Thermal processes in our Earth model as functions of altitude. In the upper panel, the red line shows the total XUV, chemical, and Joule heating, the blue line shows the total IR cooling, the cyan and magenta lines show the neutral heating by collisions with electron and ions, the black line shows the sum of all of these, and the green line shows the effects conduction. In the middle and lower panels, we show the contributions of individual mechanisms to the total heating and cooling.