Daily Sunspot Evaluation
Observation Sheet Friday, 15 March 1991
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 10
- Number of spots (f)
- 98
- Relative number (R)
- 198
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19910315.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 15 | 58W | 5 | 60W | 1 | 104 |
| 2 | AR – 1 | 21 | 48E | 259 | 46E | 0.5 | 124 |
| 3 | AX – 1 | -7 | 56W | 3 | 58W | 0.5 | 118 |
| 4 | FAC – 52 | -25 | 33W | 340 | 35W | 30 | 303 |
| 5 | HA – 1 | -12 | 28W | 335 | 30W | 2 | 116 |
| 6 | DKC – 36 | -9 | 22E | 285 | 20E | 15 | 117 |
| 7 | HK – 1 | -23 | 32E | 275 | 30E | 3 | 119 |
| 8 | AR – 1 | -13 | 64E | 243 | 62E | 1 | 121 |
| 9 | ? – 1 | -2 | 79E | 228 | 77E | 4 | 122 |
| 10 | ? – 2 | -18 | 82E | 225 | 80E | 8 | 123 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.