Weekly Bulletin on Solar and Geomagnetic Activity
                  Highlights on 20 - 26.05.2019,
                 Forecast on 27.05 - 02.06.2019,
            Carrington Rotation 2217 (06,0.05.2019)    
            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 (82 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 LEVEL,
AND THE SUN EXPECTED BE SPOTLESS. LIKELY WEEKLY AVERAGE VALUE 
OF THE RELATIVE SUNSPOT NUMBER  IN  THE INTERNATIONAL  SYSTEM 
(old) FOR THE NEXT WEEK IS W=010+10/-10. 

 FLARE ACTIVITY WAS AT THE VERY LOW LEVEL. NO FILAMENT EJECTI-
ONS AND MORE 2 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 -  S05L214 S12L222 S25L220 S15L202  <5,9% 21.05 R6  -  SDO, SOHO...
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.
----------------------------------------------------------------------

 AFTER 23.04/22 UT EARTH IS IN "-" SECTOR OF THE INTERPLANETARY MAGNE-
TIC FIELD, BUT THE SIGN "+" OBSERVED 21/0140 - 22/0730 UT. NEXT SECTOR 
BOUNDARY -/+ THE EARTH MUST PASS 17.06.
----------------------------------------------------------------------- 
íáê      20     21     22     23     24     25     26   íáê
Wus     000    000    000    000    000    000    000
F10.7   069    068    067    067    066    067    068
èbcg   á6.7   á6.3   á6.3   á6.2   á6.3   á6.3   á6.3   GOES
Sp      000    000    000    000    000    000    000  msh   
N                                                   
IMF      -     -/+    +/-     -      ~     ~      -/~    DSCOVR   
Å>2  3.4E+6 3.7E+6 5.8E+6  6.0+6 3.7å+6 4.5E+6 5.0å+6   GOES
Ie>2    579    112    166    166    130    131    117   pfu 
Ap       6      4      4      4      5      4      5    nô  
Dst                                                     nô KIOTO
Amsc     8      3      5      6      6      4      4    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 NOT OB
SERVED.  
 
NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX  AT GEOSYNCHRONOUS OR-
BIT IS NOT EXPECTED.

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

NEXT WEEK THE GEOMAGNETIC CONDITION IS MOST PROBABLE QUIET AND UNSET-
TLED BUT WITH FEW CHANCES FOR ISOLATED ACTIVE LEVEL 27-30/05 DUE TO
EFFECT OF CORONAL HOLES. 

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