Daily Sunspot Evaluation
Observation Sheet Thursday, 17 January 1991
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)
- 79
- Relative number (R)
- 179
- Observer
- HE
- Reading
- all checks consistent
- File
- 19910117.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FKI – 24 | 15 | 41W | 19 | 43W | 22° | 22 |
| 2 | CAI – 4 | 28 | 10E | 328 | 08E | 6° | 32 |
| 3 | AR – 3 | 4 | 39E | 299 | 37E | 3° | 34 |
| 4 | AR – 5 | 22 | 60E | 278 | 58E | 1.5 | 35 |
| 5 | BRO – 2 | -24 | 23W | 1 | 25W | 5.5 | 33 |
| 6 | BRO – 2 | -14 | 14W | 352 | 16W | 3° | 30 |
| 7 | CKI – 20 | -7 | 14W | 352 | 16W | 8.5 | 27 |
| 8 | AR – 4 | -21 | 01E | 337 | 01W | 2.5 | 31 |
| 9 | DAC – 13 | -14 | 03E | 335 | 01E | 6° | 36 |
| 10 | BRO – 2 | -28 | 53E | 285 | 51E | 5° | 37 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.