A first approach to model the low-frequency wave activity in the plasmasphere

Abstract. A comprehensive empirical model of waves is developed in the objective to simulate wave-particle interactions involved in the loss and acceleration of radiation belt electrons. Three years of measured magnetic wave field components from the Plasma Wave Instrument on board the DE-1 satellite are used to model the amplitude spectral density of the magnetic wave field of each type of emission observed in the equatorial regions of the plasmasphere: VLF transmitter emissions, chorus emissions, plasmaspheric hiss emissions and equatorial emissions below ~ 200 Hz. Each model is a function of the wave frequency f , the MLT, L and Mlat parameters, and the Kp values. The performances of the plasmaspheric hiss and chorus models are tested on amplitude spectra recorded on board the OGO-5 and GEOS-1 satellites.Key words. Magnetospheric physics (plasmasphere; plasma waves and instabilities; instruments and techniques)

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Plasma Waves in the Inner Magnetosphere

10.1007/978-3-030-82167-8_4 ◽

2021 ◽

pp. 85-119

Author(s):

Hannu E. J. Koskinen ◽

Emilia K. J. Kilpua

Keyword(s):

Radiation Belt ◽

Low Frequency ◽

Plasma Waves ◽

Mhd Waves ◽

Particle Interactions ◽

Inner Magnetosphere ◽

Very Low Frequency ◽

Link Type ◽

Wave Modes

AbstractUnderstanding the role of plasma waves, extending from magnetohydrodynamic (MHD) waves at ultra-low-frequency (ULF) oscillations in the millihertz range to very-low-frequency (VLF) whistler-mode emissions at frequencies of a few kHz, is necessary in studies of sources and losses of radiation belt particles. In order to make this theoretically heavy part of the book accessible to a reader, who is not familiar with wave–particle interactions, we have divided the treatise into three chapters. In the present chapter we introduce the most important wave modes that are critical to the dynamics of radiation belts. The drivers of these waves are discussed in Chap. 10.1007/978-3-030-82167-8_5 and the roles of the wave modes as sources and losses of radiation belt particles are dealt with in Chap. 10.1007/978-3-030-82167-8_6.

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Global models of the inner electron radiation belt and slot region investigating the effects of VLF transmitter waves

10.5194/egusphere-egu2020-4642 ◽

2020 ◽

Author(s):

Johnathan Ross ◽

Sarah Glauert ◽

Richard Horne ◽

Nigel Meredith ◽

Mark Clilverd

Keyword(s):

Radiation Belt ◽

Low Frequency ◽

Particle Interactions ◽

Electron Dynamics ◽

Global Models ◽

Inner Magnetosphere ◽

The Earth ◽

Radiation Belt Electrons ◽

Wave Particle Interactions ◽

Earth Orbits

Signals from man-made very low frequency (VLF) transmitters can leak from the Earth-ionosphere wave guide into the inner magnetosphere, where they propagate in the whistler mode and contribute to electron dynamics in the inner radiation belt and slot region through wave-particle interactions. These inner regions of the magnetosphere are becoming increasingly important from a satellite perspective. For instance, the newly populated Medium Earth Orbits pass though the slot region, and satellites launched via electric orbit raising are exposed to the inner belt and slot region for extended periods of time.We have calculated diffusion coefficients associated with wave-particle interactions between radiation belt electrons and waves from each of the strongest VLF transmitters using Van Allen Probe observations. These coefficients are included into global models of the radiation belts to assess the importance of the effects of VLF transmitters individually and collectively on electron populations.

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Ultra‐Low‐Frequency Wave–Particle Interactions in Earth's Outer Radiation Belt

Dayside Magnetosphere Interactions - Geophysical Monograph Series ◽

10.1002/9781119509592.ch11 ◽

2020 ◽

pp. 189-205

Author(s):

R. Rankin ◽

C. R. Wang ◽

Y. F. Wang ◽

Qiugang Zong ◽

X. Z. Zhou ◽

...

Keyword(s):

Radiation Belt ◽

Low Frequency ◽

Particle Interactions ◽

Outer Radiation Belt ◽

Frequency Wave ◽

Wave Particle Interactions

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A Comparison of Radial Diffusion Coefficients in 1-D and 3-D Long-Term Radiation Belt Simulations

10.5194/egusphere-egu2020-17757 ◽

2020 ◽

Author(s):

Alexander Drozdov ◽

Hayley Allison ◽

Yuri Shprits ◽

Nikita Aseev

Keyword(s):

Radiation Belt ◽

Low Frequency ◽

Radial Diffusion ◽

Ulf Waves ◽

Electron Radiation ◽

Particle Interactions ◽

Physical Mechanisms ◽

Modeling And Forecasting ◽

Radiation Belt Electrons

Radial diffusion is one of the dominant physical mechanisms that drives acceleration andloss of the radiation belt electrons due to wave-particle interactions with ultra-low frequency (ULF) waves, which makes it very important for radiation belt modeling and forecasting.&#160; We investigate the sensitivity of several parameterizations of the radial diffusion including Brautigam and Albert (2000), Ozeke et al. (2014), Ali et al. (2016), and Liu et al. (2016) on long-term radiation belt modeling using the Versatile Electron Radiation Belt (VERB) code.&#160; Following previous studies, we first perform 1-D radial diffusion simulations.&#160; To take into account effects of local acceleration and loss, we perform additional 3-D simulations, including pitch-angle, energy and mixed diffusion.

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