Full-wave solution of short impulses in inhomogeneous plasma

Ferencz, Orsolya E.

doi:10.1007/bf02704879

Cited by 4 publications

(8 citation statements)

References 3 publications

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“…The subsequent propagation of an impulse in the magnetoionic medium, excited by a tweek at the lower ionosphere was modelled. For this step the analytical UWB solution of wave propagation in case of arbitrarily inhomogeneous plasmas (Ferencz, 2005), or the full wave solution of an oblique impulse propagation , can be applied. Note that the waveforms of short-path fractionalhop whistlers, acquired at LEO altitudes, are most accurately described assuming an oblique, nonducted propagation in the ionospheric plasma.…”

Section: Tweek and Spw: Numerical Results Of A Full-wave Solution Comentioning

confidence: 99%

“…The detailed description of the analytical real UWB solution of signal propagation in an arbitrarily inhomogeneous anisotropic plasma can be found in Ferencz (2005), based on the results of the solution of monochromatic propagation (Ferencz, 2004b). We concentrate in the following on the results of numerical simulations of subionospheric tweek waveforms and on modeled SpW signals excited by tweeks, according to the schematic in Fig.…”

Section: Modelling and Interpretation Theoretical Backgroundmentioning

confidence: 99%

“…The general, exact full-wave solutions of Maxwell's equations for guided propagation of short, UWB impulses (Ferencz, 2004a;Ferencz and Ferencz, 2004), as well as for UWB signal propagation in linear, inhomogeneous magnetoionic media (Ferencz et al, 1996Ferencz, 2005), were applied in this investigation.…”

Section: Modelling and Interpretation Theoretical Backgroundmentioning

confidence: 99%

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The effect of subionospheric propagation on whistlers recorded by the DEMETER satellite – observation and modelling

Ferencz¹,

Ferencz²,

Steinbach

et al. 2007

Ann. Geophys.

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Abstract. During a routine analysis of whistlers on the wideband VLF recording of the DEMETER satellite, a specific signal structure of numerous fractional-hop whistlers, termed the "Spiky Whistler" (SpW) was identified. These signals appear to be composed of a conventional whistler combined by the compound mode-patterns of guided wave propagation, suggesting a whistler excited by a lightning "tweek" spheric. Rigorous, full-wave modelling of tweeks, formed by the long subionospheric guided spheric propagation and of the impulse propagation across an arbitrarily inhomogeneous ionosphere, gave an accurate description of the SpW signals. The electromagnetic impulses excited by vertical, preferably CG lightning discharge, exhibited the effects of guided behaviour and of the dispersive ionospheric plasma along their paths. This modelling and interpretation provides a consistent way to determine the generation and propagation characteristics of the recorded SpW signals, as well as to describe the traversed medium.

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Section: Tweek and Spw: Numerical Results Of A Full-wave Solution Comentioning

confidence: 99%

Section: Modelling and Interpretation Theoretical Backgroundmentioning

confidence: 99%

Section: Modelling and Interpretation Theoretical Backgroundmentioning

confidence: 99%

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The effect of subionospheric propagation on whistlers recorded by the DEMETER satellite – observation and modelling

Ferencz¹,

Ferencz²,

Steinbach

et al. 2007

Ann. Geophys.

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“…Also, MR‐type reflection cannot occur in this region. The other possibility is the reflection caused by a density gradient can also be excluded, because this reflection produces a significantly different signal pattern [see Ferencz , 2005, Figure 2].…”

Section: Discussionmentioning

confidence: 99%

An unusual VLF signature structure recorded by the DEMETER satellite

et al. 2010

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[1] A type of electromagnetic phenomenon has been found in the electric VLF data measured by the low Earth orbit DEMETER satellite, which was nonidentified earlier as a different class of electromagnetic VLF events. The phenomenon, termed as "swallowtailed whistler" (STW) after its shape, seems to be similar to a whistler, but following the main trace, an additional trace appears with monotonously increasing frequency. The secondary trace, lasting less than 80 ms within the recorded 20 kHz bandwidth joins at a given Starting Furcation Frequency. In a 7 month long time interval three series of strong STWs were found in a geographically confined search zone. Further, 10 weak STW periods have been identified by a thorough review of a 2 month long recording. Several STWs were found by the investigation of randomly selected DEMETER burst VLF recording acquired globally. On the basis of comparisons with previous studies, we can exclude that this phenomenon is generated by plasma processes in the vicinity of the satellite though the formation mechanism of this (ionospheric) signal is so far unclear. It is possible that this event type appeared in earlier records too, however, without identification.

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“…In the last years, however, with the exclusion of the motion of the medium traversed by the propagating signals, it was possible to derive precise full‐wave solutions of monochromatic and UWB signals from the Maxwell's equations [ Ferencz et al , 1996, 2001; Ferencz , 2005] with a lot of successful applications of these theoretical results mainly in space research [e.g., Ferencz et al , 2001, 2007; Lichtenberger , 2009; Ferencz et al , 2009]. The key step to derive these new solutions was the correct application of the method of inhomogeneous basic modes (MIBM) (see details given by Ferencz [1978c], Ferencz et al [2001], Ferencz [2004], and Ferencz [2005]). A short summary of the MIBM is given in the Appendices A and B.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic wave propagation in inhomogeneous, moving media: A general solution of the problem

Ferencz

2011

Radio Science

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[1] The exact computation, the exact modeling of the propagation of electromagnetic signals through inhomogeneous moving media, is an old theoretical and measuring/data interpretation problem, because in a lot of practical problems, such as the accurate space-time determination in satellite positioning systems, the occultation measurements, or the accurate tracking of the interplanetary probes, the electromagnetic wave (signal) traverses moving, inhomogeneous media, where the moving velocity of the media and the media itself are inhomogeneous in space, i.e., the Earth's high and low atmosphere, the planetary atmospheres, the interplanetary matter in the inner and outer solar system, etc. In other important cases of electromagnetic wave propagation, as the propagation in inhomogeneous media or the propagation of short impulses (ultrawide-band (UWB) signals), the application of the method of inhomogeneous basic modes (MIBM) was successful. In this paper it is demonstrated that the application of MIBM in the case of inhomogeneous moving media produces an exact, full-wave solution of monochromatic or UWB signals propagating through these media. The solutions are valid inside the special relativity.

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Full-wave solution of short impulses in inhomogeneous plasma

Cited by 4 publications

References 3 publications

The effect of subionospheric propagation on whistlers recorded by the DEMETER satellite – observation and modelling

The effect of subionospheric propagation on whistlers recorded by the DEMETER satellite – observation and modelling

An unusual VLF signature structure recorded by the DEMETER satellite

Electromagnetic wave propagation in inhomogeneous, moving media: A general solution of the problem

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