Daily Sunspot Evaluation
Observation Sheet Thursday, 15 February 1973
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)
- 34
- Relative number (R)
- 104
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19730215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 9 | -9 | 38E | 287 | 27 | ||
| 2 | D – 11 | -17 | 19E | 306 | 25 | ||
| 3 | A – 1 | -4 | 10W | 335 | 24 | ||
| 4 | J – 1 | 7 | 50W | 15 | 22 | ||
| 5 | A – 1 | 11 | 68W | 33 | 28 | ||
| 6 | D – 8 | 15 | 67W | ⚠ | 32E | 23 | |
| 7 | J – 3 | 11 | 51W | 16 | 20 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.