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" ... If he were flying above the North Pole of Mars, my advice to Santa would be 'Hang tight onto your reins,'" said Odyssey navigator John C. Smith. "You could be in for a rough ride."In the midst of aerobraking maneuvers that are lowering the spacecraft's orbit around Mars, the Odyssey team has discovered an unexpected and somewhat unpredictable north polar atmospheric disturbance that is making the job a real adventure, Smith said......Called the "polar vortex," this cold, low density region forms each winter in the atmosphere above the planet's latitudes 70 degrees north and higher. The region between the polar vortex and the rest of the atmosphere is called the 'transition zone.' In this zone, strong winds swirl around the pole and the zone itself weaves in and out in the typical fashion of a terrestrial jet stream. It is an area where sometimes surprising shifts in the atmospheric density can become fasten-your-seatbelt territory for Odyssey. ... "