Thursday, 23 October 2014 - 16:24 UTC
Sunspot region 2192 has grown today to a size of 2700 millionths of a solar hemisphere making it the largest sunspot region in almost 24 years. Sunspot region 2192 is now even larger than sunspot region 486, which was the source of several strong solar flares almost exactly 11 years ago. Sunspot region 2192 has however been relatively quiet since the X1.6 solar flare (no associated coronal mass ejection) that occurred yesterday. There has been only one M-class flare today: M1.1 at 09:50 UTC. Why is it so quiet? In this article we will take a look at sunspot region 2192 and compare it with two other famous sunspot regions.
Sunspot region 2192 is now at the center of the earth-facing solar disk and remains very big but the best seems to be over with some decay in it's trailing section and loss of penumbral area in the central penumbral crumble. Several other spots also shrunk in size over the past few hours. Nontheless, it is now the largest sunspot region in 24 years.
As of last night two new delta spots emerged just west of the leading spot, these two tiny delta structures are still there and are stable. One other new tiny delta spot is seen south of the leading spot.
Due to the slight decay of this region, sunspot region 2192 has been a bit more quiet but it still has the capabilities for further M-class events and a slight hances for another X-class event in the coming 24 hours.
All the other sunspot regions on the disk are unremarkable. Any future solar flares will very likely be centered around sunspot region 2192 which is now directly facing Earth.
Images: NASA SDO.
M-class flare probability: 60% chance
X-class flare probability: 10% chance
Sunspot region 2192 is large, but how large exactly? We made a special image combining SDO and SOHO imagery showing three large sunspot regions: sunspot region 486 from October 2003 which was the largest sunspot region of solar cycle 23. Sunspot region 1967 from January 2014 which is now the second largest sunspot region of the current solar cycle and of course sunspot region 2192 from today which is the largest sunspot region in almost 24 years time. We also added a scale to show you how big these sunspot regions are when you compare them with planet Earth and Jupiter.
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