Daily Sunspot Evaluation
Observation Sheet Monday, 15 April 1968
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)
- 9
- Number of spots (f)
- 46
- Relative number (R)
- 136
- Observer
- AT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19680415.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 31 | 22E | 227 | |||
| 2 | J – 1 | 25 | 21E | 178 ⚠ | |||
| 3 | J – 1 | -12 | 20E | 179 ⚠ | |||
| 4 | C – 5 | -24 | 42E | 187 ⚠ | |||
| 5 | D – 11 | -13 | 31W | 280 | |||
| 6 | J – 1 | 23 | 87W | 336 | |||
| 7 | A – 6 | 21 | 62W | 311 | |||
| 8 | J – 4 | 23 | 36W | 285 | |||
| 9 | E – 16 | 24 | 1W | 250 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.