Daily Sunspot Evaluation
Observation Sheet Monday, 4 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)
- 14
- Number of spots (f)
- 89
- Relative number (R)
- 229
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810504.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 1 | 16 | 63W | 33 | 66W | 1.5 | |
| 2 | HAX – 1 | 4 | 52W | 22 | 55W | 2 | |
| 3 | HSX – 1 | 20 | 10W | 340 | 13W | 2.5 | |
| 4 | AXX – 1 | 19 | 02W | 332 | 05W | - | |
| 5 | DRI – 33 | 6 | 13E | 317 | 10E | 12 | |
| 6 | HKI – 20 | 15 | 16E | 314 | 13E | 10 | |
| 7 | BXO – 3 | 5 | 23E | 307 | 20E | 2.5 | |
| 8 | AXX – 1 | 18 | 27E | 303 | 24E | - | |
| 9 | BXO – 4 | 10 | 29E | 301 | 26E | 2.5 | |
| 10 | CRI – 8 | 10 | 39E | 291 | 36E | 5 | |
| 11 | AXX – 1 | 16 | 41E | 289 | 38E | - | |
| 12 | CAO – 9 | -7 | 05W | 335 | 08W | 6.5 | |
| 13 | AXX – 1 | -11 | 41E | 289 | 38E | - | |
| 14 | CRO – 5 | -21 | 61E | 269 | 58E | 8 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.