First day in Munich

Well, apart from 11 hours in the office spending lots of time chatting physics, I was witness to a partial solar eclipse, a 22 degree solar halo, an upper tangent arc and a circumzenithal arc. I only have the first three on camera, but I can promise that the fourth was spectacular. Most of the time the solar halo was completely behind clouds this morning, but I was able to get this one shot. Not the greatest shot ever (and NOTHING compared to this), but still:

and a half hour later, the cirrus clouds came in and I had a ten minute slot of this wonderful 22 degree halo and upper tangent arc:

Interestingly, there doesn't seem to be any reflection of the halo in the window on the right, which could be related to the polarisation of the reflected light, and the surface of the window.

When going for lunch later, the Cheshire Cat halo was out, but my camera was not. Still, not bad for the first day in Munich!

Sundogs burning over Santiago

Back in Santiago and with an intimidating amount to get done in a week before I hit the road again, but I wanted to post some photos I took yesterday.

I was heading into town to see a friend I haven't seen for a couple of months and on the way I noticed the hint of a sundog as the cirrus cloud tickled the 22 degree peripheries of the suns reaches. We went for a walk in the Alameda park in the centre of the city and by the time we got to the point overlooking the hills in the distance, the lone sundog had turned into two brilliant points of light in the sky, dazzlingly colourful and being bisected by a sun column and the faintest hint of an upper tangent arc. It was the strongest display of a double sundog I've ever seen and so I got my normal volley of shots off before the sun disappeared into the clouds:

Keep an eye out over the next few days. It tends to be as the seasons change that we see more of these glorious scenes.

Stunning solar halo over Porto

From ice and sunlight amazing things will come...

I'm going to do a full Porto blogpost soon, but I needed to get this out before anything else, as anyone who knows me will understand.

Sunday afternoon I was in the gardens of a wonderful modern art museum in Porto (Serralves), walking around and taking in the sun with a friend of my couchsurfing host.I looked up, as I seem to spend most of my time doing and caught a glimpse of a solar halo beginning to form. We got out into an open area and watched as the upper arc of the solar halo turned into the most stunning display I've ever seen.

As the field of ice in the clouds swept across the sun, for around half an hour the sky was illuminated with the most stunning arcs, halos, sundogs and perhelia I could imagine. Of course I got a ridiculous number of photos of this and have only gone through some of them in detail. In particular it appears that the pictures of the sundog may have captured a phenomenon rarely captured on film. As explained to me by the author of the superb site atoptics when I sent him the photos:

'...But something about your image caught my eye. I then severely enhanced it and have attached the result. It looks to me as though you have the very rare Lowitz arcs and have unusually captured the upper, lower and middle Lowitz components. See the very first Lowitz image for comparison..' This effect was first captured here, but it seems possible that I may have caught it too.

On top of the 22 degree halo, the upper tangent arc and the sundog, there was a lovely 120 degree parhelion, something I'd never seen before. Having spent some time reading atoptics in the past I had a good idea where each of these effects was coming from and to see them so vividly was wonderful! Each part of the pattern comes from a particular shape of ice crystal with a given orientation and a specific path of light, sometimes through the faces and sometimes through the edges.

Of course I told those around me about the amazing display in the sky but all but two of them showed no interest at all, looking up and then seeming rather surprised that I'd bothered them about it.

Anyway, here are a few of the pictures I took of this startling sight:

The upper tangent arc, the 22 degree halo and the sundog:

The halo, the sundog and the parhelic circle:

The sundog, the parhelic circle and the 120 degree parhelion:

and the 120 degree parhelion shining brightly. It seems that as noted occasionally before, this has a faint redish tinge to it (only seen on the zooms):

All of the above images can be seen in larger sizes by clicking. There are also currently a great number more photos on my flickr account as I've simply dumped them up there for now for further analysis.

I have mixed emotions about this. On the one hand I was overwhelmed with the sight, grinning and running around like a kid in a sweet shop for half an hour, while on the other I'm saddened by the lack of interest most people have in the wonders of nature. Still, in a few weeks I will be doing my bit by giving a lecture to the whole physics department on atmospheric optics. I hope to get another few people enthused by what is out there!