Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 24 - 30.08.2020, Forecast on 31.08 - 06.09.2020, Carrington Rotation 2234 (07,74.09.2020) Earth out of ecliptic (3.8 - 4.2) 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 (166 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. 10 SOLAR FLARE OF LOW X-RAY CLASS "A", FIVE CORONAL MASS EJECTIONS (27, 29.08) 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 24.08 >1639 >0608 N56E12L187 15 27.08 >0040 >1332 N28E65L198 8 -------------------------------------------------------------------- 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. ---------------------------------------------------------------------- AUGUST 24 25 26 27 28 29 30 AUGUST Wus 000 000 000 000 000 000 000 F10.7 070 070 070 070 070 070 070 èbcg 2 1.4E+6 1.3å+6 1.2E+6 1.4E+6 1.6E+6 2.5E+7 9.9å+7 GOES Ie>2 179 209 132 160 161 947 2801 pfu Ap 3 4 7 8 10 14 7 nô Dst nô KIOTO Amsc 3 4 5 9 10 11 9 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 NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS OR- BIT IS NOT EXPECTED. THE GEOMAGNETIC CONDITION REMAINED QUITE AND UNSETTLED ALL PERIOD. NEXT WEEK ON THE FIRST DAY A MINOR MAGNETIC STORM IS POSSIBLE FROM THE JOINT IMPACT OF DISTURBANCES FROM THE SOLAR FILAMENT EJECTION AT 27.08 AND THE PASSAGE OF THE LOW-LATITUDE (N28) PART OF THE NORTHERN POLAR CORONAL HOLE. ON THE OTHER DAYS, THE MOST PROBABLE IS QUIET AND UNSETT- LED GEOMAGNETIC 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