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Title: Structures of the fluctuation precursor in an active explosive ionospheric experiment

Abstract

Results are presented from processing the measurement data on low-frequency fluctuations from the North Star active explosive ionospheric experiment. The fluctuation precursor signal was processed by the wavelet analysis method. The structures revealed are identified as ion acoustic envelope solitons.

Authors:
 [1]
  1. Russian Academy of Sciences, Institute of Geosphere Dynamics (Russian Federation)
Publication Date:
OSTI Identifier:
21100175
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 33; Journal Issue: 5; Other Information: DOI: 10.1134/S1063780X07050054; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ATMOSPHERIC EXPLOSIONS; FLUCTUATIONS; IONOSPHERE; PRECURSOR; PROCESSING; SIGNALS

Citation Formats

Kovaleva, I. Kh.. Structures of the fluctuation precursor in an active explosive ionospheric experiment. United States: N. p., 2007. Web. doi:10.1134/S1063780X07050054.
Kovaleva, I. Kh.. Structures of the fluctuation precursor in an active explosive ionospheric experiment. United States. doi:10.1134/S1063780X07050054.
Kovaleva, I. Kh.. Tue . "Structures of the fluctuation precursor in an active explosive ionospheric experiment". United States. doi:10.1134/S1063780X07050054.
@article{osti_21100175,
title = {Structures of the fluctuation precursor in an active explosive ionospheric experiment},
author = {Kovaleva, I. Kh.},
abstractNote = {Results are presented from processing the measurement data on low-frequency fluctuations from the North Star active explosive ionospheric experiment. The fluctuation precursor signal was processed by the wavelet analysis method. The structures revealed are identified as ion acoustic envelope solitons.},
doi = {10.1134/S1063780X07050054},
journal = {Plasma Physics Reports},
number = 5,
volume = 33,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • On two separate evenings in September 1982, rockets were launched into the bottomside equatorial F{sub 2} region off the coast of Natal, Brazil, to inject chemicals, consisting of mainly H{sub 2}O and CO{sub 2}, to create a hole in ionization. The chemicals were injected near the height where the density gradient was steepest, and at a time when the F{sub 2} region was rising rapidly to see whether plasma bubble irregularities could be generated from instabilities triggered by the ionization hole. On both occasions, hole-induced depletions in total electron content (TEC) of more than 10{sup 16} el/m{sup 2} were observedmore » over horizontal distances of at least 60 km from the chemical injection point. The eastward drifts of these artificial depletions were observed by the time difference in the TEC features observed at various TEC monitoring stations, and from the changing range of oblique ionosonde echoes observed by an ionosonde located 300 km magnetically east of the chemical release point. Their subsequent evolution into plasma bubble irregularities was demonstrated from the observations of spread F echoes, strong amplitude scintillation, and TEC depletion at distances of from 300 to 500 km eastward of the release points. The fact that similar behavior of the ionosphere was observed during the evenings of both rocket chemical releases, and on no other nights of the campaign, is strong evidence of successful artificial generation of bubble irregularities by chemical injection into the bottomside F{sub 2} region.« less
  • The conditions are studied under which stable ion acoustic envelope solitons propagating perpendicular to the magnetic field lines can exist in the ionospheric plasma. The amplitudes, frequencies, and lengths of the waves are determined. The results obtained are compared with the experimental data. It is suggested that such solitons play an important role in both the formation of an ionization front and its motion across the magnetic field and also give rise to a fluctuation precursor in explosive ionospheric experiments.