Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 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)
- 9
- Number of spots (f)
- 90
- Relative number (R)
- 180
- Observer
- YK
- Reading
- all checks consistent
- File
- 19900515.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 18 | 72W | 71 | 74W | 0.5 | 188 |
| 2 | BRO – 5 | 16 | 21W | 20 | 23W | 4 | 195 |
| 3 | CAI – 18 | 23 | 09E | 350 | 07E | 10 | 198 |
| 4 | CAI – 12 | 28 | 28E | 331 | 26E | 11.5 | 201 |
| 5 | DKC – 17 | 35 | 41E | 318 | 39E | 7.5 | 202 |
| 6 | AX – 1 | -18 | 34W | 33 | 36W | - | 192 |
| 7 | AX – 3 | -18 | 20W | 19 | 22W | 1 | 203 |
| 8 | AX – 1 | -7 | 07E | 352 | 05E | - | 206 |
| 9 | EAC – 32 | -16 | 50E | 309 | 48E | 15 | 205 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.