Daily Sunspot Evaluation
Observation Sheet Thursday, 17 January 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)
- 6
- Number of spots (f)
- 20
- Relative number (R)
- 80
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19740117.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 8 | -15 | 37E | 172 | |||
| 2 | G – 2 | -13 | 14E | 135 ⚠ | |||
| 3 | J – 1 | -17 | 03W | 218 ⚠ | |||
| 4 | J – 2 | -13 | 37W | 246 | |||
| 5 | A – 3 | 8 | 54W | 263 | |||
| 6 | B – 4 | 15 | 15W | 224 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.