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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 9, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8541 | N22 | E69 | 09 | 0130 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8540 | S28 | E61 | 05 | 0140 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8539 | N14 | E33 | 06 | 0050 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8538 | N11 | W44 | 07 | 0050 | BETA | May 7, 1999 | May 13, 1999 | May 27, 1999 |
| № 8537 | N19 | W71 | 07 | 0230 | BETA | May 4, 1999 | May 11, 1999 | May 25, 1999 |
| № 8536 | S24 | E27 | 15 | 0070 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8535 | N22 | E44 | 04 | 0300 | BETA | May 13, 1999 | May 20, 1999 | Jun 3, 1999 |
| № 8534 | S17 | E37 | 04 | 0060 | BETA | May 13, 1999 | May 20, 1999 | Jun 2, 1999 |
| № 8533 | N04 | E36 | 05 | 0040 | BETA | May 13, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8531 | N19 | E10 | 04 | 0020 | BETA | May 11, 1999 | May 17, 1999 | May 31, 1999 |
| № 8526 | N19 | W78 | 05 | 0260 | BETA | May 4, 1999 | May 11, 1999 | May 25, 1999 |
| № 8525 | N17 | W47 | 01 | 0150 | ALPHA | May 6, 1999 | May 13, 1999 | May 27, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to May 1999. The gray background is the average SSN index.
