Layers in the Solar Chromosphere

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.

2 Responses

  1. Well done Roger, nice images. The CaK will give image mid chromosphere, as temp rises as you pass up through the chromosphere from the photosphere and the Ca atoms require less energy to ionise them than Hydrogen.
    Unfortunately was away thurs/fri, then when was able to set up on Saturday, was just about to start imaging when the cloud rolled in!!!!!!!!!
    But as I suspected after the original setting up, putting the scopes in the tube rings and tightening the top screw everthing is more or less on target with minimal adjustment required.

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