Daily Sunspot Evaluation
Observation Sheet Friday, 28 September 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)
- 40
- Relative number (R)
- 110
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730928.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 21 | 33°E | 199 | 484 | ||
| 2 | J – 1 | 12 | 67°E | 165 | 488 | ||
| 3 | C – 14 | -14 | 60°E | 172 | 489 | ||
| 4 | J – 2 | -17 | 40°E | 192 | 486 | ||
| 5 | J – 5 | 6 | 28°W | 260 | 476 | ||
| 6 | A – 1 | 9 | 25°W | 257 | 485 | ||
| 7 | E – 15 | 14 | 21°W | 253 | 475 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.