Dry Adiabiatic Lapse Rat2

Dry Adiabiatic Lapse Rat2 - Dry Adiabiatic Lapse Rate In...

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Dry Adiabiatic Lapse Rate In the thermosphere the main heat input is the dissociation of molecular oxygen, which creates atomic oxygen carrying the excess energy of the dissociation reaction, and absorption of quanta of radiation by atomic oxygen which are not energetic enough to ionize it. Since O is a poor radiator, the O is a poor radiator, the temperature builds up to 100s K or 1000s K. The main heat loss is by conduction down to the mesopause (though it has very little effect on the temperature there since the density of the thermosphere is so small compared to that of the lower atmosphere). Since the heating is due to EUV and XUV this is very solar cycle dependent. You will see above that the thermosphere has a small day-night variation, but a large solar-cycle variation. This ties in with what we noted above about solar cycle variation of the different wavelengths of solar emissions. The main bulk of solar radiation barely varies at all over a solar cycle, which is why the ground temperature does not vary much. The EUv - and even more so
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