Daily Sunspot Evaluation
Observation Sheet Tuesday, 28 February 1978
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)
- 54
- Relative number (R)
- 144
- Observer
- GA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19780228.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 20 | 26E | 146 | 24E | ||
| 2 | J – 2 | -24 | 38E | 139 ⚠ | 31E | ||
| 3 | C – 15 | -27 | 15E | 157 | 13E | ||
| 4 | A – 2 | -20 | 11E | 161 | 09E | ||
| 5 | H – 2 | -21 | 13W | 185 | 15W | ||
| 6 | A – 2 | -16 | 14W | 186 | 16W | ||
| 7 | D – 10 | 17 | 59W | 231 | 61W | ||
| 8 | B – 5 | 22 | 47W | 219 | 49W | ||
| 9 | D – 14 | 37 | 21W | 193 | 23W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.