Daily Sunspot Evaluation
Observation Sheet Sunday, 28 June 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)
- 5
- Number of spots (f)
- 89
- Relative number (R)
- 139
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810628.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKC – 40 | 13 | 38W | 360 | 4W | 12 | |
| 2 | DRI – 14 | 19 | 20E | 302 | 17E | 7.5 | |
| 3 | HRX – 5 | 18 | 56E | 266 | 53E | 5.9 | |
| 4 | CAO – 4 | -11 | 11W | 333 | 14W | 4.5 | |
| 5 | FKC – 26 | -16 | 43E | 279 | 40E | 20 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.