Table 6‑3: Reference fixed index values
|
|
Long-term (27+ days) |
Short-term (daily) |
||||
|
|
Low |
Moderate |
High |
Low |
Moderate |
High |
|
F10.7 |
65 |
140 |
250 |
65 |
140 |
300 |
|
S10.7 |
60 |
125 |
220 |
60 |
125 |
235 |
|
M10.7 |
60 |
125 |
220 |
60 |
125 |
240 |
|
Ap |
0 |
15 |
45 |
0 |
15 |
240 |
|
NOTE 1 The reference index values are rounded numbers from the last solar cycle 23. NOTE 2 Low, moderate or high values for Ap can occur at any time in the solar cycle. NOTE 3 For short terms, higher values than those given in this table have been measured (e.g. F10.7 = 380 over a day and ap= 400 for 3 hours). However, present atmosphere models are not developed for such high index values and its use leads to large and unknown errors. |
||||||
Table 6‑4: Reference index values for variations of ap
|
Time [hrs] |
ap |
|
0 |
15 |
|
3 |
15 |
|
6 |
300 |
|
9 |
130 |
|
12 |
50 |
|
15 |
15 |
|
18 |
15 |
|
21 |
15 |
|
24 |
15 |