Daily Sunspot Evaluation
Observation Sheet Thursday, 13 March 1969
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)
- 8
- Number of spots (f)
- 29
- Relative number (R)
- 109
- Observer
- SM
- Reading
- all checks consistent
- File
- 19690313.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 6 | 31 | 08E | 179 | |||
| 2 | A – 2 | 23 | 39E | 148 | |||
| 3 | ? – 4 | 15 | 88E | 99 | |||
| 4 | H – 4 | -11 | 14E | 173 | |||
| 5 | D – 3 | -16 | 58E | 129 | |||
| 6 | ? – 3 | 12 | 78W | 265 | |||
| 7 | J – 3 | 8 | 15W | 202 | |||
| 8 | J – 4 | 19 | 24W | 211 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.