Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 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)
- 7
- Number of spots (f)
- 51
- Relative number (R)
- 121
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19900313.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 28 | 72W | 183 | 75W | 5 | 102 |
| 2 | BRI – 10 | 11 | 32W | 143 | 35W | 4 | 104 |
| 3 | BXO – 3 | 26 | 10E | 101 | 7E | 5 | 107 |
| 4 | HS – 3 | 20 | 10E | 101 | 7E | 3 | 106 |
| 5 | CKI – 25 | 32 | 35E | 76 | 32E | 9 | 108 |
| 6 | HA – 7 | -12 | 70W | 181 | 73W | 7 | 103 |
| 7 | AX – 1 | -24 | 29E | 82 | 26E | - | 112 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.