Daily Sunspot Evaluation
Observation Sheet Sunday, 28 February 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)
- 8
- Number of spots (f)
- 46
- Relative number (R)
- 126
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 13 | 7 | 09E | 73 | |||
| 2 | J – 1 | 25 | 35E | 47 | |||
| 3 | H – 8 | 8 | 50E | 32 | |||
| 4 | G – 6 | -18 | 58W | 140 | |||
| 5 | B – 2 | -13 | 26W | 108 | |||
| 6 | J – 1 | -10 | 26W | 108 | |||
| 7 | H – 9 | -8 | 45W | 127 | |||
| 8 | A – 6 | 1 | 33W | 115 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.