This filtered image shows (from left to right) sunspot groups AR3646, AR3647, AR3645, AR3638, and AR3637. According to Spaceweather.com AR3645 has already unleashed M-class solar flares and may soon unleash a more powerful X-class solar flare.

Celestron 102XLT refractor, APM Herschel wedge, ZWO ASI290MM with Player-One photosphere filter, SkyWatcher EQ6R Pro mount.

Best 250 out of 1000 frames were stacked with Autostakkert, wavelets with Registax, additional post-processing with Photoshop and Photoscape X.