Weekly Bulletin on Solar and Geomagnetic Activity
                  Highlights on 27 - 30.05.2019,
                 Forecast on 31.05 - 09.06.2019,
    Carrington Rotation 2217, 2218 (06,0.05; 29.5.06.2019)    
            Earth out of ecliptic (-4.4 - -4.1) deg. 
             (S25 - N20 is zone of geoeffectiveness)

THE SUNSPOT-FORMING SOLAR ACTIVITY WAS AT THE VERY LOW LEVEL 
AND AFTER 19.05 THE SOLAR DISC IS SPOTLESS (86 SPOTLESS DAYS 
IN CURRENT YEAR). ESTIMATED, MOST LIKELY  WEEKLY AVERAGE VA-
LUE OF THE RELATIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYS-
TEM (old) FOR PERIOD W = 0 (Wn = 0). 

NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY WAS ON VERY LOW AND 
LOW LEVELS.  1.06 ON VISIBLE SOLAR DISC FROM E-LIMB WIL AP-
PEARED THE SUNSPOT GROUP ON SECOND ROTATION.  LIKELY WEEKLY 
AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN THE INTERNA-
TIONAL SYSTEM (old) FOR THE NEXT WEEK IS W=010+20/-10. 

 FLARE ACTIVITY WAS AT THE VERY LOW LEVEL. NO FILAMENT EJECTI-
ONS AND CORONAL MASS EJECTIONS HAVE BEEN OBSERVED. 
-------------------------------------------------------------------
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 × ÇÒÁÄ.  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:
-----------------------------------------------------------------------
 sign N end   E end   S end   W end    Sch    EE   R   G  Space Obser.
CH -  N10L073 N08L083 S12L078 S11L063  ~3,0% 27.05 R2  -  SDO, SOHO...
CH -  N05L080 S20L085 S30L075 S20L062  ~3,0% 30.05 R2  -  SDO, SOHO...
Both CH "friable" and with high probability not geoeffective;
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.
----------------------------------------------------------------------

 THE ANALYSIS TESTIFIED THAT AFTER 21.04/0140 UT EARTH IS IN "+" SECTOR 
OF THE INTERPLANETARY MAGNETIC FIELD. THE SIGN OF THE FIELD IS UNSTABLE 
AND OFTEN VARIABLE IN VERY SMALL VALUES. NEXT SECTOR BOUNDARY  -/+  THE 
EARTH MUST PASS 01.06.
----------------------------------------------------------------------- 
MAY      27     28     29     30    MAY
Wus     000    000    000    000 
F10.7   068    068    068    069 
èbcg   á6.2   á6.5   á6.8   á7.3    GOES
Sp      000    000    000    000    msh   
N                                
IMF      +      +      +      +      DSCOVR   
Å>2  1.6E+6 1.6E+6 3.5E+6  5.3+7    GOES
Ie>2    119           171   1766    pfu 
Ap       10     8      14     8     nô  
Dst                                 nô KIOTO
Amsc     11     9      15     10    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 BEGINED 
30.05/1535 UT AND OBSERVED 30.05. 
 
NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX  AT GEOSYNCHRONOUS OR-
BIT IS EXPECTED 31.05 - 10.06.

 THE GEOMAGNETIC CONDITION AT MIDDLE LATITUDES REMAINED QUIET AND UN-
SETTLED.   

NEXT WEEK THE GEOMAGNETIC CONDITION IS MOST PROBABLE QUIET AND UNSET-
TLED. THE ACTIVE GEOMAGNETIC CONDITION AFTER 05.06 IS POSSIBLE BECAU-
SE TWO SUNSPOT GROUP ACTIVITY.

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