Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 23 - 30.03.2020, Forecast on 30.03 - 06.04.2020, Carrington Rotations 2228, 2229 (01,03.03; 28,37.03.2020) Earth out of ecliptic (-6.9 - -6.6) deg. (S35 - N20 is zone of geoeffectiveness) THE SUNSPOT-FORMING SOLAR ACTIVITY REMAINED VERY LOW WITH A SPOTLESS VISIBLE DISK (69 SPOTLESS DAYS IN THE 2020). ESTIMA- TED, MOST LIKELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR PERIOD W=0 (Wn=0) NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY WAS ON VERY LOW LEVEL. LIKELY 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 THE VERY LOW LEVEL. NO SOLAR FLARE, SO- LAR FILAMENT EJECTION AND ONE CORONAL MASS EJECTIONS (23.09) WAS OBSERVED OF THE PERIOD. ------------------------------------------------------------------- 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 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. ---------------------------------------------------------------------- AFTER 12.03/20 UT THE IMF SECTOR SIGN WAS "-". NEXT WEEK THE BEHAVIOR OF THE SECTOR STRUCTURE SIGN WILL NOT CHANGE. NEXT IMF SECTOR BOUNDER THE EARTH WILL PASS AT 04.04. ----------------------------------------------------------------------- MARCH 23 24 25 26 27 28 29 MARCH Wus 000 000 000 000 000 000 000 F10.7 070 071 071 070 069 069 068 èbcg 2 2.9E+7 5.2å+7 5.7E+7 5.3E+7 9.4E+6 1.0E+7 5.2å+6 GOES Ie>2 1230 1303 1398 1658 791 481 278 pfu Ap 12 4 4 5 5 5 7 nô Dst nô KIOTO Amsc 12 4 5 11 7 7 10 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 BEGAN 23.09/1635 UT AND OBSERVED 23-26.09. NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS OR- BIT IS NOT EXPECTED. THE GEOMAGNETIC CONDITION AT MID-LATITUDES REMAINED QUITE AND UNSET- TLED ALL DAYS. 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