scholarly journals Probability of relativistic electron trapping by parallel and oblique whistler-mode waves in Earth's radiation belts

2015 ◽  
Vol 22 (11) ◽  
pp. 112903 ◽  
Author(s):  
A. V. Artemyev ◽  
A. A. Vasiliev ◽  
D. Mourenas ◽  
A. I. Neishtadt ◽  
O. V. Agapitov ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Radiation Belts ◽  
Electron Trapping ◽  
Whistler Mode ◽  
Whistler Mode Waves ◽  
Earth's Radiation Belts

Discovery of very large amplitude whistler-mode waves in Earth's radiation belts

2008 ◽  
Vol 35 (1) ◽  
Author(s):  
C. Cattell ◽  
J. R. Wygant ◽  
K. Goetz ◽  
K. Kersten ◽  
P. J. Kellogg ◽  
...  
Keyword(s):  
Large Amplitude ◽  
Radiation Belts ◽  
Whistler Mode ◽  
Whistler Mode Waves ◽  
Earth's Radiation Belts

scholarly journals Co-Existance of Lightning Generated Whistlers, Hiss and Lower Hybrid Noise Observed by e- POP (SWARM-E) –RRI

2020 ◽  
Author(s):  
Ashanthi Maxworth ◽  
Mark Gołkowski ◽  
Glenn Hussey
Keyword(s):  
Geomagnetic Field ◽  
Radiation Belts ◽  
Radio Receiver ◽  
Lower Hybrid ◽  
Wave Power ◽  
Dipole Antennas ◽  
Whistler Mode ◽  
Hybrid Resonance ◽  
Whistler Mode Waves ◽  
Lower Hybrid Resonance

Whistler mode waves play a major role in regulating the lifetime of trapped electrons in the Earth's radiation belts. Specifically, whistler mode hiss waves are one of the mechanisms that maintains the slot region between the inner and outer radiation belts. The generation mechanism of hiss is a topic still under debate with at least three prominent theories present in the literature. Lightning generated whistlers in their ducted or non-ducted modes, are considered to be one of the possible sources of hiss. We present a study of new observations from the Radio Receiver Instrument (RRI) on the Enhanced Polar Outflow Probe (ePOP: currently known as SWARM-E). RRI consists of two orthogonal dipole antennas, which enables polarization measurements, when the satellite boresight is parallel to the geomagnetic field. Here we present 75 passes of ePOP - RRI from 2014 - 2018, in which lightning whistlers and hiss waves were observed. In more than 50% of those passes hiss is found to co-exist with the lightning whistlers. Moreover, the whistler observations are correlated with observations of wave power at the lower-hybrid resonance. The observations and a whistler mode ray-tracing study suggest that multiple-hop lightning induced whistlers can be a source of hiss and plasma instabilities in the magnetosphere.

scholarly journals Long-term evolution of electron distribution function due to nonlinear resonant interaction with whistler mode waves

2018 ◽  
Vol 84 (2) ◽  
Author(s):  
Anton V. Artemyev ◽  
Anatoly I. Neishtadt ◽  
Alexei A. Vasiliev ◽  
Didier Mourenas
Keyword(s):  
Kinetic Equation ◽  
Electron Distribution ◽  
Resonant Interaction ◽  
Long Term Evolution ◽  
Radiation Belts ◽  
Linear Diffusion ◽  
Whistler Mode ◽  
Term Evolution ◽  
Whistler Mode Waves

Accurately modelling and forecasting of the dynamics of the Earth’s radiation belts with the available computer resources represents an important challenge that still requires significant advances in the theoretical plasma physics field of wave–particle resonant interaction. Energetic electron acceleration or scattering into the Earth’s atmosphere are essentially controlled by their resonances with electromagnetic whistler mode waves. The quasi-linear diffusion equation describes well this resonant interaction for low intensity waves. During the last decade, however, spacecraft observations in the radiation belts have revealed a large number of whistler mode waves with sufficiently high intensity to interact with electrons in the nonlinear regime. A kinetic equation including such nonlinear wave–particle interactions and describing the long-term evolution of the electron distribution is the focus of the present paper. Using the Hamiltonian theory of resonant phenomena, we describe individual electron resonance with an intense coherent whistler mode wave. The derived characteristics of such a resonance are incorporated into a generalized kinetic equation which includes non-local transport in energy space. This transport is produced by resonant electron trapping and nonlinear acceleration. We describe the methods allowing the construction of nonlinear resonant terms in the kinetic equation and discuss possible applications of this equation.

