Daily Sunspot Evaluation
Observation Sheet Sunday, 15 September 1974
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)
- 4
- Number of spots (f)
- 44
- Relative number (R)
- 84
- Observer
- HM
- Reading
- all checks consistent
- File
- 19740915.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 21 | 9 | 00 | 266 | |||
| 2 | ? – 1 | 9 | 85E | 181 | |||
| 3 | J – 3 | -16 | 12E | 254 | |||
| 4 | C – 19 | -13 | 01E | 265 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.