QUOTE (john_s @ Sep 12 2008, 11:09 AM)
One fundamental difference- the Great Red Spot and similar storms on Jupiter are anticyclonic (high-pressure), not cyclonic (low-pressure) like terrestrial hurricanes.
Actually, hendric, I'm really, really glad you asked this question. This is something that's been bothering me for quite a while now, hopefully someone can set me straight.
Most hurricanes have surface lows (inflow), but upper level highs (outflow). The cumulonimbus clouds trace out the inflow and convective bands. The upper atmosphere divergence strengthens the lower level convergence. (All that humid air's gotta go somewhere). I'm not sure, but I think upper level outflow might be observable by examining the fine structure in the water vapor loop imagery over time using a rotating coordinate frame (another project for Spin-O-Vision).
Here's the best site I've found to explain hurricane structure (use the tab in the window to scroll through):
http://www.newmediastudio.org/DataDiscover...urr_Struct.html"Upper level flow and the anticyclonic jet. As air leaving the center of the hurricane reaches an elevation of about 12 km above sea level (200 mb level), it produces high pressure near the tropopause, and divergent flow away from the focus of the hurricane. This upper level outflow circulates in an anticyclonic direction, typically at a radius of 300 km, and is termed the anticyclonic jet. "What I'm wondering (and honestly don't know), is if the upper level outflow (anti-cyclone) we see from the Great Red Spot is coupled to a lower level low pressure system. Could it be that the Great Red Spot is a super-thick big hurricane, with the cyclonic bands hidden way down deep, but the upper level anticyclonic bulge evidenced by the high dark red cloud layers?
-Mike