Daily Sunspot Evaluation
Observation Sheet Thursday, 18 June 1970
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)
- 107
- Relative number (R)
- 187
- Observer
- FA
- Reading
- all checks consistent
- File
- 19700618.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 20 | 45E | 162 | |||
| 2 | ? – 1 | 18 | 80E | 127 | |||
| 3 | J – 1 | -5 | 64E | 143 | |||
| 4 | A – 3 | -14 | 52E | 155 | |||
| 5 | C – 8 | -12 | 26E | 181 | |||
| 6 | E – 18 | 16 | 58W | 265 | |||
| 7 | C – 8 | 15 | 34W | 241 | |||
| 8 | F – 67 | 17 | 12W | 219 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.