Computer Science – Sound
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..205b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Feb. 1992, p. 205-208.
Computer Science
Sound
10
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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