Daily Sunspot Evaluation
Observation Sheet Thursday, 18 May 1972
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)
- 8
- Number of spots (f)
- 71
- Relative number (R)
- 151
- Observer
- ED
- Reading
- counts consistent, some coordinates doubtful
- File
- 19720518.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 13 | 14 | 30E | 298 | |||
| 2 | B – 2 | 8 | 13E | 303 ⚠ | |||
| 3 | F – 23 | -13 | 31E | 297 | |||
| 4 | D – 12 | -5 | 03W | 331 | |||
| 5 | J – 1 | -9 | 07E | 321 | |||
| 6 | J – 3 | -12 | 15W | 343 | |||
| 7 | D – 16 | 7 | 41W | 9 | |||
| 8 | A – 1 | 12 | 19W | 349 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.