Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 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
- MA
- Reading
- all checks consistent
- File
- 19710317.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 6 | 7 | 06E | 211 | |||
| 2 | H – 3 | -4 | 03E | 214 | |||
| 3 | A – 1 | 1 | 05E | 212 | |||
| 4 | H – 1 | -18 | 45W | 262 | |||
| 5 | A – 3 | -12 | 26W | 243 | |||
| 6 | C – 21 | -6 | 20W | 237 | |||
| 7 | J – 3 | 19 | 23W | 240 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.