Results 31 to 40 of about 162 (141)

Variation in Plasmaspheric Hiss Wave Power With Plasma Density

Geophysical Research Letters, 2018
AbstractPlasmaspheric hiss waves are commonly observed in the inner magnetosphere. These waves efficiently scatter electrons, facilitating their precipitation into the atmosphere. Predictive inner magnetosphere simulations often model hiss waves using parameterized empirical maps of observed hiss power. These maps nearly always include parameterization
David M. Malaspina, Jean‐Francois Ripoll, Xiangning Chu, George Hospodarsky, John Wygant   +4 more
openaire   +1 more source

Modeling the properties of plasmaspheric hiss: 1. Dependence on chorus wave emission [PDF]

Journal of Geophysical Research: Space Physics, 2012
There is increasing evidence that plasmaspheric hiss is formed by the evolution of a portion of chorus waves that are excited in the plasmatrough and propagate into the plasmasphere. Comparison between the statistical spatial distributions of these two emissions in the morning sector during active times from THEMIS over ∼3 years shows that the two ...
Chen, Lunjin, Bortnik, Joacob, Li, Wen, Thorne, Richard M., Horne, Richard B.   +4 more
openaire   +2 more sources

Realistic Dispersion of Plasmaspheric Hiss in the Inner Magnetosphere and Its Effect on Wave-induced Electron Scattering Rates [PDF]

The Astrophysical Journal, 2021
Abstract The cold plasma approximation is a common treatment to study wave–particle interactions between plasmaspheric hiss and magnetospheric electrons, which, however, can become a challenge during periods of disturbed geomagnetic activity.
Xin Ma, Xing Cao, Binbin Ni, Qi Zhu, Zheng Xiang   +4 more
openaire   +1 more source

Temporal variability of quasi-linear pitch-angle diffusion

Frontiers in Astronomy and Space Sciences, 2022
Kinetic wave-particle interactions in Earth’s outer radiation belt energize and scatter high-energy electrons, playing an important role in the dynamic variation of the extent and intensity of the outer belt.
Clare E. J. Watt, Hayley J. Allison, Sarah N. Bentley, Rhys L. Thompson, I. Jonathan Rae, Oliver Allanson, Nigel P. Meredith, Johnathan P. J. Ross, Sarah A. Glauert, Richard B. Horne, Shuai Zhang, Kyle R. Murphy, Kyle R. Murphy, Dovilė Rasinskaitė, Shannon Killey   +14 more
doaj   +1 more source

Simulation study on parametric dependence of whistler-mode hiss generation in the plasmasphere

Earth, Planets and Space, 2021
We conduct electromagnetic particle simulations to examine the applicability of nonlinear wave growth theory to the generation process of plasmaspheric hiss. We firstly vary the gradient of the background magnetic field from a realistic model to a rather
Yin Liu, Yoshiharu Omura, Mitsuru Hikishima   +2 more
doaj   +1 more source

Enhanced Radiation Levels at Aviation Altitudes and Their Relationship to Plasma Waves in the Inner Magnetosphere

Space Weather, 2023
It is believed that galactic cosmic rays and solar energetic particles are the two major sources of ionizing radiation. However, the radiation source may also be due to relativistic electrons that are associated with precipitation from the Van Allen ...
Homayon Aryan, Jacob Bortnik, W. Kent Tobiska, Piyush Mehta, Rashmi Siddalingappa   +4 more
doaj   +1 more source

Radial diffusion simulations of the 20 September 2007 radiation belt dropout [PDF]

Annales Geophysicae, 2014
This is a study of a dropout of radiation belt electrons, associated with an isolated solar wind density pulse on 20 September 2007, as seen by the solid-state telescopes (SST) detectors on THEMIS (Time History of Events and Macroscale Interactions ...
J. Albert
doaj   +1 more source

The distribution of plasmaspheric hiss wave power with respect to plasmapause location

Geophysical Research Letters, 2016
AbstractIn this work, Van Allen Probes data are used to derive terrestrial plasmaspheric hiss wave power distributions organized by (1) distance away from the plasmapause and (2) plasmapause distance from Earth. This approach is in contrast to the traditional organization of hiss wave power by L parameter and geomagnetic activity.
David M. Malaspina, Allison N. Jaynes, Cory Boulé, Jacob Bortnik, Scott A. Thaller, Robert E. Ergun, Craig A. Kletzing, John R. Wygant   +7 more
openaire   +2 more sources

Observational evidence of the nonlinear wave growth theory of plasmaspheric hiss

Geophysical Research Letters, 2016
AbstractWe test the recently developed nonlinear wave growth theory of plasmaspheric hiss against discrete rising tone elements of hiss emissions observed by the Van Allen Probes. From the phase variation of the waveforms processed by bandpass filters, we calculate the instantaneous frequencies and wave amplitudes.
Satoko Nakamura, Yoshiharu Omura, Danny Summers, Craig A. Kletzing   +3 more
openaire   +1 more source

Distinct Formation and Evolution Characteristics of Outer Radiation Belt Electron Butterfly Pitch Angle Distributions Observed by Van Allen Probes

Geophysical Research Letters, 2020
Using Van Allen Probes pitch angle‐resolved electron flux data, we report intriguing events of electron butterfly pitch angle distributions (PADs) at L > ~5.5 on the nightside with distinct durations, i.e., about 9 hr for the 28–29 April 2013 event and ...
Binbin Ni, Ling Yan, Song Fu, Xudong Gu, Xing Cao, Zheng Xiang, Yuannong Zhang   +6 more
doaj   +1 more source