Daily Sunspot Evaluation
Observation Sheet Monday, 13 March 1972
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)
- 35
- Relative number (R)
- 105
- Observer
- FA
- Reading
- all checks consistent
- File
- 19720313.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 17 | 15 | 13E | 106 | |||
| 2 | B – 7 | 7 | 30E | 89 | |||
| 3 | J – 1 | -19 | 27E | 92 | |||
| 4 | J – 2 | -21 | 26W | 145 | |||
| 5 | H – 3 | -9 | 79W | 198 | |||
| 6 | J – 2 | -9 | 63W | 182 | |||
| 7 | J – 3 | 16 | 02W | 121 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.