Provisional sunspot numbers April 2021 +------+----------------+-------------------+-------+--------------+ | | | | | | | Day | Groups | Wolf number | Beck | No. of Obs. | | | | | index | | | | N S Total | N S Total | | N/S T Beck | | | | | | | +------+----------------+-------------------+-------+--------------+ | 01. | 0.0 0.0 0.0 | 0 0 0 | 0 | 5 14 4 | | 02. | 0.0 0.0 0.0 | 0 0 0 | 0 | 5 15 6 | | 03. | 0.3 0.0 0.3 | 4 0 4 | 7 | 6 19 7 | | 04. | 0.8 0.0 0.8 | 11 0 11 | 30 | 3 11 4 | | 05. | 0.6 0.0 0.6 | 7 0 7 | 11 | 4 12 6 | | 06. | 0.5 0.0 0.5 | 5 0 5 | 5 | 6 16 6 | | 07. | 0.0 0.0 0.0 | 0 0 0 | 0 | 5 14 5 | | 08. | 0.0 0.1 0.1 | 0 1 1 | 0 | 7 13 5 | | 09. | 0.0 0.0 0.0 | 0 0 0 | 0 | 9 16 6 | | 10. | 0.0 0.0 0.0 | 0 0 0 | 0 | 6 13 5 | | 11. | 0.0 0.5 0.5 | 0 6 6 | 13 | 3 13 5 | | 12. | 0.0 0.7 0.7 | 0 11 11 | 39 | 7 14 6 | | 13. | 0.0 0.8 0.8 | 0 13 13 | 59 | 4 15 6 | | 14. | 0.0 0.7 0.7 | 0 14 14 | 90 | 7 16 6 | | 15. | 0.0 1.2 1.2 | 0 19 19 | 78 | 4 14 4 | | 16. | 0.0 1.6 1.6 | 0 22 22 | 92 | 5 15 7 | | 17. | 0.0 1.0 1.0 | 0 12 12 | 43 | 3 14 7 | | 18. | 0.1 0.8 1.0 | 1 14 15 | 122 | 5 13 5 | | 19. | 0.7 1.0 1.7 | 11 19 30 | 259 | 6 14 5 | | 20. | 1.1 1.6 2.7 | 18 23 41 | 432 | 10 21 8 | | 21. | 0.8 1.8 2.6 | 12 25 37 | 345 | 7 19 8 | | 22. | 0.6 1.6 2.2 | 9 23 32 | 247 | 8 17 8 | | 23. | 0.3 1.9 2.2 | 3 26 29 | 226 | 9 24 9 | | 24. | 0.4 2.5 2.9 | 5 35 40 | 308 | 7 18 7 | | 25. | 0.2 2.5 2.8 | 3 37 40 | 446 | 6 19 7 | | 26. | 0.1 2.5 2.6 | 1 39 40 | 500 | 8 21 9 | | 27. | 0.0 2.5 2.5 | 0 41 41 | 595 | 10 24 10 | | 28. | 0.0 2.5 2.5 | 0 35 35 | 345 | 9 22 10 | | 29. | 0.0 2.5 2.5 | 0 29 29 | 114 | 3 10 3 | | 30. | 0.0 1.8 1.8 | 0 20 20 | 98 | 7 16 6 | +------+----------------+-------------------+-------+--------------+ | Mean | 0.2 1.1 1.3 | 3.0 15.5 18.5 | 150 | 6 16 6 | +------+----------------+-------------------+-------+--------------+ | Days | 30 30 30 | 30 30 30 | 30 | | +------+----------------+-------------------+-------+--------------+ Based on 482 observations of 26 stations. Araujo,G. L 80 910 25 Junker,E. L 50 600 10 Barnes,H. L 76 910 15 Kaczmarek,A. L 80 400 9 Barsch,T. L1021000 24 Kysucka Obs. L2003000 13 Battaiola,R. S 901250 11 Meister,S. L125 800 27 Beltran,G.V. S2001600 30 Michalovce Obs. L1502250 10 Brettel,G. L 901000 22 Morales,G. S 902000 27 Bruegger,S. L 80 400 25 Rim. Sobota Obs.L1502250 12 Chudy,M. L 60 700 14 Ruemmler,F. L 801200 23 Daub,K.-P. L1521200 19 Schroeder,G. L 751200 20 Fritsche,S. L 63 840 22 Seiffert,H.-P. L100 500 16 Hoerenz,M. L 60 700 22 Selbmann,U. L 63 840 13 Hurbanovo Obs. L1502250 27 Suzuki,M. L100 0 24 Joppich,H. L 60 900 9 Wallian,D. L120 900 13