Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 August 1974
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)
- 7
- Number of spots (f)
- 23
- Relative number (R)
- 93
- Observer
- FA
- Reading
- all checks consistent
- File
- 19740813.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 10 | 17E | 324 | |||
| 2 | A – 1 | 8 | 29E | 312 | |||
| 3 | D – 11 | -6 | 01E | 340 | |||
| 4 | B – 4 | -18 | 04E | 337 | |||
| 5 | A – 2 | -19 | 08W | 349 | |||
| 6 | J – 2 | -7 | 27W | 8 | |||
| 7 | J – 1 | -8 | 38W | 19 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.