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  1. Thorsten

    The Physics of Sunsets

    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.
  2. Thorsten

    The Physics of 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...
  3. Thorsten

    The Physics of Sunsets

    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...
  4. Thorsten

    Making Movies

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

    Making Movies

    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:
  6. Thorsten

    Fictional Exoplanet creation

    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...
  7. Thorsten

    Fictional Exoplanet creation

    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...
  8. Thorsten

    Fictional Exoplanet creation

    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...
  9. Thorsten

    Fictional Exoplanet creation

    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 -...
  10. Thorsten

    Fictional Exoplanet creation

    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...
  11. Thorsten

    Fictional Exoplanet creation

    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...
  12. Thorsten

    Fictional Exoplanet creation

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

    Fictional Exoplanet creation

    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...
  14. Thorsten

    Fictional Exoplanet creation

    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...
  15. Thorsten

    Fictional Exoplanet creation

    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.
  16. Thorsten

    Making Movies

    Teaser for Episode 9 of the Cliodhna-series - in 'Samhain' we have a second important Wicca festivity as theme of the movie:
  17. Thorsten

    Numerical Epidemics

    Version 0.4 has just been published which now includes the ability to simulate the effect of ongoing vaccination campaigns (before we could only do prior immunity). Here's an appetizer, showing how a baseline scenario responds to different starting days and numbers of vaccination attempts per...
  18. Thorsten

    Fictional Exoplanet creation

    I don't know the source you're referring to, but I would assume that the general pattern must be a mixture of inflow to the subsolar point at ground level, outflow in the upper atmosphere and inflow and outflow by 'fingers' of air driven by the boundary instability It is clear that heat...
  19. Thorsten

    Fictional Exoplanet creation

    Up to this point, things were fairly calculable. Now the Fi-part of SciFi starts - I draw a collection of landmasses underneath the climate lines. The distribution should be Earth-like (more water than land) since the Albedo was similar. From there then follows a measure of geology, and...
  20. Thorsten

    Fictional Exoplanet creation

    That is in explicit contradiction to your basic idea of a photosphere having a given temperature though. Let's clear up the terms so that we see what law applies where. The relevant issue is - how do we excite states in the molecules? And how do we de-excite them? In the case of aurorae for...
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