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Van Allen Probes Bibliography is from August 2012 through September 2021
Found 4 entries in the Bibliography.
Showing entries from 1 through 4
Generation of Highly Oblique Lower-band Chorus via Nonlinear Three-wave Resonance
Chorus in the inner magnetosphere has been observed frequently at geomagnetically active times, typically exhibiting a two-band structure with a quasi-parallel lower-band and an upper-band with a broad range of wave normal angles. But recent observations by Van Allen Probes confirm another type of lower-band chorus, which has a large wave normal angle close to the resonance cone angle. It has been proposed that these waves could be generated by a low-energy beam-like electron component or by temperature anisotropy of keV ele ...
Fu, Xiangrong; Gary, Peter; Reeves, Geoffrey; Winske, Dan; Woodroffe, Jesse;
Published by: Geophysical Research Letters Published on: 09/2017
YEAR: 2017   DOI: 10.1002/2017GL074411
oblique whistler; PIC simulation; Ray Tracing; three-wave resonance; Van Allen Probes
Ion Bernstein instability as a possible source for oxygen ion cyclotron harmonic waves
This paper demonstrates that an ion Bernstein instability can be a possible source for recently reported electromagnetic waves with frequencies at or near the singly ionized oxygen ion cyclotron frequency, inline image, and its harmonics. The particle measurements during strong wave activity revealed a relatively high concentration of oxygen ions (\~15\%) whose phase space density exhibits a local peak at energy \~20 keV. Given that the electron plasma-to-cyclotron frequency ratio is inline image, this energy corresponds t ...
Min, Kyungguk; Denton, Richard; Liu, Kaijun; Gary, Peter; Spence, Harlan;
Published by: Journal of Geophysical Research: Space Physics Published on: 05/2017
YEAR: 2017   DOI: 10.1002/2017JA023979
O+ Bernstein instability; O+ harmonic waves; O+ ring distribution; Van Allen Probes
Nonlinear subcyclotron resonance as a formationmechanism for gaps in banded chorus
An interesting characteristic of magnetospheric chorus is the presence of a frequency gap at ω≃0.5Ωe, where Ωe is the electron cyclotron angular frequency. Recent chorus observations sometimes show additional gaps near 0.3Ωe and 0.6Ωe. Here we present a novel nonlinear mechanism for the formation of these gaps using Hamiltonian theory and test particle simulations in a homogeneous, magnetized, collisionless plasma. We find that an oblique whistler wave with frequency at a fraction of the electron cyclotron frequency c ...
Fu, Xiangrong; Guo, Zehua; Dong, Chuanfei; Gary, Peter;
Published by: Geophysical Research Letters Published on: 05/2015
YEAR: 2015   DOI: 10.1002/2015GL064182
Whistler Anisotropy Instabilities as the Source of Banded Chorus: Van Allen Probes Observations and Particle-in-Cell Simulations
Magnetospheric banded chorus is enhanced whistler waves with frequencies ωr < Ωe, where Ωe is the electron cyclotron frequency, and a characteristic spectral gap at ωr ≃ Ωe/2. This paper uses spacecraft observations and two-dimensional particle-in-cell (PIC) simulations in a magnetized, homogeneous, collisionless plasma to test the hypothesis that banded chorus is due to local linear growth of two branches of the whistler anisotropy instability excited by two distinct, anisotropic electron components of significantly ...
Fu, Xiangrong; Cowee, Misa; Friedel, Reinhard; Funsten, Herbert; Gary, Peter; Hospodarsky, George; Kletzing, Craig; Kurth, William; Larsen, Brian; Liu, Kaijun; MacDonald, Elizabeth; Min, Kyungguk; Reeves, Geoffrey; Skoug, Ruth; Winske, Dan;
Published by: Journal of Geophysical Research: Space Physics Published on: 10/2014
YEAR: 2014   DOI: 10.1002/2014JA020364