Daily Sunspot Evaluation
Observation Sheet Thursday, 13 August 1998
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)
- 10
- Number of spots (f)
- 71
- Relative number (R)
- 171
- Observer
- NA
- Reading
- all checks consistent
- File
- 19980813.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXO – 9 | 19 | 55W | 257 | 58W | 6.5 | 168 |
| 2 | BXO – 3 | 17 | 24W | 226 | 27W | 5.5 | 165 |
| 3 | AX – 1 | 22 | 16W | 218 | 19W | - | 123 |
| 4 | DHO – 8 | 30 | 06W | 208 | 09W | 5.5 | 166 |
| 5 | BXI – 9 | 27 | 03E | 199 | 00 | 4.5 | 124 |
| 6 | DKC – 16 | 15 | 08E | 194 | 05E | 7.5 | 169 |
| 7 | BXO – 4 | -15 | 25E | 177 | 22E | 2 | 122 |
| 8 | ESO – 2 | -22 | 33E | 169 | 30E | 13.5 | 121 |
| 9 | AX – 1 | -15 | 15W | 217 | 18W | - | 125 |
| 10 | FSC – 18 | -23 | 62W | 264 | 65W | 21 | 163 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.