Viewing archive of Thursday, 21 October 1999 - Sunspot regions
Courtesy of SDO, SOHO (NASA) and the [MDI, AIA, EVE, and/or HMI] consortium.
| Sunspot number | New regions | Background flux | Maximum flux | C |
|---|---|---|---|---|
| 154 -39 | 0 -2 | C1.14 | C8.84 | 12 |
Sunspot regions
Region 8728 |
||||
|---|---|---|---|---|
| Number of sunspots |
Size | Class Magn. | Class Spot | Location |
| 3 | 110 -20 | CAO | N24W83 | |
Region 8731 |
||||
|---|---|---|---|---|
| Number of sunspots |
Size | Class Magn. | Class Spot | Location |
| 45 -18 | 440 -200 | EKI | N14W55 | |
Region 8732 |
||||
|---|---|---|---|---|
| Number of sunspots |
Size | Class Magn. | Class Spot | Location |
| 23 -6 | 170 -20 | FAI | N22W64 | |
Solar flares on this day | ||||
| C6.04 C3.43 C3.29 | ||||
Region 8734 |
||||
|---|---|---|---|---|
| Number of sunspots |
Size | Class Magn. | Class Spot | Location |
| 5 | 10 | BXO | N20W46 | |
Region 8735 |
||||
|---|---|---|---|---|
| Number of sunspots |
Size | Class Magn. | Class Spot | Location |
| 3 -1 | 10 -10 | BXO | N18W19 | |
Region 8736 |
||||
|---|---|---|---|---|
| Number of sunspots |
Size | Class Magn. | Class Spot | Location |
| 2 | 10 10 | AXX | S25W06 | |
Region 8737 |
||||
|---|---|---|---|---|
| Number of sunspots |
Size | Class Magn. | Class Spot | Location |
| 17 9 | 70 20 | DAO | S16E01 | |
Solar flares on this day | ||||
| C2.84 | ||||
Region 8738 |
||||
|---|---|---|---|---|
| Number of sunspots |
Size | Class Magn. | Class Spot | Location |
| 2 | 10 | AXX | N16E28 | |
Region 8739 |
||||
|---|---|---|---|---|
| Number of sunspots |
Size | Class Magn. | Class Spot | Location |
| 3 | 50 | CAO | S14E71 | |
Solar flares on this day | ||||
| C3.09 C3.37 | ||||
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| Spotless days | |
|---|---|
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| Monthly mean Sunspot Number | |
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