Daily Sunspot Evaluation
Observation Sheet Thursday, 1 July 1971
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)
- 7
- Number of spots (f)
- 73
- Relative number (R)
- 143
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710701.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 17 | 27E | 230 | |||
| 2 | D – 7 | 7 | 08E | 249 | |||
| 3 | J – 5 | -10 | 51E | 206 | |||
| 4 | F – 38 | -13 | 30E | 227 | |||
| 5 | G – 7 | -7 | 17E | 240 | |||
| 6 | A – 2 | -10 | 21E | 236 | |||
| 7 | D – 13 | 15 | 39W | 296 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.