Daily Sunspot Evaluation
Observation Sheet Friday, 28 August 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)
- 16
- Number of spots (f)
- 190
- Relative number (R)
- 350
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810828.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 7 | 12 | 75W | 310 | 78W | 10 | |
| 2 | DKI – 37 | 12 | 42W | 277 | 45W | 16 | |
| 3 | AXX – 2 | 2 | 8E | 227 | 0,5E | 1 | |
| 4 | EAI – 58 | 15 | 11E | 224 | 8E | 17 | |
| 5 | CKI – 15 | 15 | 32E | 203 | 29E | 17 | |
| 6 | DAO – 4 | 14 | 73E | 162 | 70E | 8 | |
| 7 | AXX – 1 | 19 | 80E | 155 | 77E | - | |
| 8 | EAXX – 1 | -3 | 64W | 289 ⚠ | 67W | 2 | |
| 9 | DKO – 26 | -10 | 50W | 285 | 53W | 10 | |
| 10 | AXX – 1 | -26 | 44W | 279 | 47W | - | |
| 11 | CAO – 5 | -9 | 36W | 271 | 39W | 5 | |
| 12 | AXX – 1 | -9 | 26W | 261 | 29W | - | |
| 13 | CAI – 12 | -5 | 16W | 251 | 19W | 4 | |
| 14 | AXX – 1 | -13 | 17E | 218 | 14E | - | |
| 15 | DKI – 18 | -13 | 60E | 175 | 57E | 10 | |
| 16 | ? – 1 | -18 | 80E | 155 | 77E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.