Provisional sunspot numbers April 2011 +------+----------------+-------------------+-------+--------------+ | | | | | | | Day | Groups | Wolf number | Beck | No. of Obs. | | | | | index | | | | N S Total | N S Total | | N/S T Beck | | | | | | | +------+----------------+-------------------+-------+--------------+ | 01. | 1.7 0.8 2.5 | 29 11 40 | 775 | 10 16 9 | | 02. | 1.7 1.0 2.8 | 33 13 46 | 864 | 11 27 14 | | 03. | 2.5 0.1 2.6 | 44 1 45 | 753 | 7 20 10 | | 04. | 3.1 0.1 3.2 | 48 1 49 | 713 | 9 19 11 | | 05. | 2.4 0.2 2.6 | 35 3 38 | 542 | 5 11 4 | | 06. | 3.0 0.3 3.2 | 43 3 46 | 532 | 8 20 8 | | 07. | 3.2 0.8 4.0 | 47 9 56 | 309 | 10 23 11 | | 08. | 3.2 1.4 4.6 | 47 19 66 | 395 | 9 20 9 | | 09. | 3.1 0.9 4.0 | 47 12 59 | 277 | 10 26 13 | | 10. | 1.8 0.8 2.5 | 36 10 46 | 408 | 12 29 14 | | 11. | 2.6 0.4 3.0 | 50 5 55 | 587 | 12 26 12 | | 12. | 3.7 0.3 4.0 | 66 3 69 | 723 | 7 16 4 | | 13. | 4.7 0.3 5.0 | 83 4 87 | 1310 | 7 17 7 | | 14. | 5.2 0.4 5.6 | 96 4 100 | 1767 | 8 20 9 | | 15. | 4.3 0.6 4.9 | 83 7 90 | 1806 | 9 19 7 | | 16. | 4.1 0.4 4.4 | 74 4 78 | 1494 | 11 22 11 | | 17. | 3.0 0.1 3.0 | 57 1 58 | 1263 | 11 23 10 | | 18. | 2.8 0.1 2.8 | 54 1 55 | 1382 | 11 25 12 | | 19. | 2.9 0.5 3.4 | 53 6 59 | 1212 | 12 28 12 | | 20. | 2.0 0.9 2.9 | 40 14 54 | 1077 | 12 29 14 | | 21. | 1.5 2.2 3.6 | 27 34 61 | 839 | 13 27 13 | | 22. | 0.9 2.5 3.4 | 21 48 69 | 1405 | 10 24 12 | | 23. | 0.8 1.9 2.7 | 17 43 60 | 1136 | 10 22 12 | | 24. | 0.7 1.7 2.5 | 15 35 50 | 912 | 12 22 12 | | 25. | 0.8 1.4 2.2 | 11 27 38 | 544 | 11 22 11 | | 26. | 1.3 2.0 3.3 | 18 33 51 | 513 | 9 23 10 | | 27. | 1.5 1.5 3.0 | 25 23 48 | 583 | 9 17 6 | | 28. | 1.3 1.5 2.7 | 21 22 43 | 508 | 11 23 10 | | 29. | 1.9 1.4 3.3 | 28 21 49 | 517 | 11 24 10 | | 30. | 2.4 1.5 3.9 | 35 22 57 | 467 | 10 23 10 | +------+----------------+-------------------+-------+--------------+ | Mean | 2.5 0.9 3.4 | 42.8 14.6 57.4 | 854 | 10 22 10 | +------+----------------+-------------------+-------+--------------+ | Days | 30 30 30 | 30 30 30 | 30 | | +------+----------------+-------------------+-------+--------------+ Based on 663 observations of 34 stations. Araujo,G. L 80 910 27 Junker,E. L 50 600 24 Barnes,H. L 76 910 8 Kaczmarek,A. L 80 400 10 Battaiola,R. S 901250 10 Michalovce Obs. L1502250 11 Beltran,G.V. S2001600 23 Moeller,M. L 791000 26 Bretschneider,H.L 63 840 25 Morales,G. S 902000 25 Bruegger,S. L 80 400 22 Noy,J.R. L 801200 6 Bullon,J.M. L1021000 23 Rim. Sobota Obs.L1502250 28 Bullon,J.M. S2002000 2 Robeck,G. S2032000 24 Chudy,M. L 60 700 29 Ruemmler,F. L 801200 22 Dubois,F. L1252500 27 Schott,G.-L. L 80 910 23 Fritsche,S. L 63 840 21 Schroeder,G. L 751200 27 Hedewig,R. L 801200 18 Smit,F. L 801200 26 Hesse,A. L1001000 10 Suzuki,M. L100 0 27 Hoerenz,M. L 60 700 13 Tiendesprong ObsL 751200 23 Holl,M. L 80 400 23 Van Slooten,B. L 901300 27 Hurbanovo Obs. L1502250 26 WFS,Berlin L1502250 14 Joppich,H. L 60 900 8 Willi,X. S2001320 5