Daily Sunspot Evaluation
Observation Sheet Monday, 21 September 1970
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)
- 13
- Number of spots (f)
- 101
- Relative number (R)
- 231
- Observer
- HA
- Reading
- all checks consistent
- File
- 19700921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 36 | 20 | 10E | 21 | |||
| 2 | J – 1 | 13 | 47E | 344 | |||
| 3 | C – 6 | 12 | 68E | 323 | |||
| 4 | A – 1 | 1 | 59E | 332 | |||
| 5 | C – 8 | 3 | 33E | 358 | |||
| 6 | A – 6 | 5 | 02E | 29 | |||
| 7 | A – 4 | -17 | 06W | 37 | |||
| 8 | B – 4 | -15 | 09W | 40 | |||
| 9 | A – 2 | -19 | 12W | 43 | |||
| 10 | A – 1 | -24 | 56W | 87 | |||
| 11 | C – 8 | -15 | 67W | 98 | |||
| 12 | J – 1 | 12 | 76W | 107 | |||
| 13 | E – 23 | 22 | 34W | 65 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.