Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 February 1970
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)
- 99
- Relative number (R)
- 209
- Observer
- TY
- Reading
- all checks consistent
- File
- 19700217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 10 | -15 | 64°E | 299 | |||
| 2 | ? – 12 | -19 | 73°E | 290 | |||
| 3 | A – 5 | -9 | 02°E | 1 | |||
| 4 | E – 20 | -22 | 25°E | 338 | |||
| 5 | B – 31 | -13 | 02°E | 1 | |||
| 6 | A – 3 | -14 | 06W | 9 | |||
| 7 | J – 2 | -21 | 63°W | 66 | |||
| 8 | A – 2 | -14 | 36W | 39 | |||
| 9 | C – 8 | -14 | 71W | 74 | |||
| 10 | ? – 2 | 20 | 79W | 82 | |||
| 11 | A – 4 | 22 | 28W | 31 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.