Daily Sunspot Evaluation
Observation Sheet Friday, 19 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)
- 13
- Relative number (R)
- 63
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710319.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | -9 | 64E | 127 | |||
| 2 | J – 1 | -19 | 72W | 263 | |||
| 3 | D – 8 | -6 | 48W | 239 | |||
| 4 | J – 2 | -5 | 25W | 216 | |||
| 5 | J – 1 | 18 | 50W | 241 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.