This image is how a squid, shrimp or some types of fish might have perceived the eclipse from Spain as they don't detect colour but do see polarisation. However,  it must be said that Spain in a heatwave was perhaps a little dry for them.

Okay, this takes a little explaining...

If you image the Sun's corona through a linear polarising filter it looks different in extent and intensity compared to an unfiltered normal image. The differences vary as the angle of the polariser relative to the polar axis of the Sun is varied. 

I believe this occurs because the presence of an intense magnetic field can polarise light. Plasmas also generate circularly polarised light, but thats another story...

So, I took pictures of the Sun at a variety of different linear polariser angles and converted each into a luminance image. I then assigned one each as R, G, B images and combined them in AstroArt just like people do with H-alpha, S-II and O-III images in deep sky observing. Just to add to the fun I created a master luminance frames from my 20 or so non-blurred images and created a crude LRGB image - its not easy as the Moon is moving across the Sun and its corona.

The result gives an idea of both the extent of the corona and also the direction of the the magnetic field within it.

Ideally, I should have taken 4 images at 0, 45, 90, 135 degrees orientations and done a full calculation of the Stokes parameters and gained estimates of stuff like DoLP and polarisation angle*, but - as I found in 2017** - it was too dark to tell how the filter was orientated, so I just settled for a bunch of different angles and looked for images that appeared very different when I selected the R, G, B components.

And what you see is the result... Its not as clean as my result from 2017 but the corona was dimmer and the dust, atmosphere and smoke will have diminished the signal. I may process the data like I did in 2017, but that would mean converting code from IDL to Python and I'm a bit busy currently.

* See Fundamentals of Polarimetric Remote Sensing by Richard Schott, SPIE Press or Wiki

** https://britastro.org/observations/observation.php?id=20170821_212900_2719fa19455c8db4