Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 31.08 - 06.09.2020, Forecast on 07 - 06.09.2020, Carrington Rotation 2234, 2235(11,49.08; 07,74.09.2020) Earth out of ecliptic (4.3 - 4.8) deg. (S20 - N30 is zone of geoeffectiveness) THE SUNSPOT-FORMING ACTIVITY REMAINED ON VERY LOW LEVEL. THE SUN's VISIBLE DISK WAS SPOTLESS ALL DAYS (173 SPOTLESS DAYS AT 2020). ESTIMATED, MOST LIKELY WEEKLY AVERAGE VALUE OF THE SUN- SPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR PERIOD W= 0 (Wn= 0). NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY WAS ON VERY LOW LEVEL. VISIBLE SOLAR DISK WITH HIGH PROBABILITY WILL BE SPOTLESS. LI- KELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR NEXT WEEK IS W=010+10/-10. FLARE ACTIVITY WAS AT VERY LOW LEVEL. 9 SOLAR FLARE OF LOW X-RAY CLASS "A", THREE CORONAL MASS EJECTIONS (4, 5.09) HAVE BEEN OB- SERVED. ------------------------------------------------------------------- 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 -------------------------------------------------------------------- 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 Spacecraft CH + Pn N38W00L083 N28W18L065 N35W43L040 6.8 31.08 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. ---------------------------------------------------------------------- FROM 25.08/14 UT, THE EARTH IS IN THE "+" SECTOR OF THE INTERPLANE- TARY MAGNETIC FIELD. THE FOLLOWING THE NEXT SECTOR BOUNDARY "+/-" IT CAN EXPECT 16.09. ---------------------------------------------------------------------- áUGUST 31 01 02 03 04 05 06 SEPTEMBER Wus 000 000 000 000 000 000 000 F10.7 070 070 070 070 070 069 070 èbcg A1.1 A1.1 A1.8 A1.6 A1.4 A1.0 A1.2 GOES Sp 000 000 000 000 000 000 000 msh N IMF + + + + + + + DSCOVR Å>2 7.6E+7 4.1å+8 7.6E+8 6.0E+8 5.3E+8 1.4E+8 2.3å+8 GOES Ie>2 3504 13564 29370 14197 15347 3973 5373 pfu Ap 26 16 9 4 8 6 4 nô Dst -67 -65 -63 -48 -58 -53 -61 nô KIOTO Amsc 22 16 8 3 8 5 6 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 HAVE BEGUN AT 30.08/1325 UT AND OBSERVED AT 30.08-06.09. NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS OR- BIT IS EXPECTED 7-10.09. MINOR MAGNETIC STORM (Ams = 32, G1, dur. = 21 h.) REGISTERED 31.08 ACCORDING TO THE BOULDER CENTER DATA AND (Ams= 23, G0, dur.=21 h.) ACCORDING IZMIRAN DATA-THE COMBINED RESULT OF LOW LATITUDE PART OF SUB-POLAR CORONAL HOLE AND DISTURBANCE FROM SOLAR FILAMENT EJECTION 27.08. IN THE OTHER DAYS, THE GEOMAGNETIC CONDITION REMAINED QUIET AND UNSETTLED. ON THE OTHER DAYS, THE MOST PROBABLE IS QUIET AND UNSETTLED GEOMAG- NETIC CONDITION. NEXT WEEK THE MOST PROBABLY QUIET AND UNSETTLED GEOMAGNETIC CONDI- TION WILL OBSERVED. 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