Daily Sunspot Evaluation
Observation Sheet Sunday, 12 May 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)
- 11
- Number of spots (f)
- 88
- Relative number (R)
- 198
- Observer
- TA
- Reading
- all checks consistent
- File
- 19910512.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKC – 14 | 30 | 08W | 268 | 09W | 8 | 208 |
| 2 | CKO – 14 | 7 | 02W | 262 | 03W | 8.5 | 209 |
| 3 | AR – 1 | 8 | 08E | 252 | 07E | 213 | |
| 4 | CAI – 19 | 3 | 08E | 252 | 07E | 6 | 212 |
| 5 | CKO – 5 | 10 | 29E | 231 | 28E | 10.5 | 215 |
| 6 | AX – 2 | 14 | 32E | 228 | 31E | 0.5 | 220 |
| 7 | AX – 3 | -16 | 58W | 318 | 59W | 2.5 | 221 |
| 8 | HS – 1 | -28 | 01E | 259 | 00 | 2 | 210 |
| 9 | AX – 1 | -23 | 05E | 255 | 04E | 212 | |
| 10 | DAC – 26 | -16 | 26E | 234 | 25E | 10 | 216 |
| 11 | AR – 2 | -11 | 64E | 196 | 63E | 0.5 | 225 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.