Tuesday 28 May 2019

Solar Astronomy

So, the telescope is sitting htere, it is the time of year when there is no astroniical night, what can I do?

Look at the Sun! So, after buying a pack of Baader Solar film and following the instructions to make a solar filter that fits over the dew cap of the Skywatcher ED 80 Pro, I am no able to take images and video if the Sun in white light. The colour cast in the photo is because I am not bothering to remove the  Light Pollution filter from the camera. So far, because the Sun is at solar minimum, there have't been any faculae or sunspots.



What can be seen (just) is the limb darkening and a hint of the granulation.
Limb darkening is an optical effect seen in stars (including the Sun), where the center part of the disk appears brighter than the edge or limb of the image.

Granules on the photosphere of the Sun are caused by convection currents (thermal columnsBĂ©nard cells) of plasma within the Sun's convective zone. The grainy appearance of the solar photosphere is produced by the tops of these convective cells and is called granulation.

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