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Title: Theoretical Studies of Low Frequency Instabilities in the Ionosphere. Final Report

Abstract

The objective of the current project is to provide a theoretical basis for better understanding of numerous radar and rocket observations of density irregularities and related effects in the lower equatorial and high-latitude ionospheres. The research focused on: (1) continuing efforts to develop a theory of nonlinear saturation of the Farley-Buneman instability; (2) revision of the kinetic theory of electron-thermal instability at low altitudes; (3) studying the effects of strong anomalous electron heating in the high-latitude electrojet; (4) analytical and numerical studies of the combined Farley-Bunemadion-thermal instabilities in the E-region ionosphere; (5) studying the effect of dust charging in Polar Mesospheric Clouds. Revision of the kinetic theory of electron thermal instability at low altitudes.

Authors:
Publication Date:
Research Org.:
National Science Foundation (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
824535
Report Number(s):
DOE/ER/54569
TRN: US200503%%753
DOE Contract Number:
AI02-00ER54569
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 20 Aug 2003
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; CLOUDS; DUSTS; E REGION; ELECTRONS; HEATING; INSTABILITY; IONOSPHERE; KINETICS; RADAR; ROCKETS; SATURATION

Citation Formats

Dimant, Y. S.. Theoretical Studies of Low Frequency Instabilities in the Ionosphere. Final Report. United States: N. p., 2003. Web. doi:10.2172/824535.
Dimant, Y. S.. Theoretical Studies of Low Frequency Instabilities in the Ionosphere. Final Report. United States. doi:10.2172/824535.
Dimant, Y. S.. Wed . "Theoretical Studies of Low Frequency Instabilities in the Ionosphere. Final Report". United States. doi:10.2172/824535. https://www.osti.gov/servlets/purl/824535.
@article{osti_824535,
title = {Theoretical Studies of Low Frequency Instabilities in the Ionosphere. Final Report},
author = {Dimant, Y. S.},
abstractNote = {The objective of the current project is to provide a theoretical basis for better understanding of numerous radar and rocket observations of density irregularities and related effects in the lower equatorial and high-latitude ionospheres. The research focused on: (1) continuing efforts to develop a theory of nonlinear saturation of the Farley-Buneman instability; (2) revision of the kinetic theory of electron-thermal instability at low altitudes; (3) studying the effects of strong anomalous electron heating in the high-latitude electrojet; (4) analytical and numerical studies of the combined Farley-Bunemadion-thermal instabilities in the E-region ionosphere; (5) studying the effect of dust charging in Polar Mesospheric Clouds. Revision of the kinetic theory of electron thermal instability at low altitudes.},
doi = {10.2172/824535},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 20 00:00:00 EDT 2003},
month = {Wed Aug 20 00:00:00 EDT 2003}
}

Technical Report:

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  • The primary purpose of this work was to investigate the possibility of obtaining a relatively inexpensive method for the controlled artificial generation of ultra-low-frequency (ULF-frequencies less than 5 Hz) geomagnetic pulsations. Because of the great penetration of these signals in sea water, the controlled artificial source could conceivably be used as a transmitter to communicate with deeply submerged receivers at a low data rate. A second purpose of the work was to investigate the feasibility of using airborne loop antennas for air/undersea communication at ULF. The following are the major conclusions of this work; (1) The controlled artificial generation ofmore » ULF geomagnetic pulsations by the 'peninsula method,' i.e., by the passage of a ULF-modulated electric current around a relatively nonconducting peninsula in the sea or in a large saline lake, is feasible and further experiments, in particular, a fullscale ULF wave generation experiment, appear desirable. (2) The controlled artificial generation of ULF geomagnetic pulsations by the 'VLF method,' i.e., by the injection of ULF-modulated VLF signals into the magnetosphere from a large ground-based VLF transmitter, appears possible, but further theoretical and experimental studies are required to clarify the generation mechanism.« less
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  • The final report summarizes the work accomplished under the subcontract. The overall objectives for the investigation were as follows: The determination of molecular properties of chemical dynamics for reactions of importance to combustion and propulsion. Molecular beam techniques were used for the experimental part of this work and were accompanied by theoretical studies in chemical dynamics. The second purpose was the study of the interaction of chemical reactions with transport processes and flows in gases in which instabilities may occur. (Author)
  • The objective of this work was to evaluate the effectiveness of transtracheal jet ventilation in organophosphate-challenged animals. Preliminary studies were done in normal canines to define the effects of ventilator operating parameters on respiratory gas exchange. Nine normal dogs, anesthetized with sodium pentobarbital, were ventilated through an eight gauge cricothyrotomy cannula using a controller that allowed separate setting of drive pressure, duty cycle, and frequency. Arterial (partial pressure of oxygen) and (partial pressure of carbon dioxide) were measured after achieving steady state gas exchange at 15-22 different combinations of drive pressure, duty cycle, and frequency in each dog. There weremore » slight increases in PaCO2 and larger decreases in arterial oxygen partial pressure as frequency was increased from 10 to 200 cycles/min. Increases in drive pressure and duty cycle resulted in reductions in PaCO2 and increases in PaO2.« less