Viewing archive of Thursday, 21 September 2017 - Sunspot regions

Sunspot regions

Courtesy of SDO, SOHO (NASA) and the [AIA, EVE, and/or HMI] consortium.
Sunspot number New regionsBackground fluxMaximum flux
220 -1A1.57B1.37

Sunspot regions

Region 12680

Number of
sunspots
Size Class Magn. Class Spot Location
1 60 10 HSX N08W67
HMIIF
HMIBC

Region 12681

Number of
sunspots
Size Class Magn. Class Spot Location
1 60 HSX S12E73
HMIIF
HMIBC

All times in UTC

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Last X-flare2026/03/30X1.5
Last M-flare2026/03/28M1.3
Last geomagnetic storm2026/03/25Kp5+ (G1)
Spotless days
Last 365 days3 days
20263 days (3%)
Last spotless day2026/02/24
Monthly mean Sunspot Number
February 202678.2 -34.3
April 2026130 +51.8
Last 30 days91.6 +20.3

This day in history*

Solar flares
12001X28.5
22001X2.01
32001X1.59
42014M9.35
52017M8.22
DstG
11960-272G3
21973-173G3
32001-101G1
41976-101G1
51994-96G3
*since 1994

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