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Recent theoretical work shows that "electron exhausts", elongated regions ofdepleted electron density shown by PIC codes to be generated in collisionlessreconnection, can in principle become sources of X-mode Auroral KilometricRadiation generated by the electron cyclotron maser instability (ECMI). In thispaper it is suggested that under certain conditions such X-mode AKR canpossibly be transported down along the auroral magnetic flux tubes to lowaltitudes, in extreme cases even penetrating below the ionospheric F- andE-regions to reach ground level. The characteristic features of low-altitudeAKR produced and transported by this mechanism would be bandwidths of order$\sim$100 kHz and occurrence in quasi-periodic bursts lasting $< 1$ s whenpassing at full Alfv\'en speed, $>1$ s when retarded. Most publishedobservations of low-altitude AKR have insufficient time resolution to detectthese features, although a few are suggestive of them. The few observationswith marginally sufficient time resolution are so far neither consistent norinconsistent with these predictions, suggesting that occasions when electronexhausts transport AKR all the way to low altitudes may be rare. However,vigorous experimental effort to test these theoretical predictions is warrantedbecause of its physical and astrophysical significance. They would also providean additional method to remotely detect and investigate reconnection physics.

Sub-ionospheric AKR: A possible mechanism for its transport down from the topside generation region to the F layer and ground