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Here's a prototype I'm working on. It isn't finished yet :



In this case, all particles have an initial velocity of 45% escape velocity on Io (v_escape = 2.56 km/sec). I'll make the curved paths randomized, with some fading on their end so they look more "natural" (it's obviously too symetric on this picture). Take note that the trajectories are modelised using Mathematica to solve Newton's equation with Io's real gravity. I'll randomize the initial velocity too.

The final model should be pretty small (around 300 KB, in binary CMOD).

Wait... is this a static model you're working on?

Dollan wrote:Wait... is this a static model you're working on?

Yes, of course. There's no way I can make an animated model of the real thing. But I think this isn't really a problem.

I need some documents on the typical velocity of the ejected material from an Io volcano. Is that "plume" too big ?



The initial velocity was set in this case to 30% V_escape.

I'm trying to figure out the typical initial velocity of the material, before randomize the initial velocities using a gaussian distribution.

There are three parameters to randomize in this model : the initial velocity, the inclination angle (theta) and the azimuthal angle (phi). I'll also give some fade out effect to each trajectory, like what I've done for my charged particles in a magnetic field (that's the most difficult part in this kind of modeling).

Cham wrote:Is that "plume" too big ?

It actually looks pretty close to this:

Cham wrote:I need some documents on the typical velocity of the ejected material from an Io volcano. Is that "plume" too big ?.

Cham, except for the color, it looks very close to the one shown in this NASA movie:
http://www.digitalradiance.com/sng/Io_volcano.htm
It's a 3D simulation of Io's Pillan Patera sulfur volcano.
The QuickTime movie is 375 KB.
Hope this helps.
BTW your solution looks very interesting, much better than using a comet to simulate the volcanic plume, like I'm doing now.
Thank you for this new possibility.
Bye

Andrea

Thanks Andrea. Of course, the color is temporary and will be changed at the last stage. I'm wondering about that blue color we see almost everywhere on the web, for Io's plumes. Is that the real color ?

Cham wrote:Thanks Andrea. Of course, the color is temporary and will be changed at the last stage. I'm wondering about that blue color we see almost everywhere on the web, for Io's plumes. Is that the real color ?

Well, even if I'm not a geologist, I well know that when solid it has a pale yellow or brown color, and when it is lighted emits a very intense blue light, so... Io eruptions are of liquid or lighted sulphur?
Considering that sulphur melts on Io at 177?°C, and the mean surface temperature is -143?°C, the blue light could be only due to sulphur reaching the Io surface already lighted.
But Ionian activities are very strange and still unclear, if we think that Galileo found Io surface temperatures up to 1500?°C, and that in this paper, from the Instituto de Astrophisica de Canarias
http://www.astroscu.unam.mx/rmaa/RMxAC. ... -luis2.pdf
many other aspects are submitted for investigation (silicates together with sulphur, unexplained temperatures, impossible to be reached taking into account only the tidal forces due to the very close Jupiter, etc.)
Fascinating, isn't it?
BTW, here is another movie (this time real, not a simulation) with Io's volcano erupting, with the usual blu color plume:
http://www.solarviews.com/raw/jup/vio2.mov
Bye

Andrea

Talking of real Io volcano movies, have you seen this one from New Horizons? It could be the coolest thing ever.

http://www.planetary.org/blog/article/00000972/

I'm experiencing some nasty problems with the statistics package of Mathematica. I'm yet unable to do proper randomization

I should be able to add the fading effect on the trajectories (plume like rendering). I'll place two of these for the "Pele" and "Prometheus" volcanoes.

Some views of the actual model (it's only a 150 KB file in binary CMOD) :

Cham wrote:I'm experiencing some nasty problems with the statistics package of Mathematica. I'm yet unable to do proper randomization
I should be able to add the fading effect on the trajectories (plume like rendering). I'll place two of these for the "Pele" and "Prometheus" volcanoes.
Some views of the actual model (it's only a 150 KB file in binary CMOD) :

Cham, could it be possible to add another cmod file to the actual one (same position), smaller and with thicker and closer white lines, in order to simulate the brightest part of the plume?
I know absolutely nothing of cmods, so probably this is impossible, otherwise...
Bye

Andrea

ANDREA wrote:Cham, could it be possible to add another cmod file to the actual one (same position), smaller and with thicker and closer white lines, in order to simulate the brightest part of the plume?
I know absolutely nothing of cmods, so probably this is impossible, otherwise...

This is CERTAINLY possible, Andrea (and actually, this should be pretty easy). But do you have some pictures to support your idea, so I could have a better idea of what it should look like ?

Rhaaa ! The randomization is MUCH harder to do than what I presumed. I'm unable to get a good looking result. Today, I hate Mathematica !



I may end with the symetric model (without any randomization), as just a symbolic (or schematic) representation of the Pele and Epimetheus volcanoes.

The symmetric model is good enough

For the record, the Pele and Prometheus plumes should obviously be different sizes, with the Prometheus-type plumes reaching 75-100 km above the surface. The plume "particles" should land 100-150 km from the vent. These should be located at Prometheus, Amirani, and Masubi. Pele-type plumes reach 350-400 km above the surface. The plume particles should land 500-600 km from the plume vent. These should be located at Pele and Tvashtar.

The plumes are blue from the small dust particles in the plume.

volcanopele wrote:For the record, the Pele and Prometheus plumes should obviously be different sizes, with the Prometheus-type plumes reaching 75-100 km above the surface. The plume "particles" should land 100-150 km from the vent. These should be located at Prometheus, Amirani, and Masubi. Pele-type plumes reach 350-400 km above the surface. The plume particles should land 500-600 km from the plume vent. These should be located at Pele and Tvashtar.

Thanks for the information. I just measured my first model, and the particles are landing at about 120 km from the volcano center, and reach an altitude of about 65 km. This is very close to the Prometheus-type. The initial velocity was set to 20% V_escape, in my simulation.

For the Pele-type, I'll have to double the initial velocity.

Thanks again. That's the kind of information I need for those models.

Here are four snapshots of the latest model (for the Prometheus type), with its smooth shades of colors and transparencies. The red part is probably too strong. The color variation could be adjusted easily. I'll add more "jets" on that one. Or maybe I should try to make an ordinary 3ds mesh, instead of a mathematical model (?).

Do you think a 3ds model like this is better than the previous CMOD version ?

For my judge, that with the two red-blue color is the best. A vulcan that eject particles for kilometers will be strong "reddish" in a certain way. An answer about the animate question: should be possible animate some particles with the xyz trajector builder so that these flows away from the beneath of the surface and then return down to it, assumes these movements continues? Or the xyz values are only for long and linear run?

Cham wrote:Do you think a 3ds model like this is better than the previous CMOD version ?

Cham, I don't agree with Fenerit opinion, the red has never been shown in any image, so I think that the final solution could be a mix like this:
a- bicolored field lines, but white in the inner and blu in the outer;
b- moreover coadded to the 3d model, if this is possible.
IMHO this would give following benefits:
1- colors matching ALL the images obtained up to now (i.e. with interior white and exterior blu);
2- the volume given by the 3D model, that will "fill" the gaps among the various field lines.
Can you make a try, just to see if the result is as I think?
Thanks a lot.
Bye

Andrea

Andrea, if white, then more hottest than red...