Abstract

Previous observational studies indicate that the energies of different ion species in ion conics produced by broad‐band extremely low frequency (BBELF) waves are nearly equal. In contrast, theoretical studies predict a definite preferential acceleration for heavy ions over lighter ions. We show that this discrepancy can be resolved if a downward parallel electric field is present in the heating region: for a sufficiently strong electric field ions of different masses acquire approximately the same energy in escaping the trapping region.

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