Weekly Bulletin on Solar and Geomagnetic Activity
                Highlights on 13 - 19.04.2015,
                 Forecast on 20 - 27.04.2015,
   Carrington Rotationù 2162, 2163 (27,93.03; 24,21.04.2015)

 SUNSPOT-FORMING ACTIVITY OF THE SUN  WAS AT THE AVERAGE LEVEL ALL
DAYS. ESTIMATED, WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUM-
BER IN THE INTERNATIONAL SYSTEM WAS MADE W=050+35/-19. ON THE VI-
SIBLE DISK OF THE SUN CONSTANTLY OBSERVED 4-7 SUNSPOT GROUPS, ONE 
OF WHICH WAS LARGE SIZE (AR12321) AND ONE - MIDDLE SIZE (AR11324). 

 SUNSPOT-FORMING ACTIVITY  IS EXPECTED TO BE  AT AVERAGE TO LOW LE-
VELS. ESTIMATED,  MOST LIKELY WEEKLY AVERAGE VALUE OF RELATIVE SUN- 
SPOT NUMBER  IN THE INTERNATIONAL SYSTEM  FOR THE NEXT WEEK  IS EX-
PECTED W = 030+20/-10.

FLARE ACTIVITY WAS AT A LOW LEVEL ALL DAYS, EXCEPT 14.04 - ON VERY 
LOW. FOUR SOLAR FILAMENT EJECTIONS  OCCURRENCES THROUGH THE PERIOD. 
BY DATA OF CORONOGRAPHS SOHO AND STEREO WERE OBSERVED > 32 CME FROM 
WHICH TWO WERE "HALO" TYPE, ONE - "PARTIAL HALO III" TYPE AND TWO - 
"PARTIAL HALO II" TYPE.
 
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FLARES   to   tm   te    c/p local.Class    E(1-8A)  AR RII/IV CME
                                   X-ray/Ïp  J/m-2
DSF     to      te    c/p local.     l in deg.  Fl    AR     CME
16.04  0450    0833  S51W43L139      29       
16.04 >1648   <0646  S26E66L030      13
18.04 >0113   <1310  N08W82L151      21 
18.04  1340    1400  N08W15L085       7      1F/C5.2 12321       CME
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NEXT WEEK FLARE ACTIVITY IS EXPECTED AT THE LOW LEVEL. 

ON THE VISIBLE SOLAR DISK THE FOLLOWING CORONAL HOLES WERE OBSERVED:
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  sign  N end   Å end   S end   W end     EE   R  G   Observatories
CH   -  S12L074 S15L062 S25L078 S20L084  20.04    2  G1  SDO, SOHO...
R - solar rotations; KP - KIT PEAK solar observatory;
EE-date of possible geomag. disturbance in the Earth's environment.
G - geoeffectivity in last solar rotation; 
A-active geomagnetic condition.
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FROM 11.04/08 UT THE EARTH IS IN "-" SECTOR OF THE INTERPLANETARY MAG-
NETIC FIELD. THE FOLLOWING SECTOR BOUNDARY  -/+ THE EARTH HAS TO PASS 
27.04.

APRIL     13      14     15     16     17     18     19     APRIL
Wus      068     097    085    085    093    114    142          
F10.7    141     147    155    150    150    148    152
èbcg    B7.8    B6.6   B6.7   B7.5   B5.4   B5.3   B5.4      GOES
Sp       740    1290   1150    920    880    840    880  msh   
N                 2             1      1      1            
IMF       -       -      -      -      -      -      -       áóå   
Å>2   7.0å+5  7.4å+5 6.1å+5 2.7å+5 5.9E+7 1.5E+8 2.3å+8      GOES
Ie>2                                                     pfu GOES  
Ap        8      15      30     32     23     13     9   nT   
Dst     -10     -41     -56    -81    -71    -37    -31  nT  ëéïôï  
Amsc     10      16      38     32     17     16     14  nT  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 orbits 
in days according to GOES 15 in (electrons/cm2-s-sr) for events
> 1000 pfu.

THE GREATER THEN 2 MeV ELECTRON FLUX AT GEOSTATIONARY ORBIT BEGAN 16.
04/1330UT AND WAS OBSERVED 16 - 19.04. 

THE GREATER THAN 2 MeV ELECTRON FLUX  AT GEOSTATIONARY ORBIT OF VERY 
HIGH LEVEL IS EXPECTED 20 - 24.04.

The GEOMAGNETIC CONDITIONS WAS ACTIVE AND HIGH ALL DAYS, EXCEPT 13.04 
14.04 IT WAS OBSERVED PLANETARY 9 h. MAGNETIC SUBSTORM (G1). THE SOUR-
CE OF THIS DISTURBANCE WAS THE HIGH-SPEED STREAM OF THE SOLAR WIND OF 
LOW-LATITUDE PART OF VERY LARGE SUB POLAR CORONAL HOLE OF THE SOUTHERN 
HEMISPHERE OF THE SUN. The MODERATE MAGNETIC STORM (G2, Ams = 41, dur. 
= 48 h.) It was REGISTERED on APRIL 15- 17 according to the CENTRE IN 
BOULDER.  ACCORDING TO IZMIRAN DATA  IT  WERE  TWO MODERATE MAGNETIC 
STORMS: (G2, Ams=46, dur. = 21 h.) 15 - 16.04 AND (G2, Ams = 42, dur. 
= 15 h.) 16 - 17.04. SOURCES OF THIS LONG GEOMAGNETIC DISTURBANCE IT 
IS STILL UNKNOWN.

 NEXT WEEK THE GROWTH OF GEOMAGNETIC DISTURBANCE IS POSSIBLE 20-22.04 
WHEN THE EARTH  PASSES  THE HIGH-SPEED STREAM OF THE SOLAR WIND FROM 
SOUTHERN CORONAL HOLE. ON APRIL 22 TO THE EARTH CME FROM SOLAR FILA-
MENT EJECTA 19.04 WHICH WAS FOLLOWED BY ENDURING SOLAR FLARE CLASS 1F
/C5.2 AND CME "HALO" TYPE HAS TO COME. IN OTHER DAYS THE GEOMAGNETIC 
CONDITIONS IS EXPECTED UNSETTLED AND QUIET.

HIGHLIGHT AND FORECAST COMPOSED FROM DATA
OF NOAA SWPC, BOULDER, USA               http://www.swpc.noaa.gov,
OF THE SOLAR INFLUENCES DATA ANALYSIS CENTRE - 
SIDC, BRUSSELS, BELGIUM                   http://sidc.oma.be/index.php3, 
OF THE IZMIRAN, MOSCOW, TROITSK, RUSSIA  http://www.izmiran.ru