:Issued: 2026 Apr 01 07:39 UTC :Product: documentation at http://www.sidc.be/products/ri #-------------------------------------------------------------# # MONTHLY TABLE OF THE INTERNATIONAL TOTAL SUNSPOT NUMBER # # AND 12-MONTH PREDICTIONS from the World Data Center SILSO # #-------------------------------------------------------------# Provisional International monthly mean Sunspot Number for March 2026 : 85.9 (eighty-five point nine) Maximum : 136 on 27 // Minimum : 29 on 20 Provisional daily International Sunspot Numbers for March 2026 : 1.. 75 6.. 82 11..105 16.. 69 21.. 41 26..112 31..135 2.. 76 7.. 78 12.. 95 17.. 61 22.. 99 27..136 3.. 78 8.. 74 13.. 80 18.. 59 23..111 28..128 4.. 65 9.. 75 14.. 57 19.. 34 24..109 29..133 5.. 85 10.. 79 15.. 64 20.. 29 25..105 30..133 73 cooperating stations on April 1, 08 UT Predictions of the monthly smoothed Sunspot Number using the last provisional value, calculated for September 2025 : 112.9 (+-5%) SM CM SM CM SM CM 2025 Oct 111 112 2026 Apr 98 112 2026 Oct 86 102 Nov 111 113 May 97 110 Nov 83 99 Dec 105 114 Jun 95 108 Dec 80 95 2026 Jan 103 114 Jul 93 106 2027 Jan 77 92 Feb 102 114 Aug 90 104 Feb 75 88 Mar 100 113 Sep 88 103 Mar 72 85 SM : SIDC classical method : based on an interpolation of Waldmeier's standard curves; the estimated error ranges from 7% (first month) to 35% (last month) CM : Combined method : the combined method is a regression technique coupling a dynamo-based estimator with Waldmeier's idea of standard curves, due to K. Denkmayr. ref. : K. Denkmayr, P. Cugnon, 1997 : "About Sunspot Number Medium-Term Predictions", in "Solar-Terrestrial Prediction Workshop V", eds. G. Heckman et al., Hiraiso Solar Terrestrial Research Center, Japan, 103 #--------------------------------------------------------------------# # World Data Center SILSO # # Sunspot Index and Long-term Solar Observations # # Royal Observatory of Belgium # # Tel.: ../32/(0)2/373 02 33 Fax : ../32/(0)2/374 98 22 # # Please do not reply directly to this message # # For more information, contact: silso.info@oma.be # # or visit first our Web site at: http://www.sidc.be/silso # # To unsubscribe, visit http://sidc.be/registration/unsub.php # #--------------------------------------------------------------------# ---------------------------------------------------------------------- | Legal notices: | | - Intellectual Property Rights: | | http://www.astro.oma.be/common/internet/en/data-policy-en.pdf | | - Liability Disclaimer: | | http://www.astro.oma.be/common/internet/en/disclaimer-en.pdf | | - Use and processing of your personal information: | | http://www.astro.oma.be/common/internet/en/privacy-policy-en.pdf | ----------------------------------------------------------------------