------------------------------------------------------------------- THE RELATIVE MONTHLY MEAN SUNSPOT NUMBER ON APRIL 2017 HAS MADE Wapr. = 20.8 32.6(н.) THAT GIVES FOR 93 MONTHS (2016, ORTOBER) DEVELOPMENT CURRENT 24 CYCLE OF SOLAR ACTIVITY THE SMOOTHED MONTHLY MEAN SUNSPOT NUMBER W*окт. = 20.1; 31.4 - в новой системе W*сен. = 19.9; 33.3 - в новой системе On July 1, 2015 Centre in Brussels moved to a new system of cal- culation the relative number of sunspots and practically all of the values were replaced throughout the numbered series of Wolf numbers (see link). While there is addictive, I recalculated (0.6) to the old system, but only W*, and present below the new values for the minimum and maximum of 24 cycles SA. THE BEGINNING OF 24 SOLAR CYCLE - I 2009 with W*=1.8; (2.2) THE TIME OF THE CURRENT CYCLE MAXIMUM - IV 2014, - Wmax = 82;(116.4) THE END OF 24 SOLAR CYCLE (THE POINT OF MINIMUM) - IV - VI 2020; THE INTERNATIONAL DAILY VALUE OF RELATIVE SUNSPOT NUMBER FOR 2017, APRIL ACCORDING DATA OF 78 SOLAR OBSERVATORIES HAS MADE: 1.. 71 6.. 36 11.. 14 16.. 0 21m. 40 26.. 39 2.. 84 7.. 24 12.. 23 17.. 0 22m. 31 27.. 27 3..100M 8.. 0m 13.. 25 18.. 24 23.. 43 28.. 36 4.. 75 9.. 12 14.. 21 19.. 16 24.. 46 29.. 34 5.. 50 10.. 14 15.. 0m 20.. 28 25.. 42 30.. 24 THE MONTHLY MEAN OF OBSERVED RADIO FLUX OF THE 10 cm (2800 MHz ON 2017, APRIL, AND SMOOTHES ON 2016, OKTOBER F10.7 apr. = F*10.7 oct.= THE MONTHLY MEAN OF GEOMAGNETIC Ap-index ON 2016, MARCH, AND SMOOTHES ON 2016, SEPTEMBER Ap apr. = Ap*okt. = ------------------------------------------------------------------- Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 24 - 30.04.2017, Forecast on 01 - 08.05.2017, Carrington Rotations 2189, 2190 (02,37.04; 29,63.04.2017) Earth above the ecliptic (-5.4, -5,0) deg. (S30-N28 is geoeffectiveness zone) SUNSPOT-FORMING ACTIVITY WAS ON MIDDLE LEVEL ALL DAYS BESIDE 27.04 (LOW). THE ESTIMATED, MOST LIKELY WEEKLY AVERAGE VALUE OF THE RELA- TIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR THE THE PERIOD IS W=20+5/-6 (Wn= 33+6/-11)). ON THE VISIBLE DISC OF THE SUN 2- 3 SMALL QUITE SUNSPOT GROUP. NEXT WEEK SUNSPOT-FORMING ACTIVITY IS EXPECTED AT THE MIDDLE AND THE LOW LEVELS. 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/-20. FLARE ACTIVITY WAS AT THE VERY LOW LEVEL ALL DAYS. 1 SOLAR FILAMENT EJECTION OCCURRENCES THROUGH THE PERIOD. ACCORDING TO THE SOHO AND STEREO CORONOGRAPHS DATA > 9 CMEs. ---------------------------------------------------------------------- FLARES to tm te local. Class E(1-8A) AR RII/IV CME X-ray/оp J/m-2 DSF to te координаты l в град. Fl AО CME/to 24.04 >0116 >1307 N34E26L045 32 ---------------------------------------------------------------------- NEXT WEEK FLARE ACTIVITY IS EXPECTED AT VERY LOW LEVELS. 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. CH - N20L111 S10L093 S15L107 S05L124 66200 24.04 7 G2 SDO, SOHO.. CH - S16L102 S20L077 S38L092 S20L107 66200 25.04 7 G1 SDO, SOHO.. CH - S30L067 S38L065 S60L053 S35L082 25000 28.04 7 G0 SDO, SOHO.. These CH is family by south polar CH "-" polarity; 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 21/1538 UT THE EARTH IS IN "-" SECTOR OF THE INTERPLANETARY MAG- NETIC FIELD. THE FOLLOWING SECTOR BOUNDARY -/+ THE EARTH HAS EXPECTED TO PASS 15.05. APRIL 24 25 26 27 28 29 30 APRIL Wus 041 036 036 023 035 034 033 F10.7 080 081 080 081 078 077 077 Хbcg В1.0 А9.2 А9.5 А9.0 А8.5 А7.3 А7.3 GOES Sp 210 150 140 110 100 080 060 msh N 1 IMF - - - - - - - DSCOVR е>2 1.2Е+9 1.6Е+9 2.4E+9 2.8E+9 2.8Е+7 7.6Е+8 2.7Е+8 GOES Ie>2 54298 52302 66472 54174 50297 35070 8928 pfu Ap 22 15 9 8 5 6 3 nТ BOULDER Dst -54 -50 -38 -36 -33 -29 -25 nТ KIOTO Amsc 17 12 10 8 6 7 5 nТ IZMIRAN ------------------------------------------------------------------ е>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 WAS BE- GINING AT 21.04/1425 UT AND OBSERVED AT 21-30.04. THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSTATIONARY ORBIT OF VERY HIGH LEVEL IS EXPECTED 1 - 2.05. THE MINOR MAGNETIC STORM (G2, Ams= 37, dur. = 33 h.) ACCORDING TO IZMIRAN DATA AND (G2, Ams = 37, dur.= 69 h.) ACCORDING TO THE CENTER IN BOULDER HAVE BEGUN IN THE SECOND HALF 21.04. THIS GEOMAGNETIC DIS- TURBATION PROBABLY BECAME RESULT OF ICME ARRIVAL FROM DSF 19.04. IN OTHER DAYS GEOMAGNETIC CONDITION WAS UNSETTLRD AND QUITE. NEXT WEEK GEOMAGNETIC CONDITION WILL BE QUIET AND UNSETTLED. 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