Weekly Bulletin on Solar and Geomagnetic Activity
                  Highlights on 16 - 22.08.2021,
                   Forecast on 23 - 30.08.2021 
     Carrington Rotation 2247, 2248 (1,1.08, 28,33.08.2021)   
              Earth out of ecliptic (3.9 - 4.3) deg. 
              (S30 - N32 is zone of geoeffectiveness)

THE SUNSPOT-FORMING SOLAR ACTIVITY WAS ON VERY LOW AND LOW LE-
VELS.  THE ESTIMATED  MOST LIKELY WEEKLY AVERAGE VALUE OF THE 
SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR PERIOD IS 
W= 11+4/-3 (Wn= 18+7/-5). 3 SMALL QUITE SUNSPOT GROUPS ON THE 
VISIBLE SOLAR DISK, ALL ON NORTH HEMISPHERE HAS BEEN OBSERVED.
  
 NEXT WEEK SUNSPOT ACTIVITY WILL BE ON VERY LOW AND LOW LEVEL. 
WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN THE IN-
TERNATIONAL SYSTEM (old) FOR NEXT WEEK IS W=020+20/-10. 

FLARE ACTIVITY WAS AT LOW AND VERY LOW AND LOW LEVELS. 9 FLARE 
OF X-RAY CLASS "C", 55 -CLASS "B", TWO SOLAR FILAMENT EJECTION 
AND 6 CORONAL MASS EJECTIONS (16-22.08) HAVE BEEN OBSERVED. 
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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 deg.  Fl    AR    CME/to
17.08 <1926   >1135   S30E85L221    >15  A9.1        CME/1112
22.08      0300       S71E14L091    >25              CME/0336
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NEXT WEEK THE FLARE ACTIVITY IS EXPECTED AT VERY LOW AND LOW LEVELS.

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 13.08/06 UT THE EARTH IS IN THE "+" SECTOR OF THE INTERPLANETA-
RY MAGNETIC FIELD. FOLLOWING SECTOR BOUNDARY "+/-"  IT CAN BE EXPECT 
27.08.
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AUGUST   16     17     18     19     20     21     22   á÷çõóô
Wus     014    013    016    025    014    025    016
F10.7   077    073    075    075    078    077    077    
èbcg   á4.8   á3.9   á3.7   á3.6   B1.1   B1.1   ÷1.2   GOES
Sp      030    010    020    040    010    090    140   msh   
N                      1             1                    
IMF      +      +      +      +      +      +      +    DSCOVR   
Å>2  5.6å+6 1.7å+7 1.6å+7 1.6E+7 1.4E+6 1.0E+6 1.3å+6   GOES
Ie>2    438    618    490    448    145    154    167   pfu
Ap       7      5      6      5      5      4      3    nô  
Dst                                                     nô KIOTO
Amsc     8      6      6      4      8      4      3    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 RECURRENT ELECTRON FLUX AT GEOSYNCHRONOUS 
ORBIT NO OBSERVED.
 
NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS 
ORBIT IS NOT EXPECTED - NO GEOEFFECTIVE CORONAL HOLES.

 THE GEOMAGNETIC CONDITION WAS QUIET AND UNSETTLED IN THE PERIOD. 
 
THE NEXT WEEK IS MOST PROBABLE A QUIET AND UNSETTLED GEOMAGNETIC 
CONDITION ALL DAYS.

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