Author Archives: Roger Samworth

AR2736 development

AR2736 has developed rapidly, unusual, since we haven’t seen a decent sunspot for a while.

“Spaceweather” says:

“A few days ago, sunspot AR2736 didn’t exist. Now, the rapidly-growing active region stretches across more than 100,000 km of the solar surface and contains multiple dark cores larger than Earth. Moreover, it has a complicated magnetic field that is crackling with C-class solar flares.”

The images are fairly poor due to the extreme acute angle with the double glazing!

“Electronic eyepiece” Visual experience – – – more

I have now mounted the screen (with Velcro) on the scope mount, which seems the best place for it. Last night’s almost full moon was on display, so here are some photos of the screen, Obviously nothing like as good as proper imaging, but it IS a computer-free visual experience!

The first one is with a focal reducer, the second straight into the camera, and the last two with a X2 barlow.


AR2736 flare – – -20/03/2019

According to “Spaceweather”:

“New sunspot AR2736 is growing rapidly in the sun’s northern hemisphere. This morning at 1118 UT, it announced itself with a C4-class solar flare.” 

Here is a fade animation of the AR2735 / AR2736 spot group pre and post this morning’s flare. The earlier image was at 09:38 UT taken with light cloud cover, the later one at 11:40 UT.

Window-sill astronomy

To all you doubters out there, there is an article on this subject in April’s Sky at Night magazine – – -!

The article says “Observing through a closed window is not recommended due to reflections and distortions”


A closed window prevents air currents and that is much better than an open window. If you are in a dark room and the telescope objective is close to the window the “reflections and distortions” are minimised.

Take a look at some of my window-sill images if you don’t believe that!