Daily Sunspot Evaluation
Observation Sheet Sunday, 15 March 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)
- 7
- Number of spots (f)
- 91
- Relative number (R)
- 161
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810315.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HKX – 1 | 25 | 67W | 337 | 70W | ||
| 2 | FKC – 43 | 8 | 48W | 318 | 51W | ||
| 3 | RXX – 2 | 7 | 01E | 269 | 02W | ||
| 4 | HKX – 2 | 8 | 65E | 205 | 62E | ||
| 5 | CRI – 14 | -16 | 14W | 284 | 17W | ||
| 6 | DSI – 22 | -5 | 03W | 273 | 06W | ||
| 7 | CAO – 7 | -21 | 10E | 260 | 07E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.