Daily Sunspot Evaluation
Observation Sheet Thursday, 17 May 1990
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)
- 5
- Number of spots (f)
- 94
- Relative number (R)
- 144
- Observer
- MB
- Reading
- all checks consistent
- File
- 19900517.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ESC – 12 | 23 | 20W | 350 | 20W | 11.5 | 1098 |
| 2 | CAO – 6 | 28 | 01W | 331 | 01W | 12 | 201 |
| 3 | DKC – 22 | 35 | 12E | 318 | 12E | 8.5 | 202 |
| 4 | AR – 1 | 8 | 67E | 263 | 66E | 1 | 207 |
| 5 | FKC – 53 | -16 | 21E | 309 | 21E | 15.5 | 205 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.