QUOTE (deglr6328 @ May 9 2005, 04:58 PM)
The
other THEMIS mystery images...
About 2 years ago there was a (minor) to do about some images taken by THEMIS in the Hellas basin region which seemed to
show anomalously high surface temperatures at night. (I hate linking to New Sensationalist but they have that cool picture...) U. Melbourne geologist Nick Hoffman seemed to think they were "
ice towers", geothermal vents under the ice pack. Then, I never heard another thing about it. I would think that this being (so far as I know) the only thermal anomaly odyssey has found, it would be investigated further. This was one of the reasons for sending mid/far IR imagers, right? It is worth noting that the
person behind the ice tower theory is the same guy who staunchly stands by his conviction of a completely dry Mars. The so called "white mars" theory, where all geologic weathering conventionally atributed to past water flow is, in his model, attributed to "non-conventional volatile models" eg. CO2 liquid flow. It would seem that with the new overwhelming evidence for water provided by the MERs that this theory should be dead and buried. His website hasn't been updated since the gusev landing. Oh, and good luck trying to slog through all the conspiracist crap on this one in order to find real information. It's not easy or fun.
This was a silly fuss about nothing. Hoffman originally thought he found some "vents" that were +20C to +40C over their surroundings, however it turns out that he was simply unable to read the data properly. What he "found" was a couple of small (~500m) warm spots (+8 degC), however that's not at all surprising, since there are places all over mars where there's exposed rock outcroppings that are +10C to +15C warmer than their surroundings.
In reality, THEMIS hasn't found even the slightest hint of active hydrothermal or volcanic activity.