Weekly Bulletin on Solar and Geomagnetic Activity
                  Highlights on 07 - 13.09.2020,
                    Forecast on 14 - 21.09.2020,
   Carrington Rotation 2234, 2235(11,49.08; 07,74.09.2020)   
                Earth out of ecliptic (4.9 - 5.5) deg. 
                (S20 - N35 is zone of geoeffectiveness)

 THE SUNSPOT-FORMING SOLAR ACTIVITY REMAINED ON VERY LOW LEVEL 
BAT SPOTLESS VISIBLE DISK WAS JUST 23  AND 25.09 (192 SPOTLESS 
DAYS AT 2020). ESTIMATED, MOST LIKELY WEEKLY AVERAGE VALUE OF 
THE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR PERI-
OD  W=2+6/-2 (Wn=4+9/-4). ON THE VISIBLE SOLAR DISK, ONE SMALL 
ACTIVE REGION 25 CYCLE, SUNSPOTS IN WHICH ODSERVED ONLY 25 AND 
27.09.

 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 VERY LOW LEVEL. ONE SOLAR FLARE OF LOW 
 X-RAY CLASS "C", 24 - CLASS "B" AND 19 - CLASS "A" 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
--------------------------------------------------------------------

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 Spacecraft
CH  +    Pn    N25E10L119 N10W10L099 N20E20L089 18.2% 28.09 3 A ACE...
* - 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 22.09/09 UT, THE EARTH IS IN THE "+" SECTOR OF THE INTERPLANE-
TARY MAGNETIC FIELD. THE FOLLOWING THE NEXT SECTOR BOUNDARY "+/-" IT 
CAN EXPECT 6.10.
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SEPTEMBER 21     22     23     24     25     26     27   óåîôñâòø
Wus      000    000    013    000    011    000    000
F10.7    071    072    073    074    073    073    074
èbcg    A4.8   A4.0   A4.4   A3.9   A3.8   A2.8   A2.8   GOES
Sp       000    000    010    000    010    000    000   msh   
N                       1             1              
IMF       -     -/+     +      +      +      +      +    DSCOVR   
Å>2   2.0E+6 1.2å+6 1.9E+6 3.6E+7 1.7E+8 3.6E+7 5.2å+7   GOES
Ie>2     177    152    166   1232   6990   3802 16736    pfu 
Ap        3      6      11     19     20     27    24    nô  
Dst      -26    -45    -53    -57    73     -74   -71    nô KIOTO
Amsc      4      5      12     17     20     15    19    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 
BEGUN AT 24.09/1540 UT AND OBSERVED AT 24.08-27.09. 
 
NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS OR-
BIT IS EXPECTED 28.09-4.10.

 THE GEOMAGNETIC CONDITION HAS BEEN DISTURBED FROM 24.09, WHEN A 9 h. 
SUBSTORM WITH INTENSITY (G1)  WAS MARKED ACCORDING TO THE DATA OF THE  
CENTERS IN BOULDER  AND IZMIRAN.  25.09  IN THE FIRST HALF OF THE DAY
ACCORDING TO THE CENTER IN BOULDER DATA NOTED AGAIN THE SAME SUBSTORM,
AND ACCORDING IZMIRAN DATA AT THE END OF THE DAY REGISTERED MINOR MAG-
NETIC STORM (G1, Amsc= 3 nT, dur.=12 h.). 26.09 THE CENTER IN BOULDER
IN THE FIRST HALF OF THE DAY  ALSO  REGISTERED A MINOR MAGNETIC STORM 
WITH THE SAME PARAMETERS. A MODERATE MAGNETIC STORM (G2) BEGAN AT THE 
END OF DAY 27.09  AND IS STILL CONTINUING.  THESE DISTURBANCES OF THE 
GEOMAGNETIC FIELD  WERE CAUSED BY 16.09  SOLAR FILAMENT EJECTION WITH 
VERY SLOW CORONAL MASS EJECTION AND HIGH-VELOCITY STREAM OF SOLAR WIND 
FROM THE LOW LAW-LATITUDE PART OF THE NORTHERN POLAR CORONAL HOLE "+" 
POLARITY. IN OTHER DAYS THE GEOMAGNETIC CONDITION REMAINED QUIET.

 NEXT WEEK THE MOST PROBABLY QUIET AND UNSETTLED GEOMAGNETIC CONDI-
TION WILL OBSERVED ALL DAYS EXEPT 28-29.09. 

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