Daily Sunspot Evaluation
Observation Sheet Tuesday, 27 February 1990
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)
- 13
- Number of spots (f)
- 84
- Relative number (R)
- 214
- Observer
- MB
- Reading
- counts consistent, some coordinates doubtful
- File
- 19900227.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 14 | 70W | 6 | 73W | - | 89 |
| 2 | EKC – 20 | 16 | 15W | 311 | 18W | 12.5 | 85 |
| 3 | DAC – 7 | 11 | 40E | 256 | 37E | 6 | 97 |
| 4 | ? – 5 | 29 | 62E | 234 | 59E | 6 | 100 |
| 5 | BXO – 3 | -3 | 65W | 1 | 68W | 6.5 | 88 |
| 6 | HS – 1 | -11 | 50W | 246 ⚠ | 53W | 2 | 77 |
| 7 | BRO – 4 | -38 | 32W | 328 | 35W | 9 | 81 |
| 8 | HS – 1 | -13 | 31W | 327 | 34W | 2 | 82 |
| 9 | DKC – 32 | -18 | 18W | 314 | 21W | 9 | 84 |
| 10 | AR – 1 | -24 | 10W | 306 | 13W | 0.5 | 58 |
| 11 | HA – 5 | -10 | 01W | 297 | 04W | 2 | 33 |
| 12 | HA – 3 | -18 | 29E | 267 | 26E | 3 | 95 |
| 13 | HS – 1 | -21 | 52E | 244 | 49E | 2.5 | 99 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.