-------------------------------------------------------------------
THE RELATIVE MONTHLY MEAN SUNSPOT NUMBER ON MAY 2021 HAS MADE 
              Wmay. = 14.7         24.5(in new system)  
THAT GIVES FOR 11 MONTH (2020, NOVEMBER) OF DEVELOPMENT CURRENT 25 SOLAR 
CYCLE THE SMOOTHED MONTHLY MEAN SUNSPOT NUMBER 
              W*nov. = 8.2         13.6 -  × ÎÏ×ÏÊ ÓÉÓÔÅÍÅ
              W*oct. = 7.1         11.9 - × ÎÏ×ÏÊ ÓÉÓÔÅÍÅ
 On July 1, 2015 Centre in Brussels moved to a new system of calcu-
lation the relative number of sunspots and practically all of the 
values were replaced throughout the numbered series of Wolf numbers 
(see link). While there is addictive, I recalculated (0.6) to the 
old system, but only W*, and present below the new values for the 
minimum and maximum of 25 cycles SA. 

THE BEGINNING OF 25 SOLAR CYCLE  -  I 2020  with W*=1.3; (1.8n)  
MAXIMUM OF THE CURRENT 25 CYCLE  - VI 2024 - Wmax =90-100; (150n)
THE END OF 25 SOLAR CYCLE (THE POINT OF MINIMUM) -  I - VI 2031;

Provisional daily International Sunspot Numbers for May 2021 
(71 observatories): 
 1.. 10    6..  0   11.. 32   16.. 13   21.. 14   26.. 41   31.. 29
 2..  0    7.. 10   12.. 33   17.. 14   22.. 19   27.. 42í
 3..  0    8.. 16   13.. 30   18.. 28   23.. 27   28.. 30
 4..  0    9.. 20   14.. 26   19.. 27   24.. 31   29.. 14
 5..  0   10.. 33   15.. 28   20.. 20   25.. 41   30.. 28
  Minimum : 0 on 2 - 6.05
[The daily value W in old system close to true (in a minimum phase) 
can be received, multiplying by k = 0.6].
 
THE MONTHLY MEAN OF OBSERVED RADIO FLUX OF THE 10 cm (2800 MHz) ON 
MAY 2021, AND SMOOTHES ON 2020, NOVEMBER
               F10.7may = 75.6           F*10.7nov.= 75.7 

THE MONTHLY MEAN OF GEOMAGNETIC Ap-index ON MAY 2021, 
AND SMOOTHES ON 2021, NOVEMBER 2020
               Ap may= 6.5               Ap*oct. = xxx
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       Weekly Bulletin on Solar and Geomagnetic Activity
                  Highlights on 31.05 - 06.06.2021,
                   Forecast on 07 - 14.06.2021,
    Carrington Rotation 2244, 2245 (11,48.05; 07,69.06.2021)   
             Earth out of ecliptic (-2.5 - -2.0) deg. 
             (S32 - N32 is zone of geoeffectiveness)

THE SUNSPOT-FORMING SOLAR ACTIVITY REMAINED ON LOW LEVEL. THE 
ESTIMATED MOST LIKELY WEEKLY AVERAGE VALUE OF THE SUNSPOT NUM-
BER IN THE INTERNATIONAL SYSTEM (old) FOR PERIOD IS W=18+7/-6 
(Wn = 30+12/-10).  ON THE VISIBLE SOLAR DISK  3 SMALL SUNSPOT 
GROUPS WERE 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+10/-10. 

 FLARE ACTIVITY WAS AT LOW LEVELS. 1 SOLAR FLARE OF X-RAY "C"
CLASS, 54 -"B" AND 6 CORONAL MASS EJECTIONS (2-3, 5-6.06) WAS 
OBSERVED AT THE PERIOD. 
-------------------------------------------------------------------
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
--------------------------------------------------------------------
NEXT WEEK THE FLARE ACTIVITY IS EXPECTED AT LOW AND 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  Sp/craft 
* - 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 2.06/2220 UT THE EARTH IS IN THE "+" SECTOR OF THE INTERPLANE-
TARY MAGNETIC FIELD. ON PERIOD 1/04-2/2220 UT THE SIGN OF THE SECTOR 
WAS "-". FOLLOWING SECTOR BOUNDARY "+/-" IT CAN BE EXPECT 09.06.
---------------------------------------------------------------------- 
MAY      31     01     02     03     04     05     06   éàîø
Wus     031    020    030    028    030    030    042
F10.7   082    075    076    076    077    074    077    
èbcg   á6.7   á5.5   ÷5.4   á5.3   á6.6   á4.8   á5.8   GOES
Sp      120    100    080    080    070    150    200   msh   
N                      1                           1    
IMF      -     -/+    +/-      -      -      -      -    DSCOVR   
Å>2  2.3å+6 2.5E+6 2.3å+6 1.8E+6 1.3E+6 1.3E+6 1.1å+6   GOES
Ie>2    176    158    211    157    143    145    151   pfu
Ap       3      3      5      6      5      4      5    nô  
Dst                                                     nô KIOTO
Amsc     3      6      7      5      4      4      5    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 NOT OBSERVED. 
 
NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS 
ORBIT IS NOT EXPECTED.

 THE GEOMAGNETIC CONDITION  REMAINED QUIET  AND UNSETTLED.

IN THE NEXT WEEK THE MOST PROBABLE IS EXPECTED A QUITE AND UN-
SETTLED GEOMAGNETIC CONDITION.

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