Daily Sunspot Evaluation
Observation Sheet Thursday, 2 April 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)
- 11
- Number of spots (f)
- 42
- Relative number (R)
- 152
- Observer
- TÖ
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810402.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRO – 4 | 18 | 10W | 41 | 11W | 6.25 | |
| 2 | DRO – 8 | 13 | 08W | 23 ⚠ | 07E | 4 | |
| 3 | DRC – 11 | 27 | 08E | 23 | 07E | 7.75 | |
| 4 | AXX – 2 | 5 | 11E | 20 | 10E | 0.75 | |
| 5 | CHO – 4 | 18 | 45E | 346 | 44E | 3.75 | |
| 6 | CAO – 2 | 6 | 60E | 331 | 59E | 3 | |
| 7 | HAX – 1 | 9 | 76E | 315 | 75E | 3 | |
| 8 | HXC – 7 | -43 | 67W | 98 | 68W | 10 | |
| 9 | HSX – 1 | -11 | 39W | 70 | 40W | 15 | |
| 10 | AXX – 1 | -9 | 03E | 28 | 01E | - | |
| 11 | HAX – 1 | -3 | 18E | 13 | 17E | 1 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.