Daily Sunspot Evaluation
Observation Sheet Thursday, 18 May 1989
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)
- 12
- Number of spots (f)
- 104
- Relative number (R)
- 224
- Observer
- YK
- Reading
- all checks consistent
- File
- 19890518.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 8 | 9 | 45W | 143 | +8W | 6.5 | |
| 2 | EAI – 18 | 18 | 18W | 116 | 21W | 13 | |
| 3 | BXI – 12 | 17 | 04W | 102 | 07W | 6.5 | |
| 4 | ESC – 28 | 16 | 11E | 87 | 08E | 11.5 | |
| 5 | BXO – 5 | 23 | 15E | 83 | 12E | 4 | |
| 6 | BRO – 6 | 14 | 26E | 72 | 23E | 3 | |
| 7 | EAI – 7 | -21 | 63W | 161 | 66W | 11.5 | |
| 8 | HS – 1 | -9 | 24W | 122 | 27W | 1 | |
| 9 | BXI – 14 | -17 | 26E | 72 | 23E | 7 | |
| 10 | HS – 1 | -27 | 41E | 57 | 38E | 2.5 | |
| 11 | HA – 3 | -18 | 55E | 43 | 52E | 2 | |
| 12 | AX – 1 | -21 | 69E | 29 | 66E | 0.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.