Thanks for that Alan! On the visual Au front. Last year wasn't too good for them but 2 or 3 years ago there seemed to be a good number of them nicely spread over the mid-winter. Last night's display
Hi Dave, yes indeed. There are two main sources of geomagnetic storm "stimulation". The first is the well known Coronal Mass Ejections (CMEs) that emanate from the area of sun-spots and are usually a