Provisional sunspot numbers April 2000 +------+----------------+-------------------+-------+--------------+ | | | | | | | Day | Groups | Wolf number | Beck | No. of Obs. | | | | | index | | | | N S Total | N S Total | | N/S T Beck | | | | | | | +------+----------------+-------------------+-------+--------------+ | 1. | 4.7 6.8 11.5 | 80 123 203 | 1877 | 7 12 5 | | 2. | 5.1 7.0 12.2 | 89 135 224 | 2506 | 7 15 4 | | 3. | 4.4 6.4 10.8 | 80 114 194 | 2399 | 8 15 3 | | 4. | 4.5 6.0 10.6 | 74 104 178 | 1626 | 7 13 4 | | 5. | 3.6 5.9 9.5 | 55 96 151 | 1508 | 3 8 2 | | 6. | 2.8 5.1 7.9 | 38 81 118 | 974 | 8 15 5 | | 7. | 2.5 4.6 7.1 | 34 73 107 | 852 | 7 16 5 | | 8. | 2.3 4.6 6.9 | 31 80 111 | 1276 | 6 11 3 | | 9. | 2.5 4.7 7.1 | 29 79 108 | 1120 | 11 19 6 | | 10. | 2.7 4.2 7.0 | 32 75 107 | 1162 | 9 16 5 | | 11. | 2.4 4.0 6.4 | 30 68 98 | 688 | 6 13 3 | | 12. | 2.9 4.2 7.1 | 39 77 116 | 930 | 7 11 4 | | 13. | 3.8 4.5 8.3 | 48 72 120 | 988 | 7 13 4 | | 14. | 4.5 4.2 8.7 | 61 64 125 | 877 | 7 10 4 | | 15. | 3.9 3.9 7.7 | 56 62 118 | 1001 | 6 12 3 | | 16. | 3.9 3.1 7.0 | 55 50 104 | 955 | 10 16 5 | | 17. | 4.5 4.0 8.5 | 62 58 120 | 785 | 7 10 3 | | 18. | 3.3 3.6 6.9 | 50 49 99 | 725 | 4 8 2 | | 19. | 4.1 2.9 7.0 | 61 41 102 | 643 | 3 7 2 | | 20. | 4.9 3.5 8.4 | 70 51 121 | 1130 | 9 17 5 | | 21. | 5.8 3.5 9.3 | 88 58 146 | 1746 | 9 17 6 | | 22. | 5.6 3.8 9.4 | 92 65 156 | 1985 | 8 15 4 | | 23. | 5.3 3.9 9.3 | 101 74 174 | 3411 | 8 15 5 | | 24. | 4.3 5.0 9.4 | 97 85 182 | 4158 | 2 5 2 | | 25. | 4.6 3.0 7.6 | 95 70 165 | 3589 | 10 17 7 | | 26. | 4.2 3.2 7.4 | 73 67 140 | 2400 | 11 19 6 | | 27. | 3.8 2.0 5.8 | 58 46 104 | 2073 | 7 14 5 | | 28. | 3.5 3.7 7.2 | 49 71 121 | 1712 | 5 8 4 | | 29. | 2.5 3.3 5.8 | 42 70 112 | 2011 | 7 13 4 | | 30. | 2.3 3.2 5.5 | 35 63 98 | 1603 | 5 9 4 | +------+----------------+-------------------+-------+--------------+ | Mean | 3.8 4.3 8.1 | 60.1 74.0 134.1 | 1624 | 7 13 4 | +------+----------------+-------------------+-------+--------------+ | Days | 30 30 30 | 30 30 30 | 30 | | +------+----------------+-------------------+-------+--------------+ Based on 389 observations of 22 stations. Edited by Martin Dillig.