Maximum Gradients

Video of AR 11861 tracked slowly showing a ‘+’ where the gradient is at maximum for both the normal magnetogram and the gradient magnetogram maps. (Make sure to watch in HD, also the horizontal black lines which sometimes occur in magnetogram data seem to be caused be graphics issue on my laptop)

The highest gradients are nearly always found along neutral lines between nearby emergent flux regions of opposing polarity. During these times there is lots of flaring. Towards the second half of the video flares are more sparodic and the maximum is sometimes found in uni-polar features. The maximums themselves are lower as the flare rate dies off at the end as well which can be seen in the figure below. The figure also clearly shows that when the maximum gradient is high for the field of view there is more flaring activity.

Image

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