Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 07 - 13.09.2020, Forecast on 14 - 21.09.2020, Carrington Rotation 2234, 2235(11,49.08; 07,74.09.2020) Earth out of ecliptic (4.9 - 5.5) deg. (S20 - N35 is zone of geoeffectiveness) THE SUNSPOT-FORMING ACTIVITY REMAINED ON VERY LOW LEVEL. THE SUN's VISIBLE DISK WAS SPOTLESS ALL DAYS (179 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. 7 SOLAR FLARE OF LOW X-RAY CLASS "A",ONE SOLAR FILAMENT EJECT AND 8 CORONAL MASS EJECTIONS (7, 8, 13.09) 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 08.09 ~0330 W-limb 262deg ? CME -------------------------------------------------------------------- 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 * - 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 11.09/1450 UT, THE EARTH IS IN THE "+" SECTOR OF THE INTERPLANE- TARY MAGNETIC FIELD. 8/1725-11/1450 UT THE SIGN OF SECTOR WAS "-". THE FOLLOWING THE NEXT SECTOR BOUNDARY "+/-" IT CAN EXPECT 16.09. ---------------------------------------------------------------------- AUGUST 07 08 09 10 11 12 13 SEPTEMBER Wus 000 000 000 000 000 000 000 F10.7 070 070 070 069 069 069 070 èbcg A1.1 2 3.6E+8 2.9å+8 1.5E+8 1.2E+8 1.3E+8 3.6E+7 5.2å+7 GOES Ie>2 10220 9181 4357 3580 4801 1788 1508 pfu Ap 4 4 1 2 3 5 6 nô Dst nô KIOTO Amsc 4 4 2 3 3 4 5 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 30.08-13.09. NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS OR- BIT IS EXPECTED 14-15.09. ALL DAYS, THE GEOMAGNETIC CONDITION REMAINED QUIET. 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