Early Trimpi events from lightning-induced electric fields in the ionosphere - An alternative explanation

Computer Science – Sound

Scientific paper

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Atmospheric Electricity, Earth Ionosphere, Electric Fields, Ionospheric Cross Modulation, Lightning, Atmospheric Models, Atmospheric Physics, High Energy Electrons, Sounding Rockets, Trapped Particles, Very Low Frequencies

Scientific paper

Two classes of 'Trimpi' modulation of VLF signals in the earth-ionosphere waveguide have been identified in the literature. The more common type occurs 1 s or more after causative lightning strokes, the second in less than 100 ms. The possibility that these early Trimpi events result from lightning-generated, electric field impulses lowering the mirror altitudes of trapped electrons is examined. To overcome the mirror force on energetic electrons, upward-directed electric fields with strengths of a few tens of mV/m are required. This is well within the range of electric fields observed on sounding rockets above thunderstorms.

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