Daily Sunspot Evaluation
Observation Sheet Monday, 15 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)
- 7
- Number of spots (f)
- 38
- Relative number (R)
- 108
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710315.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 6 | 19 | 03E | 241 | |||
| 2 | A – 1 | 19 | 34E | 210 | |||
| 3 | D – 11 | 8 | 33E | 211 | |||
| 4 | J – 1 | -4 | 29E | 215 | |||
| 5 | D – 8 | -16 | 19W | 265 | |||
| 6 | B – 10 | -12 | 37W | 281 | |||
| 7 | A – 1 | -8 | 58W | 302 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.