Weekly Bulletin on Solar and Geomagnetic Activity
                Highlights on 21 - 27.08.2017,
                 Forecast on 28.08 - 04.09.2017,
            Carrington Rotation 2194 (16,48.08.2017)
           Earth above the ecliptic (3,3; 4,0) deg. 
              (S25 - N30 is geoeffectiveness zone)

SUNSPOT-FORMING ACTIVITY WAS ON THE MIDDLE LEVEL, AND 27.08 DOWN TO 
THE VERY LOW LEVEL ONLY. THE ESTIMATED,  MOST LIKELY WEEKLY AVERAGE 
VALUE  OF THE RELATIVE SUNSPOT NUMBER  IN  THE INTERNATIONAL SYSTEM 
(old) FOR THE PERIOD W=023+6/-10 (Wn= 037+9/-16). ON THE VISIBLE SO-
LAR DISK 2 SMALL SUNSPOT GROUP. 

 NEXT WEEK THE LEVEL OF SUNSPOT-FORMING ACTIVITY IS REMAINED AT A LOW
LEVEL. MOST LIKELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER 
IN THE INTERNATIONAL SYSTEM (old) FOR THE NEXT WEEK IS W= 020+20/-10.  

FLARE ACTIVITY WAS AT A VERY LOW ALL DAYS. SOLAR FILAMENT EJECTIONS 
NOT OCCURRENCES THROUGH THE PERIOD. ACCORDING TO THE DATA FROM SOHO 
AND STEREO CORONOGRAPHS >5 CME HAVE BEEN OBSERVED.
----------------------------------------------------------------------
FLARES to   tm    te   local.     Class   E(1-8A)  AR   RII/IV   CME
                                 X-ray/Ïp  J/m-2
DSF     to      te    ËÏÏÒÄÉÎÁÔÙ    l × ÇÒÁÄ.  Fl    Aï    CME/to
---------------------------------------------------------------------

NEXT WEEK THE FLARE ACTIVITY IS EXPECTED ON THE 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  Space Obser.
CH  +  N50L008 N30L318  N17L023 N22L040       16.08  4     SDO, SOHO...
Sch - CH Square in Mm**2 (in square megameters) near the central meri-
dian on http://sdowww.lmsal.com/suntoday/; n/d - no data;
R - solar rotations; EE-date of possible geomag. disturbance in the 
Earth's environment. G(0-5)-geoeffectivity in last solar rotation on
the middle latitudes. A-active geomagnetic condition.
------------------------------------------------------------------------

 16.08/02 UT THE EARTH IS IN "+" SECTOR OF THE INTERPLANETARY MAGNE-
TIC FIELD. NEXT SECTOR BOUNDARY +/- EARTH SHOULD BE PASSED 0N 28.08.

AUGUST  21     22     23     24     25     26     27      AUGUST
Wus    043    048    040    043    039    035    022 
F10.7  087    090    085    079    081    078    078
èbcg  ÷2.6   ÷1.7   ÷1.1   B1.2   ÷1.2   ÷3.1   ÷1.1      GOES
Sp     590    520    460    440    280    250    150  msh   
N                                                  
IMF     ~      ~      +      +      +      +      ~       DSCOVR   
Å>2 2.1å+9 2.3å+8 7.9E+7 9.1å+7 2.9å+8 4.4å+8 3.8å+8      GOES
Ie>2 52010  31128   3710   3701   7706  10279   8019   pfu 
Ap      11     25     28     11     5      4      11   nô  
Dst                                                    nô KIOTO
Amsc    11     17     30     10     7      5      12   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 GOES15 in (electrons/cm2.s.sr) for events
> 1000 pfu.

 THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT HAS BE-
GIN 18.08/1650 UT AND 18 - 27.08 WAS OBSERVED. 

THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSTATIONARY ORBIT OF VERY 
HIGH LEVEL IS EXPECTED 28 - 31.08.

 MINOR MAGNETIC STORM (G1, Ams=32, dur.= 18 Þ.). HAS REGISTERED BOUL-
DER CENTER DATA 23.08 WHEREAS ACCORDING IZMIRAN DATA THE SUBSTORM OF
G2-INTENSITY AND <9 h. DURATION  IS NOTED AT SECOND HALF OF THIS DAY. 
AT THE BTGINNING OF DAY 22.08 IS REGISTERED INTENSIVE (G2 BY BOULDER 
- VERY SELDOM!!) SUBSTORM DURATION <6 h. BY THE IZMIRAN DATA THIS SUB-
STORM HAD G0 INTENSITY. THE MINOR MAGNETIC STORM IS CONNECTED WITH AR-
RIVAL TO EARTH THE DISTURBANCE FROM C7/SF FLARE C7/SF 19.08 WHICH WAS 
FOLLOWED BY RADIO BURST OF II TYPE AND CME. THE SUBSTORM SOURCE AT THE 
BEGINNING OF DAY 22.08  ISN'T CLEAR FOR ME.  IN OTHER DAYS GEOMAGNETIC 
CONDITION WERE UNSETTLED AND QUIET.

NEXT WEEK THE GEOMAGNETIC CONDITION WILL BE UNSETTLED AND QUIET TO 30- 
31.08 WHEN THE EARTH PASSES THE RECURRENT HIGH-SPEED STREAM OF THE SO-
LAR WIND FROM FAMILLY OF CORONAL HOLES NORTHERN POLAR HOLE.

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