Simulation of nonducted whistler spectrograms observed aboard the MAGION 4 and 5 satellites

Shklyar, D. R.; Jiřı́ček, F.

doi:10.1016/s1364-6826(99)00097-8

Cited by 41 publications

(54 citation statements)

References 13 publications

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“…Some features of quasi-longitudinal and quasiresonance wave propagation, useful for understanding the results of numerical simulations based on the dispersion relation Eq. (3), were discussed by Shklyar and Jiȓícek (2000). The expressions for the longitudinal (parallel to the ambient magnetic field) and transverse (perpendicular to the ambient magnetic field) components of the group velocity that follow from Eq.…”

Section: Dispersion Relation and Group Velocitymentioning

confidence: 99%

“…Here we discuss how it is done by means of ray-tracing calculations based on the equations of geometrical optics. Since very many rays must be calculated in order to reproduce the main features of Nuwhistlers on a model spectrogram, we use relatively simple models for the geomagnetic field and for the distributions of plasma density and LHR frequency, all given by analytical expressions (see Shklyar and Jiȓícek (2000) for details).…”

Section: Spectrogram Modelling By Means Of Ray Tracingmentioning

confidence: 99%

“…(29). The corresponding data base, which is similar to the one described by Shklyar and Jiȓícek (2000) but supplemented with the relative-intensity parameters, has been computerized. Spectrograms calculated with the help of this data base are presented in the next section.…”

Section: Calculation Of Spectral Intensitymentioning

confidence: 99%

“…We note that MAGION 4, and also MAGION 5 on the descending parts of its orbits, observed MR whistlers in the equatorial region at altitudes from about 1.3 to 2 Earth radii, which is far from the regions where the waves are reflected. Such MR whistlers have been discussed in detail by Shklyar and Jiȓícek (2000); one example is presented in Fig. 6, with its simulated counterpart shown in Fig.…”

Section: Nu Whistlers From the Magion 5 Satellite And Their Modellingmentioning

confidence: 99%

“…Some comments on these studies may be found in the paper by Shklyar and Jiȓícek (2000), where an analysis of MR whistlers observed by MAGION 4 and 5 was supplemented by an extensive numerical simulation of MR-whistler spectrograms. Since then, several authors have used numerical simulation of spectrograms in their studies of MR whistlers.…”

Section: Introductionmentioning

confidence: 99%

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Characteristic properties of Nu whistlers as inferred from observations and numerical modelling

2004

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Abstract. The properties of Nu whistlers are discussed in the light of observations by the MAGION 5 satellite, and of numerically simulated spectrograms of lightning-induced VLF emissions. The method of simulation is described in full. With the information from this numerical modelling, we distinguish the characteristics of the spectrograms that depend on the site of the lightning strokes from those that are determined mainly by the position of the satellite. Also, we identify the region in the magnetosphere where Nu whistlers are observed most often, and the geomagnetic conditions favouring their appearance. The relation between magnetospherically reflected (MR) whistlers and Nu whistlers is demonstrated by the gradual transformation of MR whistlers into Nu whistlers as the satellite moves from the high-altitude equatorial region to lower altitudes and higher latitudes. The magnetospheric reflection of nonducted whistler-mode waves, which is of decisive importance in the formation of Nu whistlers, is discussed in detail.

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Section: Dispersion Relation and Group Velocitymentioning

confidence: 99%

Section: Spectrogram Modelling By Means Of Ray Tracingmentioning

confidence: 99%

Section: Calculation Of Spectral Intensitymentioning

confidence: 99%

Section: Nu Whistlers From the Magion 5 Satellite And Their Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristic properties of Nu whistlers as inferred from observations and numerical modelling

2004

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Identification of the source of quasiperiodic VLF emissions using ground‐based and Van Allen Probes satellite observations

Титова

Kozelov

Демехов

et al. 2015

Geophysical Research Letters

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We report on simultaneous spacecraft and ground‐based observations of quasiperiodic VLF emissions and related energetic‐electron dynamics. Quasiperiodic emissions in the frequency range 2–6 kHz were observed during a substorm on 25 January 2013 by Van Allen Probe‐A and a ground‐based station in the Northern Finland. The spacecraft detected the VLF signals near the geomagnetic equator in the night sector at L = 3.0–4.2 when it was inside the plasmasphere. During the satellite motion toward higher latitudes, the time interval between quasiperiodic elements decreased from 6 min to 3 min. We find one‐to‐one correspondence between the quasiperiodic elements detected by Van Allen Probe‐A and on the ground, which indicates the temporal nature of the observed variation in the time interval between quasiperiodic elements. Multiсomponent measurements of the wave electric and magnetic fields by the Van Allen Probe‐A show that the quasiperiodic emissions were almost circularly right‐hand polarized whistler mode waves and had predominantly small (below 30°) wave vector angles with respect to the magnetic field. In the probable source region of these signals (L about 4), we observed synchronous variations of electron distribution function at energies of 10–20 keV and the quasiperiodic elements. In the pause between the quasiperiodic elements pitch angle distribution of these electrons had a maximum near 90°, while they become more isotropic during the development of quasiperiodic elements. The parallel energies of the electrons for which the data suggest direct evidence of the wave‐particle interactions is in a reasonable agreement with the estimated cyclotron resonance energy for the observed waves.

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Experimental determination of the dispersion relation of magnetosonic waves

et al. 2015

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Magnetosonic waves are commonly observed in the vicinity of the terrestrial magnetic equator. It has been proposed that within this region they may interact with radiation belt electrons, accelerating some to high energies. These wave‐particle interactions depend upon the characteristic properties of the wave mode. Hence, determination of the wave properties is a fundamental part of understanding these interaction processes. Using data collected during the Cluster Inner Magnetosphere Campaign, this paper identifies an occurrence of magnetosonic waves, discusses their generation and propagation properties from a theoretical perspective, and utilizes multispacecraft measurements to experimentally determine their dispersion relation. Their experimental dispersion is found to be in accordance with that based on cold plasma theory.

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Simulation of nonducted whistler spectrograms observed aboard the MAGION 4 and 5 satellites

Cited by 41 publications

References 13 publications

Characteristic properties of Nu whistlers as inferred from observations and numerical modelling

Characteristic properties of Nu whistlers as inferred from observations and numerical modelling

Identification of the source of quasiperiodic VLF emissions using ground‐based and Van Allen Probes satellite observations

Experimental determination of the dispersion relation of magnetosonic waves

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