Open Access
Table 2.
Long term solar activity data
| No | Year | SSN | Annual Ap mean | Annual Dst mean (absolute value) | Annual no. of days with Ap ≥ 40 | Annual no. of days with Dst ≤ −40 |
|---|---|---|---|---|---|---|
| 1 | 1989 | 1893 | 19 | 30 | 38 | 106 |
| 2 | 1990 | 1707 | 16 | 21 | 23 | 68 |
| 3 | 1991 | 1749 | 23 | 31 | 54 | 112 |
| 4 | 1992 | 1134 | 16 | 26 | 23 | 76 |
| 5 | 1993 | 657 | 15 | 19 | 19 | 38 |
| 6 | 1994 | 358 | 18 | 23 | 39 | 65 |
| 7 | 1995 | 210 | 13 | 17 | 10 | 35 |
| 8 | 1996 | 103 | 9 | 11 | 0 | 2 |
| 9 | 1997 | 258 | 8 | 14 | 5 | 20 |
| 10 | 1998 | 770 | 12 | 17 | 16 | 38 |
| 11 | 1999 | 1118 | 13 | 13 | 12 | 35 |
| 12 | 2000 | 1434 | 15 | 19 | 23 | 43 |
| 13 | 2001 | 1331 | 13 | 18 | 19 | 43 |
| 14 | 2002 | 1249 | 13 | 21 | 17 | 64 |
| 15 | 2003 | 763 | 22 | 22 | 35 | 43 |
| 16 | 2004 | 485 | 13 | 12 | 14 | 22 |
| 17 | 2005 | 357 | 13 | 16 | 21 | 40 |
| 18 | 2006 | 182 | 8 | 12 | 4 | 14 |
| 19 | 2007 | 90 | 7 | 8 | 0 | 0 |
| 20 | 2008 | 34 | 7 | 8 | 0 | 2 |
| 21 | 2009 | 37 | 4 | 3 (provisional) | 0 | 1 (provisional) |
| 22 | 2010 | 198 | 6 | 6 (provisional) | 3 | 4 (provisional) |
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