Spot 2699 development – 12/02/2018

Spot 2699 is well past the meridian now, but still has plenty of detail. Spaceweather says:

“Sunspot AR2699 is a shape-shifter. Over the weekend it morphed into a quadruple ‘spot, with two new magnetic islands as large as Earth. Rapid changes in the appearance of a sunspot mean one thing: Its magnetic field is changing rapidly as well. Tangled magnetic fields can criss, cross, and explode–a process known as “magnetic reconnection.” Solar flares in the magnetic canopy of AR2699 are likely on Feb. 12th.”

For those that missed the comments on my last post, this is how I do it :

I capture the whole sequence with the Mikrokular as 200 frame avis for each image at 10-25 fps.1 exposure for the disc features and 1 for the prominences. The white light image is done with the 80mm f/5 refractor that has the same focal length as the Lunt LS35Th and therefore gives the same image size. The whole disc image is obtained using a focal reducer, and the surface details with a X2 barlow. The bedroom window faces south-east, so the Sun is in a favourable position not long after sunrise. The whole acquisition sequence with both scopes usually takes around 15-20 minutes. If it is the weekend and early-ish, I might well be still in my dressing-gown – but that isn’t essential.

I then stack and wavelet sharpen in Registax 6 and process in GIMP.

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