Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 21 - 27.06.2021, Forecast on 28.06 - 4.07.2021, Carrington Rotation 2245 (07,69.06.2021) Earth out of ecliptic (-0.5 - 0.1) deg. (S32 - N32 is zone of geoeffectiveness) THE SUNSPOT-FORMING SOLAR ACTIVITY REMAINED ON LOW LEVEL. THE ES- TIMATED MOST LIKELY WEEKLY AVERAGE VALUE OF THE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR PERIOD IS W=10+9/-3 (Wn=17+15/ -6). THERE WERE 5 SMALL QUITE SUNSPOT GROUPS ON THE VISIBLE SOLAR DISK HAS BEEN OBSERVED. NEXT WEEK SUNSPOT ACTIVITY WILL BE ON LOW LEVEL. WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR NEXT WEEK IS W=020+20/-10. FLARE ACTIVITY WAS AT LOW LEVELS. 2 SOLAR FLARE OF X-RAY "C" CLASS, 25 -"B", FOUR EJECTA OF SOLAR FILAMENTS (ONE RESTORABLE SOLAR FILA- MENTS EJECTED 3 CONSECUTIVE DAYS) AND 15 CORONAL MASS EJECTIONS (21 -27.06) 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 deg. Fl AR CME/to 24.06 >0039 >1249 N42W15L120 12 24.06 0749 0804 N29W47L088 17 B.5A 25.06 >0137 >1247 N44W41L083 8 26.06 0857 1027 N41W26L084 10 27.06 <0127 NW ? CME/0127 -------------------------------------------------------------------- NEXT WEEK THE FLARE ACTIVITY IS EXPECTED AT LOW AND 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 Sp/craft óH* + N60l078 N25L080 N22L068 N35L065 <2% 30.06 1 SDO,SOHO... * - low geoeffectivity, the substorms with duration <6 h. only. 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 23.06/03 UT THE EARTH IS IN THE "+" SECTOR OF THE INTERPLANETARY MAGNETIC FIELD. FOLLOWING SECTOR BOUNDARY "+/-" IT CAN BE EXPECT 04.07. ---------------------------------------------------------------------- JUNE 21 22 23 24 25 26 27 éàîø Wus 011 012 011 011 025 016 032 F10.7 079 081 080 081 083 082 087 èbcg á6.7 á9.3 á9.7 á8.7 ÷1.0 ÷1.3 ÷1.4 GOES Sp 120 130 140 140 220 130 250 msh N 1 IMF - - -/+ + + + + DSCOVR Å>2 1.4å+8 3.0E+7 2.8å+7 3.5E+7 2.5E+6 3.1E+6 4.0å+6 GOES Ie>2 3330 1620 730 1093 540 223 302 pfu Ap 4 7 4 5 7 4 3 nô Dst nô KIOTO Amsc 4 8 4 6 7 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 RECURRENT ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT BEGUN AT 17/0835 UT AND OBSERVED 17-22.06. NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT IS NOT EXPECTED. THE GEOMAGNETIC CONDITION REMAINED QUIET ALL DAYS. IN THE NEXT WEEK THE MOST PROBABLE IS EXPECTED A QUITE AND UN- SETTLED GEOMAGNETIC CONDITION. 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