Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 22 - 26.05.2017, Forecast on 27.05 - 04.06.2017, Carrington Rotation 2190, 2191 (29,63.04; 26,85.05.2017) Earth above the ecliptic (-1,7; -1,3) deg. (S35 - N25 is geoeffectiveness zone) SUNSPOT-FORMING ACTIVITY WAS ON THE MIDDLE LEVEL 22-23.05, AND THE LOW-IN OTHER DAYS. THE ESTIMATED, MOST LIKELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR THE PERIOD (5 DAYS) IS W=17+16/-8 (Wn=28+26/-14). ON THE VISI- BLE DISC OF THE SUN 4 - 1 SMALL QUITE SUNSPOT GROUP HAVE BEEN OB- SERVED. NEXT WEEK SUNSPOT-FORMING ACTIVITY IS EXPECTED AT THE LOW LEVEL. THE ESTIMATED, MOST LIKELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR THE NEXT WEEK IS W = 20+20/-15. FLARE ACTIVITY WAS AT THE VERY LOW LEVEL ALL DAYS. 2 SOLAR FILAMENT EJECTIONS OCCURRENCES THROUGH THE PERIOD. ACCORDING TO THE SOHO AND STEREO CORONOGRAPHS DATA >4 CMEs HAVE BEEN OBSERVED. ---------------------------------------------------------------------- FLARES to tm te local. Class E(1-8A) AR RII/IV CME X-ray/Ïp J/m-2 DSF to te ËÏÏÒÄÉÎÁÔÙ l × ÇÒÁÄ. Fl Aï CME/to 22.05 >0920 >2325 S08E06L051 25 25.05 >1619 >0618 N07W07L024 8 --------------------------------------------------------------------- NEXT WEEK FLARE ACTIVITY IS EXPECTED TO BE 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 Space Obser. óî + N28L032 N23L027 N20L034 N25L036 28.05 1 SDO, SOHO... Sch - CH Square in Mm**2 (in square megameters) near the central meri- dian on http://sdowww.lmsal.com/suntoday/; n/d - no data; R - solar rotations; EE-date of possible geomag. disturbance in the Earth's environment. G(0-5)-geoeffectivity in last solar rotation on the middle latitudes. A-active geomagnetic condition. ------------------------------------------------------------------------ AFTER 4.05/0224 UT THE EARTH IS IN "-" SECTOR OF THE INTERPLANETARY MAG- NETIC FIELD. NEXT SECTOR BOUNDARY -/+ EARTH SHOULD BE PASSED 0N 27.05. íáê 22 23 24 25 26 íáê Wus 055 043 015 019 022 F10.7 074 076 078 076 080 èbcg A6.0 á7.0 á8.0 á8.7 B1.0 GOES Sp 052 050 030 080 170 msh N 1 IMF - - - - - DSCOVR Å>2 8.0å+8 3.7E+8 6.4E+8 9.6å+8 8.0å+8 GOES Ie>2 26099 9337 13965 17618 19744 pfu Ap 10 10 7 3 7 nô BOULDER Dst nô KIOTO Amsc 11 9 4 4 3 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 GOES15 in (electrons/cm2.s.sr) for events > 1000 pfu. THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT BEGIN 20.05/1705 UT IN RESPONSE TO ELEVATED WIND SPEED FROM CH HSS INFLU- ENCE AND OBSERVED 22 - 26.05. THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSTATIONARY ORBIT OF VERY HIGH LEVEL IS EXPECTED 27.05 - 04.06. GEOMAGNETIC CONDITION WAS QUIET AND UNSETTLED ALL DAYS. ON THE NEXT WEEK THE QUIET AND UNSETTLED GEOMAGNETIC CONDITION TO BE EXPECTED. 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