Found 4 entries in the Bibliography.

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Characteristics and Generation of Low-Frequency Magnetosonic Waves Below the Proton Gyrofrequency

We report a Van Allen Probes observation of large-amplitude magnetosonic waves with the peak intensity below the proton gyrofrequency (fcp), which may potentially be misinterpreted as electromagnetic ion cyclotron waves. The frequency spacing of the wave harmonic structure suggests that these magnetosonic waves are excited at a distant source region and propagate radially inward. We also conduct a statistical analysis of low-frequency magnetosonic waves below fcp based on the Van Allen Probes data from October 2012 to Decemb ...

Teng, Shangchun; Li, Wen; Tao, Xin; Ma, Qianli; Shen, Xiaochen;

YEAR: 2019     DOI: 10.1029/2019GL085372

Below the proton gyrofrequency; Low frequency magnetosonic wave; Van Allen Probes; wave generation; Wave propagation characteristics

Typical Characteristics of Whistler Mode Waves Categorized by Their Spectral Properties Using Van Allen Probes Observations

Properties of banded, no-gap, lower band only, and upper band only whistler mode waves (0.1\textendash0.8fce) outside the plasmasphere are investigated using Van Allen Probes data. Our analysis shows that no-gap whistler waves have higher occurrence rate at morning side and dayside, while banded and lower band only waves have higher occurrence rate between midnight and dawn. We also find that the occurrence rate of no-gap whistler waves peaks at magnetic latitude |MLAT|\~8\textendash10\textdegree, while banded waves have hig ...

Teng, S.; Tao, X.; Li, W.;

YEAR: 2019     DOI: 10.1029/2019GL082161

banded whistler waves; chorus waves; no-gap whistler waves; Van Allen Probes


Observation of Oblique Lower Band Chorus Generated by Nonlinear Three-Wave Interaction

Oblique whistler mode waves have been suggested to play an important role in radiation belt electron dynamics. Recently, Fu et al. [2017] proposed that highly oblique lower band whistler waves could be generated by nonlinear three-wave resonance. Here we present the first observational evidence of such process, using Van Allen Probes data, where an oblique lower band chorus wave is generated by two quasi-parallel waves through nonlinear three-wave interaction. The wave resonance condition is satisfied even in the presence of ...

Teng, S.; Zhao, J.; Tao, X.; Wang, S.; Reeves, G.;

YEAR: 2018     DOI: 10.1029/2018GL078765

Oblique lower band chorus; radiation belt physics; Van Allen Probes; wave particle interaction; wave-wave interaction


Analysis of the Duration of Rising Tone Chorus Elements

The duration of chorus elements is an important parameter to understand chorus excitation and to quantify the effects of nonlinear wave-particle interactions on energetic electron dynamics. In this work, we analyze the duration of rising tone chorus elements statistically using Van Allen Probes data. We present the distribution of chorus element duration (τ) as a function of magnetic local time (MLT) and the geomagnetic activity level characterized by auroral electrojet (AE) index. We show that the typical value of τ for n ...

Teng, S.; Tao, X.; Xie, Y.; Zonca, F.; Chen, L.; Fang, W.; Wang, S.;

YEAR: 2017     DOI: 10.1002/2017GL075824

chorus element duration; DAWN; frequency chirping rate; Van Allen Probes