Daily Sunspot Evaluation
Observation Sheet Saturday, 17 March 1990
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)
- 8
- Number of spots (f)
- 51
- Relative number (R)
- 131
- Observer
- HE
- Reading
- all checks consistent
- File
- 19900317.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 20 | 41W | 100 | 44W | 2.5 | 106 |
| 2 | CKI – 11 | 32 | 15W | 74 | 18W | 8 | 108 |
| 3 | CSO – 4 | 42 | 26E | 33 | 23E | 4.5 | 116 |
| 4 | HS – 1 | 4 | 31E | 28 | 28E | 1 | 113 |
| 5 | CAI – 12 | 15 | 55E | 4 | 52E | 10 | 117 |
| 6 | HA – 2 | -20 | 40E | 19 | 37E | 1 | 115 |
| 7 | ESI – 19 | -35 | 41E | 18 | 38E | 15 | 114 |
| 8 | HA – 1 | -11 | 72E | 347 | 69E | 65 | 119 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.