Provisional sunspot numbers April 1998 +------+----------------+-------------------+-------+--------------+ | | | | | | | Day | Groups | Wolf number | Beck | No. of Obs. | | | | | index | | | | N S Total | N S Total | | N/S T Beck | | | | | | | +------+----------------+-------------------+-------+--------------+ | 1. | 0.2 2.5 2.7 | 3 47 50 | 736 | 3 7 1 | | 2. | 0.0 3.2 3.2 | 0 50 50 | 614 | 4 9 2 | | 3. | 0.0 2.5 2.5 | 0 43 43 | 757 | 3 6 1 | | 4. | 0.0 2.7 2.7 | 0 45 45 | 275 | 4 8 2 | | 5. | 0.1 3.0 3.1 | 1 50 51 | 466 | 8 16 5 | | 6. | 0.0 3.5 3.5 | 0 59 59 | 575 | 4 10 2 | | 7. | 1.0 4.1 5.1 | 13 70 84 | - | 2 4 0 | | 8. | 1.1 4.2 5.3 | 13 74 87 | 823 | 3 6 2 | | 9. | 1.1 5.8 6.9 | 12 101 113 | 1057 | 4 9 3 | | 10. | 0.4 5.7 6.2 | 4 93 98 | 870 | 4 10 3 | | 11. | 0.0 5.5 5.5 | 0 86 86 | 754 | 6 11 3 | | 12. | 0.0 5.0 5.0 | 0 72 72 | 262 | 4 9 1 | | 13. | 0.1 4.3 4.4 | 1 60 61 | 320 | 8 18 7 | | 14. | 0.5 3.5 4.0 | 6 51 57 | 283 | 5 15 4 | | 15. | 0.5 2.8 3.4 | 12 40 52 | 408 | 2 6 2 | | 16. | 0.9 2.5 3.4 | 17 34 51 | 282 | 6 10 2 | | 17. | 1.0 1.4 2.4 | 13 16 29 | 71 | 5 11 3 | | 18. | 0.6 0.6 1.3 | 13 8 21 | 99 | 1 5 1 | | 19. | 1.4 0.0 1.4 | 26 0 26 | 322 | 6 13 5 | | 20. | 1.3 0.0 1.3 | 26 0 26 | 280 | 9 16 5 | | 21. | 1.3 0.2 1.4 | 24 2 26 | 349 | 4 10 2 | | 22. | 1.4 0.1 1.5 | 21 1 22 | 232 | 8 18 6 | | 23. | 1.0 0.5 1.5 | 14 6 20 | 103 | 8 19 6 | | 24. | 0.4 0.5 0.9 | 5 6 11 | 37 | 2 11 4 | | 25. | 0.3 0.7 1.0 | 3 10 13 | 68 | 4 9 3 | | 26. | 0.0 0.9 0.9 | 0 12 12 | 222 | 3 4 1 | | 27. | 0.1 0.7 0.9 | 1 10 11 | 52 | 4 10 3 | | 28. | 0.0 1.4 1.4 | 0 21 21 | 69 | 2 4 1 | | 29. | 0.1 1.4 1.5 | 1 25 26 | 268 | 4 9 2 | | 30. | 0.9 1.3 2.2 | 14 22 36 | 326 | 6 14 4 | +------+----------------+-------------------+-------+--------------+ | Mean | 0.5 2.4 2.9 | 8.1 37.1 45.3 | 379 | 5 10 3 | +------+----------------+-------------------+-------+--------------+ | Days | 30 30 30 | 30 30 30 | 29 | | +------+----------------+-------------------+-------+--------------+ Based on 307 observations of 22 stations. Edited by Martin Dillig