Numerical simulation of the penetration and reflection of a whistler beam incident on the lower ionosphere at very low latitude

Wu, Xiaofang; Nagano, I.; Zhang, Bao; Shimbo, Tatsuya

doi:10.1016/0021-9169(95)00060-7

Cited by 9 publications

(3 citation statements)

References 21 publications

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“…Along the field line, there were drastic density fluctuations on a scale of 10 km, comparable to or less than the whistler wavelengths (Figure 2b). According to previous simulations (e.g., Wu et al., 1996), the incident whistler waves would undergo significant reflection and refraction at these density interfaces. The field‐aligned density fluctuations could have largely suppressed the long‐distance propagation of waves from other sources to the observer.…”

Section: Linear Growth Of Whistler‐mode Wavesmentioning

confidence: 78%

Inferring Whistler‐Mode Chorus Wave Source Regions in the Martian Mini‐Magnetospheres

Cheng,

Su,

et al. 2024

Geophysical Research Letters

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Martian mini‐magnetospheres contain whistler‐mode chorus waves potentially contributing to atmospheric escape, analogous to the Earth's inner magnetosphere. At Earth, the chorus waves have been found to originate from the near‐equatorial region spanning approximately 2% of the entire magnetic field line length. However, because of the lack of wave Poynting flux measurements, the Martian chorus source region remains unclear. By comparing the frequency dependence between observed wave power and modeled linear growth rates, we present the first attempt to explore the chorus wave source distribution along the Martian mini‐magnetospheric field lines. Our data‐to‐model comparisons support that these waves are not generated by a single source tightly confined near the magnetic strength minimal location but by intermittent or continuous sources spanning up to 40% of the entire field line length. These results imply that the Martian mini‐magnetospheres could have more active energy transfer processes mediated by whistler‐mode chorus waves than the expectation.

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Section: Linear Growth Of Whistler‐mode Wavesmentioning

confidence: 78%

Inferring Whistler‐Mode Chorus Wave Source Regions in the Martian Mini‐Magnetospheres

Cheng,

Su,

et al. 2024

Geophysical Research Letters

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“…We reiterate that the matrix method of Isamu Nagano and colleagues [ Nagano et al , 1975, 2003; Xiang‐Yang et al , 1996] solves the spherical‐wave problem exactly, using a stack of ionospheric layers within each of which the plasma density and collision rate are held constant. In contrast, our work retains the Pitteway approach of a differential equation solution and then, to represent wavefront curvature, uses a more approximate, and computationally less burdensome, approach than that of Nagano.…”

Section: Geometrical Approachmentioning

confidence: 99%

“…A careful and extremely exact approach to calculating ionospheric reflection has been incrementally developed over a few decades by Isamu Nagano and his colleagues [ Nagano et al , 1975, 2003; Xiang‐Yang et al , 1996]. They divide the D region into a stack of thin layers, within which the ionospheric parameters are constant, and invoke the Fresnel reflection conditions at each interface between adjacent layers.…”

Section: Introductionmentioning

confidence: 99%

Full‐wave reflection of lightning long‐wave radio pulses from the ionospheric D region: Numerical model

2009

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[1] A model is developed for calculating ionospheric reflection of electromagnetic pulses emitted by lightning, with most energy in the long-wave spectral region (f $ 3-100 kHz). The building block of the calculation is a differential equation full-wave solution of Maxwell's equations for the complex reflection of individual plane waves incident from below, by the anisotropic, dissipative, diffuse dielectric profile of the lower ionosphere. This full-wave solution is then put into a summation over plane waves in an angular direct Fourier transform to obtain the reflection properties of curved wavefronts. This step models also the diffraction effects of long-wave ionospheric reflections observed at short or medium range ($200-500 km). The calculation can be done with any arbitrary but smooth dielectric profile versus altitude. For an initial test, this article uses the classic D region exponential profiles of electron density and collision rate given by Volland. With even these simple profiles, our model of full-wave reflection of curved wavefronts captures some of the basic attributes of observed reflected waveforms recorded with the Los Alamos Sferic Array. A follow-on article will present a detailed comparison with data in order to retrieve ionospheric parameters.

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Analysis of a bipolar upward lightning flash based on simultaneous records of currents and 380-km distant electric fields

Mostajabi

Azadifar

et al. 2019

Electric Power Systems Research

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Numerical simulation of the penetration and reflection of a whistler beam incident on the lower ionosphere at very low latitude

Cited by 9 publications

References 21 publications

Inferring Whistler‐Mode Chorus Wave Source Regions in the Martian Mini‐Magnetospheres

Inferring Whistler‐Mode Chorus Wave Source Regions in the Martian Mini‐Magnetospheres

Full‐wave reflection of lightning long‐wave radio pulses from the ionospheric D region: Numerical model

Analysis of a bipolar upward lightning flash based on simultaneous records of currents and 380-km distant electric fields

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