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Modulation of auroral field‐aligned electron fluxes under two inverted‐V structures at different altitudes

This paper presents observations of field‐aligned electron flux bursts from the auroral sounding rocket flight, Alaska 2000, launched February 25, 2000 from Poker Flat, Alaska. In one particular energetic electron burst, the field‐aligned electron flux is observed to be modulated at 22–30 Hz at energies up to 30 keV. By assuming that the observed energy dispersion in the bursts is caused by time‐of‐flight effects, we obtain characteristic source altitudes of 87 dispersive electron bursts, and find that the average characteristic source altitude of the bursts is 4015 ± 684 km in the first inverted‐V and 5411 ± 972 km in the second inverted‐V. This result implies that the electron‐wave or other interaction depends more strongly on which arc it occurs in, rather than another factor such as energy of the electrons, since dispersive bursts at a wide range of energies and durations were used to arrive at the result.