Daily Sunspot Evaluation
Observation Sheet Friday, 1 May 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)
- 9
- Number of spots (f)
- 61
- Relative number (R)
- 151
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810501.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 4 | 16 | 22W | 31 | 25W | 2 | |
| 2 | CAO – 5 | 25 | 17W | 26 | 20W | 4 | |
| 3 | CAI – 18 | 15 | 16W | 25 | 19W | 13.5 | |
| 4 | BRO – 3 | 12 | 07E | 2 | 04E | 3 | |
| 5 | HSX – 1 | 20 | 28E | 339 | 25E | 2.5 | |
| 6 | CAI – 7 | 7 | 53E | 316 | 50E | 9 | |
| 7 | CAI – 14 | 15 | 57E | 312 | 54E | 8 | |
| 8 | HAX – 2 | 4 | 64E | 305 | 61E | 3 | |
| 9 | CAI – 7 | -8 | 36E | 333 | 33E | 6.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.