------------------------------------------------------------------- THE RELATIVE MONTHLY MEAN SUNSPOT NUMBER ON MARCH 2018 HAS MADE Wfeb. = 1.5 2.5(n) THAT GIVES FOR 104 MONTHS (2017, SEPTEMBER) DEVELOPMENT CURRENT 24 CYCLE OF SOLAR ACTIVITY THE SMOOTHED MONTHLY MEAN SUNSPOT NUMBER W*sep. = 10.9; 18.3 - in new system W*aug. = 11.7 19.5 - in new system On July 1, 2015 Centre in Brussels moved to a new system of calcu- lation 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 - X 2020; THE INTERNATIONAL DAILY VALUE OF RELATIVE SUNSPOT NUMBER FOR 2018, MARCH ACCORDING DATA OF 73 SOLAR OBSERVATORIES HAS MADE: 1.. 12 6.. 0 11.. 0 16.. 0 21.. 0 26.. 0 31.. 13 2.. 11 7.. 0 12.. 0 17.. 15M 22.. 0 27.. 0 3.. 0 8.. 0 13.. 0 18.. 14 23.. 0 28.. 0 4.. 0 9.. 0 14.. 0 19.. 0 24.. 0 29.. 0 5.. 0 10.. 0 15.. 0 20.. 0 25.. 0 30.. 12 THE MONTHLY MEAN OF OBSERVED RADIO FLUX OF THE 10 cm (2800 MHz ON MARCH 2018, AND SMOOTHES ON 2017, SEPTEMBER F10.7 mar. = 68.4 F*10.7 sep. = 75.9 THE MONTHLY MEAN OF GEOMAGNETIC Ap-index ON MARCH 2018 AND SMOOTHES ON 2017, SEPTEMBER Ap mar. = 8 Ap*sep. = 10.3 ------------------------------------------------------------------- Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 26.03 - 01.04.2018, Forecast on 02 - 09.04.2018, Carrington Rotation 2002 (22.92.03.2018) Earth out of ecliptic (-4.1 - -3.7 deg. (S30 - N25 is geoeffectiveness zone) THE SUNSPOT-FORMING ACTIVITY OF THE SUN WAS ON VERY LOW LEVEL, THE VISIBLE DISK WAS SPOTLESS 26 - 29.03 AND 1.04 (53 DAYS AT CURRENT YEAR). THE ESTIMATED, MOST LIKELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUMBER IN THE INTERNATIONAL SYSTEM (old) FOR THE PERIOD W=002+5/-2 (Wn= 003+8/-3). 28.03 TO THE VISIBLE DISK OF THE SUN IN THE SOUTHERN HEMISPHERE THERE WAS A SMALL ACTIVE REGION IN WHICH 30-31.02 ONE SPOT WAS FORMED. NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY WILL BE ON THE VERY LOW. LIKELY WEEKLY AVERAGE VALUE OF THE RELATIVE SUNSPOT NUM- BER IN THE INTERNATIONAL SYSTEM (old) FOR THE NEXT WEEK IS W =010+10/-10. FLARE ACTIVITY WAS ON THE LOW LEVEL 30.02 AND THE VERY LOW ON OTHER DAYS. 2 EJECTA OF SOLAR FILAMENTS REGISTERED ON PERIOD. THERE ARE >13 CORONAL MASS EJECTIONS HAVE BEEN OBSERVED. ---------------------------------------------------------------------- FLARES FROM M1 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 26.03 >0045 >1329 N27W53L228 8 01.04 >0046 >1358 S47E27L255 3 --------------------------------------------------------------------- NEXT WEEK THE 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. óî + N60L317 N45L017 N10L309 N12L294 28.03 7 SOHO,SDO... óî + N60L228 N42L288 N16L208 N12L188 31000 02.04 >3 SOHO,SDO... 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 29.03/0090 UT EARTH IS IN "+" SECTOR OF INTERPLANETARY MAGNETIC FIELD. NEXT SECTOR BOUNDARY +/- THE EARTH MUST PASS 04.04. MARCH 26 27 28 29 30 31 01 APRIL Wus 000 000 000 000 011 012 000 F10.7 068 068 069 069 069 069 069 èbcg <á1.0 <á1.0 <á1.0 <á1.0 <á1.0 á2.0 <á1.0 GOES Sp 000 000 000 000 010 010 000 msh N IMF ~/- ~/- -/~ -/+ - DSCOVR Å>2 3.4E+8 1.4E+9 2.3E+9 1.3å+9 4.6å+8 1.6å+8 1.0å+8 GOES Ie>2 8088 42354 43686 35131 14850 9268 3767 pfu Ap 11 8 1 4 4 7 5 nô Dst nô KIOTO Amsc 12 7 2 6 5 7 7 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 HAS BEGAN AT 16.03/0105 UT AND OBSERVED 16.03 - 1.04. NEXT WEEK THE GREATER THAN 2 MeV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT IS EXPECTED 2 -3.04. GEOMAGNETIC CONDITION WAS UNSETTLED AND QUIET. NEXT WEEK THE GEOMAGNETIC FIELD IS EXPECTED TO BE PRIMAILY UNSET- TLED AND QUIET. 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