Daily Sunspot Evaluation
Observation Sheet Monday, 28 February 1972
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)
- 9
- Number of spots (f)
- 35
- Relative number (R)
- 125
- Observer
- FA
- Reading
- all checks consistent
- File
- 19720228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 4 | 9 | 10E | 295 | |||
| 2 | J – 1 | 21 | 41E | 264 | |||
| 3 | C – 12 | -7 | 49E | 256 | |||
| 4 | B – 5 | -10 | 15E | 290 | |||
| 5 | G – 8 | -17 | 38W | 343 | |||
| 6 | ? – 2 | 7 | 82W | 27 | |||
| 7 | A – 1 | 12 | 75W | 20 | |||
| 8 | A – 1 | 13 | 65W | 10 | |||
| 9 | A – 1 | 7 | 17W | 322 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.