Daily Sunspot Evaluation
Observation Sheet Sunday, 7 March 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)
- 5
- Number of spots (f)
- 15
- Relative number (R)
- 65
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710307.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | -17 | 84E | 266 | |||
| 2 | A – 10 | -12 | 09E | 341 | |||
| 3 | J – 1 | -15 | 72W | 62 | |||
| 4 | J – 2 | 8 | 45W | 35 | |||
| 5 | J – 1 | 25 | 56W | 46 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.