Daily Sunspot Evaluation
Observation Sheet Monday, 21 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)
- 11
- Number of spots (f)
- 75
- Relative number (R)
- 185
- Observer
- YK
- Reading
- counts consistent, some coordinates doubtful
- File
- 19980921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | -19 | 72W | 118 | 74W | - | 221 220 |
| 2 | BXO – 2 | 26 | 17W | 63 | 19W | 3.5 | 222 221 |
| 3 | CAO – 9 | 18 | 22E | 24 | 20E | 6.5 | 218 215 |
| 4 | HS – 2 | 32 | 28E | 18 | 26E | 3.0 | 211 213 |
| 5 | HK – 16 | 19 | 35E | 11 | 33E | 6.5 | 215 214 |
| 6 | CAO – 5 | 38 | 48E | 358 | 46E | 5.5 | 213 212 |
| 7 | DAO – 3 | -21 | 42W | 88 | 44W | 8.0 | 210 209 |
| 8 | BXO – 4 | -40 | 11W | 57 | 13W | 6.0 | 212 211 |
| 9 | CAI – 26 | -30 | 04W | 80 ⚠ | 06W | 9.5 | 213 212 |
| 10 | CAO – 4 | -17 | 02W | 48 | 04W | 10 | 216 215 |
| 11 | BXO – 3 | -19 | 48E | 358 | 46E | 4 | 210 213 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.