Weekly Bulletin on Solar and Geomagnetic Activity
               Highlights on  16 - 22.12.2019,
                 Forecast on 22 - 30.12.2019,
           Carrington Rotation 2225 (10,05.12.2019)   
             Earth out of ecliptic (1.8 - 1.0) deg. 
            (S25 - N25 is zone of geoeffectiveness)

 THE SUNSPOT-FORMING SOLAR ACTIVITY REMAINED VERY LOW WITH A SPOT-
LESS VISIBLE DISK (277 SPOTLESS DAYS IN THE YEAR - 77%). ESTIMATED,  
MOST LIKELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN 
THE INTERNATIONAL SYSTEM (old) FOR PERIOD W=0 (Wn=0). 

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

FLARE ACTIVITY WAS AT THE VERY LOW LEVEL. NO SOLAR FILAMENT EJEC-
TION AND CORONAL MASS EJECTION 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 × 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
CH +  N38L273 N25L256 N11L271 N20L256 <5.0% 16.12  7  G0  SDO, SOHO...
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 5.12/1730 UT, THE SIGN OF SECTOR IMF IS EXPECTED UNSTABLE AND CHAN-
GES FREQUENTLY, BUT IN THE MIDDLE IT REMAINS WITH THE "-". IN THE FOLLOW-
ING WEEK THE BEHAVIOR OF THE SECTOR SIGN NOT CHANGED, BUT TO GIVE A FORE-
CAST BY EARTH'S PASSAGE OF CONFIDENT SECTOR BOUNDARY IS NOT POSSIBLE (DE-
EP PHASE OF MINIMUM!).

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DECEMBER 16     17     18     19     20     21     22   DECEMBER
Wus     000    000    000    000    000    000    000
F10.7   070    071    070    070    070    071    071 
èbcg  A<1.0  A<1.0  A<1.0  A<1.0  A<1.0  A<1.0  A<1.0   GOES
Sp      000    000    000    000    000    000    000   msh   
N                                                 
IMF      -      ~      -      +      +     -/~    -/~   DSCOVR   
Å>2  2.0E+6 2.5E+6 3.8E+6 7.7E+6 1.2E+7 1.4E+7 1.5E+7   GOES
Ie>2                                615                 pfu 
Ap       2      2      11     13     5      5      2    nô  
Dst                                                     nô KIOTO
Amsc     4      3      17     10     8      5      4    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 HAVE 
NOT BEEN OBSERVED. 
 
NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS 
ORBIT IS NOT EXPECTED.

 THE GEOMAGNETIC CONDITION AT MIDDLE LATITUDES REMAINS UNSETTLED  AND 
QUIET ALL DAYS, BUT 18-19.09 TWO 6 HOURS SUBSTORMS (G0) ON THE CENTER 
DATA OF THE BOULDER AND ONLY ONE SUBSTORM (G1) ~3 HOURS DURATION AT 
18.09 ON THE IZMIRAN DATA HAVE BEEN RECORDED.

NEXT WEEK THE MOST PROBABLY QUIET AND UNSETTLED GEOMAGNETIC CONDITION 
IS EXPECTED.


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