Daily Sunspot Evaluation
Observation Sheet Sunday, 13 September 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)
- 7
- Number of spots (f)
- 41
- Relative number (R)
- 111
- Observer
- TA
- Reading
- all checks consistent
- File
- 19980913.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 5 | 13 | 74W | 226 | 77W | 6 | 208 207 |
| 2 | ESO – 5 | 15 | 50W | 202 | 53W | 11 | 199 200 |
| 3 | EAC – 18 | 25 | 01W | 153 | 04W | 13 | 201 203 |
| 4 | CAO – 3 | -23 | 52W | 204 | 55W | 5 | 215 208 |
| 5 | HS – 3 | -17 | 39W | 191 | 42W | 3 | 205 204 |
| 6 | CAO – 3 | -23 | 02W | 154 | 05W | 4 | 206 205 |
| 7 | DAO – 4 | -22 | 63E | 89 | 60E | 7 | 210 209 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.