Conjugate studies of whistler-mode waves in the Van Allen radiation belts

2011 ◽  
Author(s):  
O. Santolik ◽  
J. S. Pickett ◽  
M. Parrot ◽  
D. A. Gurnett ◽  
N. Cornilleau-Wehrlin
Keyword(s):  
Radiation Belts ◽  
Whistler Mode ◽  
Whistler Mode Waves

scholarly journals Observation of relativistic electron microbursts in conjunction with intense radiation belt whistler-mode waves

2011 ◽  
Vol 38 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
K. Kersten ◽  
C. A. Cattell ◽  
A. Breneman ◽  
K. Goetz ◽  
P. J. Kellogg ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Radiation Belt ◽  
Whistler Mode ◽  
Whistler Mode Waves ◽  
Intense Radiation

scholarly journals Quantifying the nonlinear dependence of energetic electron fluxes in the Earth's radiation belts with radial diffusion drivers

2021 ◽  
Author(s):  
Adnane Osmane ◽  
Mikko Savola ◽  
Emilia Kilpua ◽  
Hannu Koskinen ◽  
Joseph E. Borovsky ◽  
...  
Keyword(s):  
Solar Wind ◽  
Mutual Information ◽  
Relativistic Electron ◽  
Pearson Correlation ◽  
Radiation Belts ◽  
Nonlinear Dependence ◽  
Wave Power ◽  
Ulf Wave ◽  
Linear And Nonlinear ◽  
Earth's Radiation Belts

Abstract. In this study, we use mutual information to characterise statistical dependencies of seed and relativistic electron fluxes in the Earth's radiation belts on ultra low frequency (ULF) wave power measured on the ground and at geostationary orbit . The benefit of mutual information, in comparison to measures such as the Pearson correlation, lies in the capacity to distinguish nonlinear dependencies from linear ones. After reviewing the property of mutual information and its relationship with the Pearson correlation for Gaussian bivariates of arbitrary correlation, we present a methodology to quantify and distinguish linear and nonlinear statistical dependencies that can be generalised to a wide range of solar wind drivers and magnetospheric responses. We present an application of the methodology by revisiting the case events studied by Rostoker et al. (1998). Our results corroborate the conclusions of Rostoker et al. (1998) that ULF wave power and relativistic electron fluxes are statistically dependent upon one another. However, we find that observed enhancements in relativistic electron fluxes correlate modestly, both linearly and nonlinearly, with the ULF power spectrum when compared with values found in previous studies (Simms et al., 2014), and with values found between seed electrons and ULF wave power for the same case events. Our results are indicative of the importance in incorporating data analysis tools that can quantify and distinguish between linear and nonlinear interdependencies of various solar wind drivers.

scholarly journals Coexistence of Lightning Generated Whistlers, Hiss and Lower Hybrid Noise Observed by e-POP (SWARM-E)–RRI

Atmosphere ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 177
Author(s):  
Ashanthi Maxworth ◽  
Glenn Hussey ◽  
Mark Gołkowski
Keyword(s):  
Geomagnetic Field ◽  
Radiation Belts ◽  
Radio Receiver ◽  
Lower Hybrid ◽  
Wave Power ◽  
Dipole Antennas ◽  
Whistler Mode ◽  
Hybrid Resonance ◽  
Whistler Mode Waves ◽  
Lower Hybrid Resonance

Whistler mode waves play a major role in regulating the lifetime of trapped electrons in the Earth’s radiation belts. Specifically, interaction with whistler mode hiss waves is one of the mechanisms that maintains the slot region between the inner and outer radiation belts. The generation mechanism of hiss is a topic still under debate with at least three prominent theories present in the literature. Lightning generated whistlers in their ducted or non-ducted modes are considered to be one of the possible sources of hiss. We present a study of new observations from the Radio Receiver Instrument (RRI) on the Enhanced Polar Outflow Probe (ePOP: also known as SWARM-E). RRI consists of two orthogonal dipole antennas, which enables polarization measurements, when the satellite boresight is parallel to the geomagnetic field. Here we present 105 ePOP - RRI events from 2014–2018, in which lightning whistlers(75) and hiss waves(39) were observed. In more than 50% of those whistler observations, hiss found to co-exist. Moreover, the whistler observations are correlated with observations of wave power at the lower-hybrid resonance. The observations and a whistler mode ray-tracing study suggest that multiple-hop lightning induced whistlers can be a source of hiss and plasma instabilities in the magnetosphere.

Stormtime Dynamics of the Relativistic Electron Flux in Earth’s Radiation Belts

2011 ◽  
Author(s):  
D. Vassiliadis ◽  
Dimitris Vassiliadis ◽  
Shing F. Fung ◽  
Xi Shao ◽  
Ioannis A. Daglis ◽  
...  
Keyword(s):  
Relativistic Electron ◽  
Electron Flux ◽  
Radiation Belts ◽  
Earth's Radiation Belts
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