Weekly Bulletin on Solar and Geomagnetic Activity
                  Highlights on 13 - 19.04.2020,
                   Forecast on 20 - 27.04.2020,
   Carrington Rotations 2229, 2230 (28,37.03; 24,65.04.2020)   
             Earth out of ecliptic (-5.7 - -5.4) deg. 
            (S35 - N20 is zone of geoeffectiveness)

 THE SUNSPOT-FORMING SOLAR ACTIVITY REMAINED VERY LOW. SPOT-
LESS VISIBLE DISK HAVE BEEN OBSERVED ALL PERIOD (85 SPOTLESS 
DAYS IN THE 2020). ESTIMATED, MOST LIKELY WEEKLY AVERAGE VA-
LUE OF THE RELATIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYS-
TEM (old) FOR PERIOD W = 0 (Wn= 0). 

NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY WAS ON VERY LOW LEVEL.
LIKELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN 
THE INTERNATIONAL SYSTEM (old) FOR NEXT WEEK IS W=010+10/-10. 

 FLARE ACTIVITY WAS AT THE VERY LOW LEVEL, BUT 2 SOLAR FLARE OF 
A CLASSES (18, 19.04)  AND THREE CORONAL MASS EJECTIONS (13 - 
16.04) WAS OBSERVED OF THE PERIOD.
 
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FLARES >M1 X-RAY CLASSES
        to   tm    te   local.    Class   E(1-8A)  AR   RII/IV CME
                                X-ray/Ïp   J/m-2
DSF     to      te  localization   l × ÇÒÁÄ.  Fl    AR    CME/to
--------------------------------------------------------------------

NEXT WEEK THE FLARE ACTIVITY IS EXPECTED AT VERY LOW LEVEL.

ON THE VISIBLE SOLAR DISK THE FOLLOWING CORONAL HOLES WERE OBSERVED:
---------------------------------------------------------------------
 sign  N end   E end   S end   W end   Sch    EE    R  G  Spacecraft
* - low geoeffectivity, the substorms with duration <6 h. only.
Sch - CH area in % solar hemisphere near the central meridian on 
https://www.solarmonitor.org/; n/d - no data; R - solar rotations; 
EE-date of possible geomagnetic disturbance in the Earth's environment. 
G(0-5)-geoeffectivity in last solar rotation on the middle latitudes. 
A-active geomagnetic condition. 
----------------------------------------------------------------------

AFTER 12.03/20 UT THE IMF SECTOR SIGN  WAS "-". NEXT WEEK THE BEHAVIOR 
OF THE SECTOR STRUCTURE SIGN WILL NOT CHANGE.  THE REAL PROVISION OF 
THE NEXT SECTOR BOUNDARY IS NOT IMPOSSIBLE, MAY BE BECAUSE OF THE CON-
DITIONS OF A DEEP MINIMUM (TOPIC FOR STUDY!!!).
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áðòåìø   13     14     15     16     17     18     19   áðòåìø
Wus     000    000    000    000    000    000    000
F10.7   070    069    068    069    068    070    069    
èbcg  >A1.0  <A1.0  <A1.0   A1.0  <A1.0  <A1.0  <A1.0   GOES
Sp     000     000    000    000    000    000    000   msh   
N                                              
IMF      -      -      -      -      -      -      -    DSCOVR   
Å>2  1.7E+6 1.7å+6 1.2E+6 1.4E+6 1.6E+6 1.4E+6 1.7å+6   GOES
Ie>2    158    168    208    193    194    134    160   pfu 
Ap       5      8      7      5      4      4      2    nô  
Dst                                                     nô KIOTO
Amsc     6      6      6      5      4      3      2    nô IZMIRAN 
-------------------------------------------------------------------------            
Å>2 - Daily Electron Fluency e/(cm2-ster-day) with E>2 MeV.
Ie>2 - the maximum intensity of electron flux in geostationary or-
bits in days according to GOES-15 in (electrons/cm2.s.sr) for events
> 1000 pfu.

 THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT NOT 
OBSERVED. 
 
NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS OR-
BIT IS NOT EXPECTED.

 THE GEOMAGNETIC CONDITION REMAINED QUITE AND UNSETTLED.  

NEXT WEEK THE MOST PROBABLY QUIET AND UNSETTLED GEOMAGNETIC CONDI-
TION WILL OBSERVED.


HIGHLIGHT AND FORECAST COMPOSED FROM DATA:
NOAA SWPC, BOULDER, USA               http://www.swpc.noaa.gov,
THE SOLAR INFLUENCES DATA ANALYSIS CENTRE, 
SIDC, BRUSSELS, BELGIUM               http://sidc.oma.be/index.php3, 
THE IZMIRAN, MOSCOW, TROITSK, RUSSIA  http://www.izmiran.ru
                                                          V. Ishkov