Abstract
We have studied the extent to which diffusion-thermal heat flow affects H + temperatures in the high-latitude topside ionosphere. Such a heat flow occurs whenever there are H +−O + relative drifts. From our study we have found that at high-latitudes, where H + flows up and out of the topside ionosphere, diffusion-thermal heat flow acts to reduce H + temperatures by 500–600 K at altitudes above about 900 km.
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