Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 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)
- 50
- Relative number (R)
- 150
- Observer
- FA
- Reading
- all checks consistent
- File
- 19780418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 5 | 32 | 32E | 213 | 31E | ||
| 2 | A – 3 | 22 | 57E | 188 | 56E | ||
| 3 | ? – 1 | -18 | 78E | 167 | 77E | ||
| 4 | J – 1 | -29 | 55E | 190 | 54E | ||
| 5 | A – 10 | -28 | 42E | 203 | 41E | ||
| 6 | J – 1 | -44 | 00 | 245 | 01W | ||
| 7 | A – 2 | -21 | 43W | 288 | 44W | ||
| 8 | E – 19 | 13 | 51W | 296 | 52W | ||
| 9 | J – 1 | 19 | 67W | 312 | 68W | ||
| 10 | D – 7 | 17 | 35W | 280 | 36W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.