Weekly Bulletin on Solar and Geomagnetic Activity
                 Highlights on 3 - 9.04.2017,
                 Forecast on 10 - 17.04.2017,
            Carrington Rotation 2189 (2,37.04.2017)
           Earth above the ecliptic (-6.4, -6,0) deg. 
               (S30-N25 is geoeffectiveness zone)

 SUNSPOT-FORMING ACTIVITY WAS ON A HIGH (3.04), THE MIDDLE (4 -6.04),
THE LOW - 7, THE VERY LOW - 9.04 LEVELS AND 8.04 WAS SPOTLESS DAY (27 
ON THIS YEAR). THE ESTIMATED,  MOST LIKELY  WEEKLY AVERAGE VALUE  OF 
THE RELATIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR THE
THE PERIOD IS W=25+33/-25 (Wn= 39+54/-39). ON THE VISIBLE DISC OF THE 
SUN 4 -0 SUNSPOT GROUP, ONE WAS A BIG SIZE AND QUITE AR12645 (S08L012, 
Sp max=600 msh) HAVE BEEN OBSERVED. THE AR HAD MOSTLY TRANSITED AROUND 
THE W-limb AT 7.04 WITH ONLY THE TRAILING SPOTS VISIBLE FROM THIS LAR-
GE ELONGATED AR. 

NEXT WEEK SUNSPOT-FORMING ACTIVITY IS EXPECTED AT THE LOW  LEVEL. 
THE ESTIMATED, MOST LIKELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUN-
SPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR THE NEXT WEEK IS W=
30+10/-30.

FLARE ACTIVITY WAS AT THE LARGE LEVEL 03.04 AND THE LOW IN OTHER DAYS.
ONE SOLAR FILAMENT EJECTION OCCURRENCES THROUGH THE PERIOD. ACCORDING 
TO THE SOHO AND STEREO CORONOGRAPHS DATA > 10 CMEs HAVE BEEN OBSERVED.
----------------------------------------------------------------------
FLARES to   tm    te   local.     Class   E(1-8A)  AR   RII/IV   CME
                                 X-ray/Ïp  J/m-2
03.04 0056 0105 >0112 N15W75L054 M1.2/SF 8.2E-03 12644
03.04 1415 1429  1454 N19W80L054 2N/M5.8 3.1E-02 12644 II/2 IV/1 CME

DSF     to     te    ËÏÏÒÄÉÎÁÔÙ  l × ÇÒÁÄ. Fl     Aï        CME/to
03.04 >0101  >1315   N29W32L023      4
----------------------------------------------------------------------
NEXT WEEK FLARE ACTIVITY IS EXPECTED AT A LOW AND VERY LOW LEVELS. 

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  +  N38L298 N25L293  N08L303 N30L308       10.04  >9      SDO, SOHO..
CH  +  N05L317 N03L312  S02L320 N02L323       03.04   1      SDO, SOHO..
Both CH, perhaps, parts of one CH.
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.
------------------------------------------------------------------------

FROM 26.03/2130 UT THE EARTH IS IN "-" SECTOR OF THE INTERPLANETARY MAG-
NETIC FIELD. 3-4 AND 8-9.04  THE SIGN OF SECTOR  HAVE BEEN CHANGED. THE 
FOLLOWING SECTOR BOUNDARY -/+  THE EARTH HAS EXPECTED TO PASS 10.04.

APRIL    03     04     05     06     07     08     09     APRIL
Wus     097    075    037    038    027    000    013 
F10.7   108    094    085    076    074    073    074 
èbcg   ó1.2   ÷5.5   ÷2.7   ÷1.6   á9.4   ÷1.0   á7.2     GOES
Sp     1270    890    550    400    070    000    020  msh   
N        1                                         1  
IMF      ~      ~      -      -      -      ~      ~      DSCOVR   
Å>2  1.9å+9 8.6å+7 5.7E+6 6.0E+6 7.8E+6 1.2å+7 8.3å+7     GOES
Ie>2  53552  18021    210    241    224    491   3029  pfu 
Ap       3      19     10     7      10     16     18  nô BOULDER 
Dst                                                    nô KIOTO 
Amsc     8      15     11     12      9     11     11  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 WAS BE-
GINING AT 22.03/1530 UT AND OBSERVED 22.03-04.04. NEXT INCREASE WAS
BEGINING AT 09.04/1330 UT.   

THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSTATIONARY ORBIT OF VERY 
HIGH LEVEL IS EXPECTED 10 - 12.04.

MINOR STORM CONDITION (G1, Ams=31, dur.=12 h.) OBSERVED ONLY IN BOUL-
DER CENTER 8 - 9.04 AND 4.04 IN BOULDER CENTER OBSERVED SUBSTORM (G1, 
dur.= 9 h.). IN OTHER DAYS THE GEOMAGNETIC CONDITION WAS UNSETTLED.

NEXT WEEK GEOMAGNETIC CONDITION WILL BE QUIET AND UNSETTLED.

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