Green's function for a switched plasma medium and a perturbation technique for the study of wave propagation in a transient plasma with a small rise time
Summary form only given. The main effect of switching a medium (creating a temporal discontinuity in the properties of a medium) is the splitting of the source (incident) wave into new waves whose frequencies are different. Lightning induced effects in the ionosphere cause a temporary enhancement of...
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Published in | IEEE Conference Record - Abstracts. 1996 IEEE International Conference on Plasma Science p. 186 |
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Main Author | |
Format | Conference Proceeding |
Language | English |
Published |
United States
IEEE
1996
Institute of Electrical and Electronics Engineers, Inc., Piscataway, NJ (United States) |
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Abstract | Summary form only given. The main effect of switching a medium (creating a temporal discontinuity in the properties of a medium) is the splitting of the source (incident) wave into new waves whose frequencies are different. Lightning induced effects in the ionosphere cause a temporary enhancement of ionization. Such transient plasmas have a time-varying plasma frequency /spl omega//sub p/(t) with a rise time T/sub r/. If the period t/sub 0/ of a source wave existing before the transient effect begins is much larger than the rise time, the ionization change may be idealized as a sudden switching of the medium. The solution to this initial value problem with a step-change in the electron density profile is known and this profile will be considered as a reference profile. The switching action gives rise to a reflected wave (propagating in the opposite direction to that of the source wave) and a transmitted wave at an upshifted frequency /spl omega//sub 2/=(/spl omega//sub 0//sup 2/+/spl omega//sub p//sup p/). The topic of this paper is the solution of the initial value problem when t/sub 0/ is comparable to the rise time T/sub r/. |
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AbstractList | The main effect of switching a medium (creating a temporal discontinuity in the properties of a medium) is the splitting of the source (incident) wave into new waves whose frequencies are different. Lightning induced effects in the ionosphere cause a temporary enhancement of ionization. Such transient plasmas have a time-varying plasma frequency {omega}{sub p} (t) with a rise time T{sub r}. If the period t{sub 0} of a source wave existing before the transient effect begins is much larger than the rise time, the ionization change may be idealized as a sudden switching of the medium. The solution to this initial value problem with a step-change in the electron density profile is known and this profile will be considered as a reference profile. The topic of this paper is the solution of the initial value problem when t{sub 0} is comparable to the rise time T{sub r}. The initial motivation for investigating the problem is given below. There is considerable interest in the ionospheric physics community to investigate the recently discovered Sprites phenomenon which are red emissions in the lower D region induced by the lightning discharges from a cloud to the ground. The preliminary indications are that the Sprite is a plasma with electron density enhanced by about 10{sup 1} to 10{sup 3}/cc in a rise time of about 100 {micro}s. Summary form only given. The main effect of switching a medium (creating a temporal discontinuity in the properties of a medium) is the splitting of the source (incident) wave into new waves whose frequencies are different. Lightning induced effects in the ionosphere cause a temporary enhancement of ionization. Such transient plasmas have a time-varying plasma frequency /spl omega//sub p/(t) with a rise time T/sub r/. If the period t/sub 0/ of a source wave existing before the transient effect begins is much larger than the rise time, the ionization change may be idealized as a sudden switching of the medium. The solution to this initial value problem with a step-change in the electron density profile is known and this profile will be considered as a reference profile. The switching action gives rise to a reflected wave (propagating in the opposite direction to that of the source wave) and a transmitted wave at an upshifted frequency /spl omega//sub 2/=(/spl omega//sub 0//sup 2/+/spl omega//sub p//sup p/). The topic of this paper is the solution of the initial value problem when t/sub 0/ is comparable to the rise time T/sub r/. |
Author | Kalluri, D.K. |
Author_xml | – sequence: 1 givenname: D.K. surname: Kalluri fullname: Kalluri, D.K. organization: Dept. of Electr. Eng., Massachusetts Univ., Lowell, MA, USA |
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Snippet | Summary form only given. The main effect of switching a medium (creating a temporal discontinuity in the properties of a medium) is the splitting of the source... The main effect of switching a medium (creating a temporal discontinuity in the properties of a medium) is the splitting of the source (incident) wave into new... |
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StartPage | 186 |
SubjectTerms | Capacitors D REGION Electromagnetic radiation ELECTRON DENSITY Electrons Frequency Green's function methods Ionization IONOSPHERIC EFFECTS LIGHTNING Perturbation methods PERTURBATION THEORY PHYSICS PLASMA DIAGNOSTICS Plasma properties Plasma sources Plasma waves |
Title | Green's function for a switched plasma medium and a perturbation technique for the study of wave propagation in a transient plasma with a small rise time |
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