Seasonal and solar cycle dependences of the correlation between auroral kilometric radiation and the AE index

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Seasonal and solar cycle dependences of the correlation between auroral kilometric radiation (AKR) and the auroral electrojet (AE) index have been investigated based on the plasma wave data obtained by the Akebono satellite. Under any seasonal and solar activity conditions, a clear correlation has been found between the AKR power flux and the AE index. The properties of the correlation, however, vary depending on season and solar activity. AKR power flux increases as about the 1.2 power of AE index in all seasonal and solar activity conditions. However, even for the same AE index, AKR power flux during solar minimum is 5dB larger than that during solar maximum. As for the seasonal variations, the AKR power flux in winter is 22dB larger than that in summer even for the same AE index. The results suggest that long-term variations of AKR depend not only on auroral current variations but also on factors associated with the total energy flux of auroral electrons and the generation process of AKR.