for the period June 30 - July 26, 2017


Geomagnetic field will be:
quiet on July 1, 4 - 5, 17
mostly quiet on July 2, 12, 16, 18 - 20, 24
quiet to unsettled July 6 - 7, 10 - 11, 15, 25 - 26
quiet to active on June 30, July 3, 8 - 9, 14, 21 - 23
active to disturbed on July 13

Amplifications of the solar wind from coronal holes are expected
on July (8,) 9 - 17, (18, 21,) 22 - 24, (25)

Remarks:
- Parenthesis means lower probability of activity enhancement
and/or lower reliability of prediction.
- As a result of ongoing changes to the configuration of active areas
on the Sun, reliability of forecasts is temporarily lowered.

F. K. Janda, OK1HH
Czech Propagation Interested Group
OK1HH compiling weekly forecasts since January 1978
e-mail: ok1hh(at)rsys.cz