Daily Sunspot Evaluation
Observation Sheet Sunday, 17 September 1972
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)
- 5
- Number of spots (f)
- 25
- Relative number (R)
- 75
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 9 | 7 | 02E | 153 | |||
| 2 | J – 1 | -15 | 75E | 80 | |||
| 3 | A – 1 | -11 | 41E | 114 | |||
| 4 | C – 10 | -9 | 08W | 163 | |||
| 5 | J – 4 | -12 | 33W | 188 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.