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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 30, 1999. Coordinates are given as of the end of the day.
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 8526 | N22 | E33 | 01 | 0010 | ALPHA | May 4, 1999 | May 11, 1999 | May 24, 1999 |
| № 8525 | N15 | E66 | 01 | 0070 | ALPHA | May 6, 1999 | May 13, 1999 | May 27, 1999 |
| № 8524 | N22 | W17 | 24 | 0310 | BETA | Apr 30, 1999 | May 7, 1999 | May 21, 1999 |
| № 8523 | N32 | W23 | 04 | 0020 | BETA | Apr 29, 1999 | May 6, 1999 | May 21, 1999 |
| № 8522 | N17 | W16 | 07 | 0030 | BETA | Apr 30, 1999 | May 7, 1999 | May 20, 1999 |
| № 8518 | S13 | W95 | 01 | 0060 | ALPHA | Apr 24, 1999 | May 1, 1999 | May 14, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to April 1999. The gray background is the average SSN index.
