Volcanic Dust Alert?

[brianb]

I was wondering if there was any worth in viewing it in polarised light?

The logic being ....?

I would have thought that light reflected from volcanic dust would be randomly polarized, as would the diffuse skylight in the direction of the sunset, so there wouldn't be much effect except the usual light loss that goes with polarizers.

[markt]

I was wondering if there was any worth in viewing it in polarised light?

The logic being ....?

I would have thought that light reflected from volcanic dust would be randomly polarized, as would the diffuse skylight in the direction of the sunset, so there wouldn't be much effect except the usual light loss that goes with polarizers.

No logic behind it, just me wondering.  Your explanation does make sense though.   I'll test your hypothesis next timeit clears uos at sunset

[rjgjr]

Not much volcanic dust action left here in Oregon, image from last night.

[Paul]

Good one from Larne last night....

[brianb]

Yeah, I thought there was a bit of volcanic colouration just above the NW horizon in deep twilight last night. Can't be sure though as the transparency was not very good, in fact it clouded over completely at around 0100 BST & didn't clear again. NLC negative but extensive interference from haze & tropospheric cloud low in the north.

[martinastro]

Very nice images Richard and Paul.

Impressive volcanic dust display here with vivid lines of material converging on the sunset point (sun below local horizon) like huge spokes similar to a bicycle wheel. Entire display has turned vivid pink here, and still visible - quite impressive!.

[martinastro]

Here's a few shots of tonight's volcanic display with the Sun below the local horizon taken at various stages as the sky darkened. The structure reminded me of synchronic bands in the huge sweeping tail of a great comet with its head below the horizon.

[brianb]

Very interesting - I dismissed the faint radial bands as remnants of the cirrus which was dispersing during the late afternoon & evening, but the red/orange glow on the horizon looks volcanic to me.

NLC negative again.... nights growing longer & Arcturus getting low by dawn, won't be long before it starts going properly dark!

[rjgjr]

Beautiful images Martin, I really like # 2. Good job!!

[Roman White]

Very nice images Martin! 

[Roman White]

Jul.18, 04:47 EEST (7 minutes before sunrise)

(Strip of clear blue skies is visible in the centre)

[rjgjr]

Great shot Roman!

[martinastro]

Very well spotted Roman!.

Seen a structured dust display above the sun during the evening with delicate white ripples like NLC.

[John9929]

Very nice image Roman, unfortunately my moon was hidden by cloud! Here's one from this morning.