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We investigated the relationship between low-frequency (0.2-4.0 Hz)electric-field fluctuations (LEFs) and ion conics around the daysidecusp/cleft region in the altitude range from 5000 to 10000km fromobservations made by the Akebono satellite. Ion conics were generallyassociated with intense LEFs. We found a significant correlation between thepower spectral density of LEFs at any frequency and the energy ofsimultaneously observed ion conics. Ion conics with a conic angle near90 deg and those more aligned with magnetic field lines both had anequivalent correlation with the local intensity of the LEFs. The LEFs associatedwith near-perpendicular ion conics were, however, generally more intense thanthose associated with folded conics. The difference was clearer forlow-energy conics. These results are in agreement with a scenario ofheight-integrated heating of ions and energization of ions by electromagneticenergy supplied by local LEFs. Ions generally stay in the energization regionduring their upward motion along the field line, so that more folded ionconics with weak energization reach the same energy level asnear-perpendicular conics with strong energization, due to the difference inintegration time. The limit on residence time in the intense heating regioncauses the clearer difference for low-energy conics. We set up a simple modelto examine the relationship between the energization rate and the evolutionof ion conics along the field lines, and obtained good agreement with theobservation results

Relationship between low-frequency electric-field fluctuations and ion conics around the cusp/cleft region