Sunspot AR 4139

Sunspot AR 4139 is a large, magnetically basic active region currently visible on the Sun’s surface. It contains 4 visible spots and spans an area of 220 millionths of the solar hemisphere. This region has produced no significant flares so far and currently shows a 25% probability of C-class, 5% of M-class, and 1% of X-class flares. It is located at heliographic latitude N22°, Earth-facing longitude -80°, and Carrington longitude 36°.

Sunspot Location on Map

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Selected map type: AIA 171 Å

Sunspot Properties

Region Number	4139
First Observed	2025-07-11 10:01
Sunspot Type	Dso
Magnetic Class	B
Area	220 MSH
Number of Spots	4
Extent	9 heliographic degrees
Latitude	22°
Longitude	-80°
Carrington Longitude	36
Status	f

Flare Activity

No flares detected.

Sunspot Evolution

The following graphs show how this sunspot region 4139 has changed over time. The first graph displays its total area on the solar surface, while the second shows the number of individual sunspots observed within the region.

Sunspot Area

This graph illustrates the physical growth of the sunspot region, measured in millionths of the solar hemisphere (MSH). Increases in area typically indicate developing magnetic complexity and potential for solar activity.

Spot Count

This graph shows the number of visible sunspots within the region at each observation time. A higher spot count often corresponds with a more active or complex region.

Detailed History

Date	Area (MSH)	Spot Count	Classification	Flares	Location
2025-07-19	220	4	Dso	-	N22W80
2025-07-18	250	5	Dko	-	N22W68
2025-07-17	260	12	Dko	-	N22W55
2025-07-16	250	11	Dko	-	N22W42
2025-07-15	100	13	Dai	-	N22W30
2025-07-14	70	13	Dao	-	N21W15
2025-07-13	100	6	Dai	-	N22W04
2025-07-12	60	5	Dai	-	N22E10
2025-07-11	20	3	Cro	-	N22E22

Acknowledgements

We gratefully thank the teams behind the Solar Dynamics Observatory (SDO), including the HMI, AIA, and EVE instrument teams, for their continuous work in solar monitoring.

We also thank the National Aeronautics and Space Administration (NASA), the Goddard Space Flight Center (GSFC), and the National Oceanic and Atmospheric Administration (NOAA) for their contributions to solar science and public data access.

Additional event data is provided by NASA’s DONKI (Database of Notifications, Knowledge, Information), which offers alerts and detailed records of solar flares, CMEs, and geomagnetic storms.

Observation Settings