Provisional sunspot numbers April 1999 +------+----------------+-------------------+-------+--------------+ | | | | | | | Day | Groups | Wolf number | Beck | No. of Obs. | | | | | index | | | | N S Total | N S Total | | N/S T Beck | | | | | | | +------+----------------+-------------------+-------+--------------+ | 1. | 2.2 1.5 3.7 | 24 19 43 | 292 | 11 16 8 | | 2. | 1.6 1.4 3.0 | 17 19 36 | 247 | 12 17 8 | | 3. | 1.8 1.4 3.2 | 22 25 47 | 445 | 10 13 7 | | 4. | 2.0 1.4 3.4 | 32 40 72 | 901 | 7 9 6 | | 5. | 1.8 2.3 4.1 | 38 49 86 | 1147 | 7 10 6 | | 6. | 1.5 2.9 4.4 | 38 61 99 | 1616 | 5 8 3 | | 7. | 1.5 2.6 4.1 | 40 41 81 | 1272 | 4 5 3 | | 8. | 1.6 2.8 4.4 | 43 34 77 | 963 | 3 5 2 | | 9. | 1.9 3.5 5.4 | 49 48 97 | 1153 | 8 12 6 | | 10. | 1.9 2.4 4.2 | 54 44 98 | 1592 | 8 12 8 | | 11. | 1.7 2.3 4.0 | 37 39 75 | 1130 | 7 8 4 | | 12. | 1.2 3.1 4.4 | 23 59 82 | 643 | 6 7 3 | | 13. | 0.9 3.8 4.6 | 11 65 76 | 513 | 11 13 6 | | 14. | 0.3 4.1 4.4 | 3 59 63 | 335 | 7 8 4 | | 15. | 0.2 4.2 4.4 | 2 63 65 | 270 | 6 7 3 | | 16. | 0.8 4.2 5.0 | 9 64 73 | 322 | 5 6 3 | | 17. | 1.7 4.2 5.9 | 21 61 82 | 474 | 2 5 3 | | 18. | 0.7 3.1 3.8 | 11 39 50 | 250 | 6 10 6 | | 19. | 1.6 1.5 3.2 | 24 25 49 | 220 | 9 12 5 | | 20. | 1.8 1.5 3.3 | 23 30 53 | 407 | 12 16 7 | | 21. | 1.1 1.5 2.5 | 12 27 39 | 318 | 7 8 5 | | 22. | 0.8 1.6 2.4 | 12 31 43 | 314 | 8 10 5 | | 23. | 1.4 1.6 3.0 | 15 33 49 | 392 | 8 11 5 | | 24. | 1.5 1.4 2.8 | 18 26 43 | 248 | 9 11 4 | | 25. | 2.0 0.8 2.8 | 33 12 44 | 476 | 8 12 5 | | 26. | 2.3 0.8 3.1 | 42 10 52 | 532 | 8 12 7 | | 27. | 2.3 0.7 3.0 | 47 8 55 | 660 | 7 10 5 | | 28. | 2.2 0.7 2.9 | 49 8 57 | 706 | 10 12 5 | | 29. | 3.3 0.4 3.7 | 58 4 63 | 796 | 13 16 8 | | 30. | 3.3 0.0 3.3 | 69 0 69 | 1410 | 12 16 8 | +------+----------------+-------------------+-------+--------------+ | Mean | 1.6 2.1 3.7 | 29.2 34.8 63.9 | 668 | 8 11 5 | +------+----------------+-------------------+-------+--------------+ | Days | 30 30 30 | 30 30 30 | 30 | | +------+----------------+-------------------+-------+--------------+ Based on 317 observations of 18 stations. Edited by Martin Dillig