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Temporal evolution of very strong Trimpis observed at Darwin, Australia
Author(s) -
Dowden Richard L.,
Brundell James B.,
Rodger Craig J.
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl02357
Subject(s) - amplitude , physics , sprite (computer graphics) , logarithm , phase (matter) , ionosphere , darwin (adl) , exponential function , signal (programming language) , astrophysics , computational physics , geophysics , optics , quantum mechanics , mathematics , computer science , computer vision , mathematical analysis , systems engineering , programming language , engineering
Very strong phase and amplitude perturbations (Trimpis) of the very strong VLF transmission from NWC received in Darwin, Australia, enabled accurate measurement of the amplitude and phase of the scattered signal and of the time variation of these. The amplitude of the scattered signal decays as the logarithm of time, quite at odds with the exponential decay observed on classic Trimpis. During the amplitude decay, the phase of the scattered signal decreased at a decreasing rate. This is shown to be consistent with scattering from a bundle of sprite‐like, conducting columns extending some 50 km below the base of the ionosphere.