Provisional sunspot numbers September 1997 +------+----------------+-------------------+-------+--------------+ | | | | | | | Day | Groups | Wolf number | Beck | No. of Obs. | | | | | index | | | | N S Total | N S Total | | N/S T Beck | | | | | | | +------+----------------+-------------------+-------+--------------+ | 1. | 2.5 0.2 2.6 | 46 2 48 | 936 | 6 12 4 | | 2. | 2.2 0.1 2.3 | 42 1 44 | 915 | 4 8 3 | | 3. | 1.5 0.7 2.2 | 29 11 40 | 642 | 2 6 3 | | 4. | 1.4 0.7 2.2 | 20 13 33 | 439 | 2 7 2 | | 5. | 1.5 0.6 2.1 | 22 15 36 | 521 | 4 10 3 | | 6. | 1.9 0.7 2.6 | 26 16 43 | 349 | 2 5 2 | | 7. | 1.7 1.7 3.4 | 25 32 57 | 721 | 2 9 3 | | 8. | 1.8 1.8 3.6 | 31 41 72 | 1018 | 3 10 3 | | 9. | 1.9 1.9 3.7 | 27 55 83 | 1340 | 1 9 3 | | 10. | 1.0 1.9 2.9 | 24 53 77 | 1809 | 3 9 5 | | 11. | 1.1 1.8 2.9 | 28 48 76 | 1876 | 5 11 5 | | 12. | 1.2 1.7 2.9 | 27 44 71 | 1734 | 2 10 4 | | 13. | 1.8 1.8 3.7 | 37 36 73 | 1537 | 1 5 1 | | 14. | 1.9 1.9 3.8 | 32 32 64 | 1299 | 3 10 3 | | 15. | 1.7 1.1 2.8 | 40 16 57 | 1065 | 4 10 5 | | 16. | 1.8 0.8 2.7 | 40 12 52 | 1104 | 4 9 5 | | 17. | 1.4 0.9 2.3 | 25 12 37 | 509 | 3 8 5 | | 18. | 0.9 0.7 1.6 | 18 9 26 | 271 | 4 9 5 | | 19. | 0.9 0.0 0.9 | 15 0 15 | 99 | 4 9 4 | | 20. | 0.8 0.0 0.8 | 13 0 13 | 158 | 4 11 5 | | 21. | 0.9 0.7 1.6 | 14 8 22 | 160 | 6 15 6 | | 22. | 0.8 1.6 2.3 | 10 28 39 | 326 | 6 14 5 | | 23. | 0.5 1.5 2.0 | 5 31 36 | 524 | 5 11 5 | | 24. | 0.2 1.5 1.7 | 2 34 36 | 803 | 4 10 5 | | 25. | 0.0 2.1 2.1 | 0 42 42 | 876 | 5 11 4 | | 26. | 0.2 1.1 1.3 | 2 22 24 | 514 | 6 14 6 | | 27. | 0.0 0.9 0.9 | 0 20 20 | 409 | 2 6 5 | | 28. | 0.0 0.8 0.8 | 0 14 14 | 187 | 6 15 6 | | 29. | 0.1 0.8 0.9 | 1 12 13 | 131 | 5 13 6 | | 30. | 0.0 0.8 0.8 | 0 10 10 | 26 | 1 2 2 | +------+----------------+-------------------+-------+--------------+ | Mean | 1.1 1.1 2.2 | 20.0 22.3 42.4 | 743 | 4 10 4 | +------+----------------+-------------------+-------+--------------+ | Days | 30 30 30 | 30 30 30 | 30 | | +------+----------------+-------------------+-------+--------------+ Based on 288 observations of 16 stations. Edited by Martin Dillig