Weekly forecast

Forecast issued date:

Solar activity forecast for the period May 17 - May 23, 2019

Activity level: mostly very low
X-ray background flux (1.0-8.0 A): in the range A4.0-B1.0
Radio flux (10.7 cm): a fluctuation in the range 69-75 f.u.
Events: class C (0-1/period), class M (0/period), class X (0/period), proton (0/period)
Relative sunspot number (Ri): in the range 0-25

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

Geomagnetic activity forecast for the period May 17 - May 23, 2019

Quiet: May 18 - 19, 22 - 23
Unsettled: May 17 - 18, 20 - 21
Active: May 16 - 17
Minor storm: 0
Major storm: 0
Severe storm: 0

Geomagnetic activity summary:
The local geomagnetic activity had reached the minor storm level (local K-index=5) at Tuesday, May 14.
We expect continuing the active level during the two coming days (May 17 - 18), and also, unsettled to active conditions are possible about May 20 - 21. Since Saturday, May 18, we expect quiet to unsettled conditions return. These conditions can be interrupted by unsettled to active episode caused by coronal hole 5/-3. Then, May 22 - 23, we expect quiet to unsettled conditions return.

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

Geomagnetic activity forecast for the period May 17 - June 12, 2019

Geomagnetic field will be: 
quiet on May 23, 26 - 27 
quiet to unsettled on May 19, 21, 24 - 25, June 1 - 12 
quiet to active on May 22, 30 
unsettled to active on May 18, 20, 28 - 29 , 31 
active to disturbed 17 
 
Solar wind will intensify on May 16 (- 17), (20,) 21 - 23, 
29 - 31, June 1, (10 - 12)  
 
Remark: 
- Parenthesis means lower probability of activity enhancement. 
 
F. K. Janda, OK1HH 
(from Czech Propagation Interested Group 
compiling this geomagnetic activity weekly forecasts since January 1978). 
e-mail: ok1hh(at)rsys.cz

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