Weekly Bulletin on Solar and Geomagnetic Activity
                  Highlights on 07 - 13.12.2020,
                    Forecast on 14 - 21.12.2020,
               Carrington Rotation 2238(25,94.12.2020)   
                Earth out of ecliptic (1.3 - 0.8) deg. 
               (S30 - N30 is zone of geoeffectiveness)

 THE SUNSPOT-FORMING SOLAR ACTIVITY REMAINED ON LOW LEVEL. ES-
TIMATED,  MOST LIKELY WEEKLY AVERAGE VALUE OF THE SUNSPOT NUM-
BER IN THE INTERNATIONAL SYSTEM (old) FOR PERIOD W = 10+11/-4 
(Wn= 17+18/-6). ON THE VISIBLE DISK OF THE SUN  TWO SMALL SUN-
SPOT GROUPS HAVE BEEN OBSERVED. 

 NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY WAS LOW AND VERY LOW LE-
VELS. WITH HIGH PROBABILITY AFTER 15.12, THE VISIBLE DISC OF THE 
SUN WILL BE SPOTLESS. 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 MIDDLE, LOW  AND VERY LOW LEVELS. 1 SOLAR 
FLARE OF LOW X-RAY CLASS "C", 47 -CLASS "B", ONE SOLAR FILAMENT  
EJECTA (in structure of flare C7.4) AND 8 CORONAL MASS EJECTIONS 
(7. 9, 11, 12, 13.12) HAVE BEEN OBSERVED.
-------------------------------------------------------------------
FLARES >M1 X-RAY CLASSES
        to   tm    te   local.   Class  E(1-8A) AR  RII/IV   CME
                                X-ray/Ïp J/m-2
07.12 1546 1632 1715 S25W08L253   C7.4    ?   12790 DSF II CME/1636                    

DSF     to     te  localization   l deg.  Fl    AR       CME/to
--------------------------------------------------------------------
NEXT WEEK THE FLARE ACTIVITY IS EXPECTED AT VERY LOW AND 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. 
----------------------------------------------------------------------

 FROM 08.12/11 UT, THE EARTH IS IN THE "-" SECTOR OF THE INTERPLANETA-
RY MAGNETIC FIELD. THE FOLLOWING THE NEXT SECTOR BOUNDARY "-/+" IT CAN 
BE EXPECT 15.12.
---------------------------------------------------------------------- 
DECEMBER 07     08     09     10     11     12     13   DECEMBER
Wus     035    011    011    011    011    024    014
F10.7   090    082    082    082    083    082    081
èbcg   ÷2.1   ÷6.9   á4.0   á5.1   á6.7   á6.9   á6.6   GOES
Sp      060    070    050    080    060    030    010   msh   
N                                           1        
IMF      +     +/-     -      -      -      -      -    DSCOVR   
Å>2  1.7E+7 1.4å+7 7.9E+6 3.2E+6 3.2E+6 6.1E+6 5.0å+6   GOES
Ie>2    664    496    558    182    203    286    320   pfu 
Ap       3      5      7      8      7      4      5    nô  
Dst                                                     nô KIOTO
Amsc     2      4      8      7      8      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 ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT NOT 
OBSERVED.  
 
NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS 
ORBIT IS NOT EXPECTED.

ALL DAYS THERE ARE UNSETTLED AND QUITE GEOMAGNETIC CONDITION HAVE 
BEEN OBSERVED. 

NEXT WEEK THE MOST PROBABLY QUIET AND UNSETTLED GEOMAGNETIC CON-
DITION WILL BE 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