Daily Sunspot Evaluation
Observation Sheet Sunday, 13 February 1977
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)
- 5
- Number of spots (f)
- 51
- Relative number (R)
- 101
- Observer
- HM
- Reading
- all checks consistent
- File
- 19770213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 6 | 23 | 09E | 138 | 07E | ||
| 2 | D – 10 | 2 | 08E | 139 | 06E | ||
| 3 | E – 31 | -42 | 14W | 161 | 16W | ||
| 4 | A – 2 | 15 | 48W | 195 | 50W | ||
| 5 | A – 2 | 21 | 13W | 160 | 15W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.