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  1. 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:
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. Thorsten

    Fictional Exoplanet creation

    In the total energy balance yes, but not per wavelength. What you say is true for line emission, but that's not the mechanism we're dealing with here - we have line absorption but broad blackbody emission.
  7. Thorsten

    Fictional Exoplanet creation

    I don't know, and therefore I can't really recommend it. I have to say in advance that I don't have a full transport code myself (although I know how it should be written and could do it, given sufficient time and motivation). But my current code can't do Venus. I guess in essence you're...
  8. Thorsten

    Fictional Exoplanet creation

    Yes - that's what I'm trying to say here - it's more complicated than that if you have high absorption, then you don't have a single effective photosphere but many - each with its own window - and for that you need a radiation transport code. But... you still need to go through lineshapes...
  9. Thorsten

    Fictional Exoplanet creation

    So, how does one go about and estimate the magnitude of the Greenhouse effect from an atmosphere composition, how do the two tie together? The basics of the Greenhouse effect are energy is radiated to the ground primarily in optical wavelength to which the atmosphere is transparent the ground...
  10. Thorsten

    Fictional Exoplanet creation

    But at what timescale? There's much more energy stored in orbital motion than in rotation, so it must take longer to dampen that. The calculation at least assumes a significantly higher internal heat flux (combined with more volcanism) than Earth, so yes, I agree there'd be tidal heating -...
  11. Thorsten

    Fictional Exoplanet creation

    As mentioned before, the thermal inertia is a somewhat important ingredient. Now, it isn't hard to find out the heat capacity of rock - but the main question is how deep into the ground rock (water,...) participates in the thermal evolution. Since fundamentally heat is transported inside the...
  12. Thorsten

    Fictional Exoplanet creation

    Well, that I haven't really been interested in doing automatically. Geology is complicated, one needs to work out what processes form the land - was it formed by ice or volcanism? Vegetation is complicated, one needs to work out how the weather and climate is in different places - do plants grow...
  13. Thorsten

    Fictional Exoplanet creation

    Even in the shortest period cases, Coriolis forces are at best 1/20 of what they are on Earth (under Stormhold assumtions ~1/50 of Earth) - that's not a significant deflection of any airmass, so to good approximation the symmetry is rotational around the subsolar point, and the equator is just...
  14. Thorsten

    Fictional Exoplanet creation

    It's a common misconception that you'd need much Coriolis forces to get a cyclone - conservation of angular momentum will easily suffice to spin it up (as you can easily verify by pulling the plug on a bathtub - Coriolis force across a few cm is negligible, and yet the water spins merrily) and...
  15. Thorsten

    Fictional Exoplanet creation

    I've long been interested in working out the how planets elsewhere in space might actually be. We can't know of course, but the more I've been thinking, the more I realized that we still can have a pretty good idea by applying science what can be and what can't. So over the years I've been...
  16. Thorsten

    Making Movies

    For those following the Cliodhna-series, we finally managed to produce episode VII - 'the Troll Hoard' Enjoy!
  17. Thorsten

    Numerical Epidemics

    repeat { vaccinate() } until (new_infections < lower_limit);
  18. Thorsten

    Numerical Epidemics

    For anyone still interested, we've now reached the next version. I've added the capability to propagate different virus strains on the same grid so that one can see how they interact with each other. Here's an example of a standard strain (violet) being contained by a measure, at which point a...
  19. Thorsten

    News The Space Shuttle for Flightgear 3.6

    The new version of the FG Space Shuttle Flight Manual corresponding to the milestone 13 is out - get your updated copy here!
  20. Thorsten

    Docked at the ISS for the first time!

    Without any claim to this being a real procedure: Patience and discipline - the LVLH frame rotates fairly slowly. Ideally you align one axis with it so you only need to correct that axis. While you do your translation maneuvers, you remember to switch to rotation every two minutes or so and...
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