One can reasonably expect that when kilovolt electron currents impact the atmosphere and stimulate atoms to emit the spectral lines associated with aurora, that some thermal energy must also be produced from inter-atomic collisions. You would expect that this low energy thermal emission comes out mainly in the rotational and vibrational energy of the molecules of oxygen and nitrogen in the infrared band. The problem is that symmetric molecules like o2 and n2 have rather weak rotational and vibrational 'bands' so the molecules tend not to cool off very efficiently in the infrared by line emission. This means that most of the thermal energy they receive remains as mostly kinetic energy, so aurora cause the upper atmosphere to heat-up. I know of no instances where aurora have been 'imaged' or otherwise detected in the infrared bands from the ground.