Daily Sunspot Evaluation
Observation Sheet Thursday, 17 March 1983
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)
- 4
- Number of spots (f)
- 31
- Relative number (R)
- 71
- Observer
- TÖ
- Reading
- counts consistent, some coordinates doubtful
- File
- 19830317.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRO – 3 | 20 | 33W | 9 ⚠ | 35W | 7.5 | 66 |
| 2 | DKC – 15 | -13 | 22E | 305 | 20E | 7.5 | 64 |
| 3 | DKI – 12 | -7 | 46E | 281 | 44E | 12.5 | 65 |
| 4 | HRX – 1 | -12 | 57E | 270 | 55E | 1 | 67 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.