Just putting out the bins tonight when I caught sight of this. So whipped out the camera and got this from an upstairs window.
Author Archives: Roger Samworth
Here is an interesting thought inspired by Pete Hill’s “solar array”.
If we observe the Sun in white light, we are seeing the photosphere.
If we observe the Sun in H-alpha light, we are seeing the chromosphere.
The chromosphere (literally, “sphere of color”) is the second of the three main layers in the Sun’s atmosphere and is roughly 3,000 to 5,000 kilometers deep.
If we therefore mix a white light with a Ha image in different proportions, are we seeing different layers as we go through the chromosphere?
By a fortuitous coincidence my Ha scope and the scope I use for white light imaging have the same focal length, and so produce the same sized images. So this mixing is quite easy to do.
Here is sunspot 2699 on 07/02/2018 together with the mixed sequence.
Here is another of the window-sill lunar images following the “Moonwatch” articles in “Sky at Night” magazine (April 2018 this time). Although still light outside, the lunar lighting was about right. The first is the base image, and the other two rotated and cropped to match the image in the magazine.