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Yes, there is - in winter the stratosphere moves down somewhat, although it still ends up being much higher than Earth (the hard photon flux is down by a factor 5 or so, but given that the density drops exponentially with altitude, that's not dramatic for things like O3 production rate).

The version 0.5 is now also out - with nice toys for looking into atmosphere structure: Here is a case study of Brian Aldiss' Helliconia, a world that orbits its small sun Batalix while both in turn orbit hot and luminous Freyr,, leading to a summer at Freyr periapsis and a winter at apoapsis...

I'm kind of limited by what the MPI UV/Vis spectral atlas offers in terms of cross sections... but yeah, there are quite a few lineshapes available. As far as O2 is concerned, I agree - Earth history shows how heavily biosphere driven it is. However, it's much more interesting to simulate a...

Here's some work in progress - the Chapman mechanism (UV light dissolves O2 -> O+O, part of that forms ozone, ozone has a strong absorption cross section at longer wavelength UV and leads to a pronounced heating of the upper atmosphere, giving rise to the temperature increase in the...

I'm happy to announce the version 0.4 of the simulation tool which now can do some stuff on atmosphere and hydrosphere transport and has a simple weather and climate code for Earth-like worlds (there's more to come, but it's already fun to play with what is there). Here's a quick view on...

If anyone is interested, the article is now finished with the discussion of a few exotic phenomena - light scattering on ice crystals for instance, or the question of green sunsets.

That's kind of the point of the project - to illustrate what matters how. As you'll figure out quickly when you actually try this - a bare atmosphere is easy to compute (that works with decent accuracy even in real time). The reason is that you can see through the atmosphere, it is optically...

I've long been interested in light passing through the atmosphere, particularly in sunsets. Initially this came from implementing low light halfway correctly in real time 3d rendering, but I've quickly discovered that many multiple scattering processes are simply too complex to include in a fast...

For those following the Cliodhna-series, here is our episode 8 'The Raven' Enjoy!

A new episode of the mini-series 'A Sword and his Hero' - this time the Sword learns about the simple pleasures of human(oid) life:

I'm happy to announce the version 0.3 which now includes support for some of the issues we had discussed. In particular, it is now possible to set up the simulation of gas giant moons - here is an example of temperatures on Io This includes the (optional) effect of eclipses and reflected and...

It's charming in a way, but... Are you by any chance confusing my hobby with an NSF grant review? I don't propose to provide a tool to simulate 'most' 'interesting' exoplanets (as for 'most', since finding them is significantly biased by the finding methods which prefer large and heavy...

Those would be most conveniently specified as 'at L4 (or L5)' and placed using a Lagrange point finder (surprise, I have one of those as well...) I've never heard that you can have planets developing there though... it seems kinda hard to accumulate enough mass, usually it's just debris that's...

Not upon init, but you can run the orbital solver to get to your point of interest and then start the thermal solver on top. No. I know they're interesting for habitability by e.g. stabilizing the rotation axis, but that's a long-term stability thing and outside of the scope of the program -...

Okay, I managed to get the update out - this can now also do planets orbiting binary stars. Here's an example from 'Helliconia', a novel series by Brian Aldiss. Helliconia orbits sun-like Batalix which in turn orbits Freyr on an elliptical orbit with an eccentricity of 0.5 - at periapsis Freyr...

Actually, my main motivation is the hands-on experience of astrophysics - I just happen to like doing science:cool: So yeah - one could include all sorts of things, but then again, I've made it available GPL, so there could also be all sorts of contributors other than myself. *** Here's an...

Re-reading this, you're actually right - it is misleading. I'll change it, thanks for being persistent (y)

I don't think we disagree in what happens - merely semantics. Is a process where stuff flies outward from the center an explosion? Certainly the formation of a White Dwarf is a slow process - but then again, if you'd watch a real-time movie of a supernova, it wouldn't fit our intutition of an...

Yeah, it's a logical extension (and in fact I have one without GR corrections already). It'll probably come, I'll need to do some work on a user-friendly multi-body init first. That's a good idea, yes. I started the code before I discovered gas giant moons as interesting targets for...

Just a quick note that I have now published the code I've been using for this thread and am working on a tutorial series how it can be used. See the project page: http://www.science-and-fiction.org/science/worldbuilder.html The code is GPLv2+, so enjoy.