Daily Sunspot Evaluation
Observation Sheet Monday, 17 April 1978
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)
- 10
- Number of spots (f)
- 47
- Relative number (R)
- 147
- Observer
- FA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19780417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 5 | 32 | 45E | 214 | 43E | ||
| 2 | A – 1 | 17 | 49E | 210 | 47E | ||
| 3 | J – 1 | -28 | 68E | 191 | 66E | ||
| 4 | A – 2 | -31 | 58E | 201 | 56E | ||
| 5 | J – 1 | -43 | 13E | 216 ⚠ | 11E | ||
| 6 | J – 1 | -20 | 30W | 289 | 32W | ||
| 7 | A – 3 | 16 | 73W | 332 | 75W | v | |
| 8 | D – 20 | 3 | 36W | 285 ⚠ | 38W | ||
| 9 | C – 3 | 19 | 48W | 307 | 50W | ||
| 10 | D – 10 | 18 | 20W | 279 | 22W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.