:Issued: 2026 Mar 01 09:17 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 February 2026 : 78.2 (seventy-eight point two) Maximum : 168 on 3 // Minimum : 4 on 22 Provisional daily International Sunspot Numbers for February 2026 : 1..103 6..141 11.. 92 16.. 76 21.. 15 26.. 34 2..134 7..141 12.. 81 17.. 67 22.. 4 27.. 46 3..168 8..144 13.. 67 18.. 43 23.. 8 28.. 58 4..148 9..119 14.. 77 19.. 42 24.. 6 5..140 10..114 15.. 72 20.. 35 25.. 15 69 cooperating stations on March 1, 09 UT Predictions of the monthly smoothed Sunspot Number using the last provisional value, calculated for August 2025 : 118.2 (+-5%) SM CM SM CM SM CM 2025 Sep 114 115 2026 Mar 107 115 2026 Sep 96 104 Oct 116 113 Apr 106 113 Oct 93 102 Nov 113 114 May 104 112 Nov 90 99 Dec 112 115 Jun 102 109 Dec 88 95 2026 Jan 110 115 Jul 100 107 2027 Jan 85 92 Feb 109 115 Aug 98 105 Feb 82 88 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 | ----------------------------------------------------------------------