Weekly Bulletin on Solar and Geomagnetic Activity
                  Highlights on 12 - 18.10.2020,
                    Forecast on 19 - 261.10.2020,
               Carrington Rotation 2236(05,01.10.2020)   
                Earth out of ecliptic (6.4 - 6.0) deg. 
               (S20 - N35 is zone of geoeffectiveness)

THE SUNSPOT-FORMING SOLAR ACTIVITY REMAINED ON VERY LOW LEVEL 
THE VISIBLE SOLAR DISK  WAS SPOTLESS 13 - 14.10 (204 SPOTLESS 
DAYS AT 2020). ESTIMATED, MOST LIKELY WEEKLY AVERAGE VALUE OF 
THE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR PERI-
OD W =7+10/-7 (Wn=12+16/-12). ON VISIBLE SOLAR DISK TWO SMALL 
SUNSPOT GROUPS OF CURRENT 25 SOLAR CYCLE.

 NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY WAS ON VERY LOW LEVEL.
VISIBLE SOLAR DISK WITH HIGH PROBABILITY WILL BE SPOTLESS. LI-
KELY 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 LOW AND VERY LOW LEVEL. 2 SOLAR FLARE OF 
 LOW X-RAY CLASS "C", 29 - CLASS "B", 48 - CLASS "A". ONE SOLAR 
 FILAMENT EJECTA AND 9 CORONAL MASS EJE TIONS 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
16.10 >1413  >0545   N23E62L264    10  
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NEXT WEEK THE FLARE ACTIVITY IS EXPECTED AT VERY LOW LEVEL.

ON THE VISIBLE SOLAR DISK THE FOLLOWING CORONAL HOLES WERE OBSERVED:
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  sign  N end    E end      S end      W end     Sch   EE   R G Sp/craft
óî -  S20E02L190 S35E11L199 S38E02L190 S22W12L176 4.3 20.10 1   SOHO...
* - 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. 
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 FROM 18.10/2030 UT, THE EARTH IS IN THE "+" SECTOR OF THE INTERPLANE-
TARY MAGNETIC FIELD. THE FOLLOWING THE NEXT SECTOR BOUNDARY "+/-" IT 
CAN EXPECT 3.11.
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OCTOBER  12     13     14     15     16     17     18   OCTOBER
Wus     015    000    000    014    014    015    028
F10.7   074    072    075    074    075    073    076
èbcg   A1.2   A1.5   A2.6   A2.3   A2.4   A2.3   A3.4   GOES
Sp      030    000    010    030    060    080    110   msh   
N                      1                           1 
IMF      -      -      -      -      -      -     -/+   DSCOVR   
Å>2  4.5E+6 1.8å+6 2.2E+6 2.0E+6 3.1E+6 5.4E+6 4.8å+6   GOES
Ie>2    633    346    215    210    196    321    211   pfu 
Ap       4      3      0      3      4      5      3    nô  
Dst                                                     nô KIOTO
Amsc     5      3      1      2      4      5      4    nô IZMIRAN 
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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 NO 
OBSERVED.  
 
NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS 
ORBIT IS NOT EXPECTED.

 ALL DAYS THE GEOMAGNETIC CONDITION REMAINED QUIET.

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