Daily Sunspot Evaluation
Observation Sheet Monday, 16 February 1981
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)
- 104
- Relative number (R)
- 174
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19810216,.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HSX – 1 | 23 | 79W | 343 | 8W | 2 | |
| 2 | FKC – 18 | 12 | 71W | 335 | 32W | 19 | |
| 3 | RAJ – 45 | 19 | 03E | 261 | 01E | 13 | |
| 4 | HKX – 1 | 11 | 04E | 260 | 02E | 25 | |
| 5 | CAI – 7 | 12 | 16E | 248 | 14E | 4 | |
| 6 | CKO – 11 | 15 | 29E | 235 | 27E | 10 | |
| 7 | DKC – 21 | -20 | 09E | 255 | 07E | 6.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.