Two‐Dimensional gcPIC Simulation of Rising‐Tone Chorus Waves in a Dipole Magnetic Field

Lu, Quanming; Ke, Yangguang; Wang, Xueyi; Liu, Kaijun; Gao, Xinliang; Chen, Lunjin; Wang, Shui

doi:10.1029/2019ja026586

Cited by 55 publications

(93 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To identify the transverse scale, analyses that use the data in the events with smaller spacecraft separation will be needed in the future. Comparison between the observations and recently developed two‐dimensional simulations of whistler mode waves (Ke et al, 2017; Kuzichev et al, 2019; Lu et al, 2019) or three‐dimensional simulations in the future should also be needed for detailed understanding of the physical mechanism that controls the transverse scale of the whistler mode waves.…”

Section: Discussionmentioning

confidence: 97%

“…In the cases in the magnetosphere, the minimum‐ B along B corresponds to the magnetic equator. Simulation studies (e.g., Hikishima et al, 2009; Katoh & Omura, 2007, 2011, 2013; Ke et al, 2017; Kuzichev et al, 2019; Lu et al, 2019) and observations of Poynting flux direction by various spacecraft around the magnetic equator (e.g., Agapitov et al, 2013; Le Contel et al, 2009; LeDocq et al, 1998; Li et al, 2013; Nagano et al, 1996; Parrot et al, 2003; Santolík et al, 2003; Santolík et al, 2005; Taubenschuss et al, 2016; Teng et al, 2018) indicate that wave generation occurs around the magnetic equator and the waves are radiated away from the equator in the parallel and antiparallel directions with respect to B . Thus, reversals of the field‐aligned component of Poynting fluxes are regarded as the sign of the passage of a wave source region.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Observations of the Source Region of Whistler Mode Waves in Magnetosheath Mirror Structures

et al. 2020

View full text Add to dashboard Cite

In the magnetosheath, intense whistler mode waves, called "Lion roars," are often detected in troughs of magnetic field intensity in mirror mode structures. Using data obtained by the four Magnetospheric Multiscale (MMS) spacecraft, we show that reversals of gradient of magnetic field intensity along the magnetic field correspond to reversals of the field-aligned component of Poynting flux of whistler mode waves in the troughs. Such a characteristic is consistent with the idea that the whistler mode waves are effectively generated near the local minima of magnetic field intensity because of the smallest cyclotron resonance velocity and propagate toward regions of larger magnetic field intensity along the magnetic field lines on both sides. We use the reversal of the Poynting flux as an indicator of wave source regions. In these regions, we find that pancake or an outer edge of butterfly electron distributions above~100 eV are good candidates for wave generation. Unclear correlations of phase difference and amplitude variations of whistler mode waves in cases of~40 km spacecraft separation indicate that a simple plane wave approximation with a constant amplitude is not valid at this spatial scale that is much smaller than the ion gyroradius. The whistler mode waves consist of small coherent wave packets from multiple sources with spatial scales smaller than tens of electron gyroradii transverse to the background magnetic field in a mirror mode structure.

show abstract

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Observations of the Source Region of Whistler Mode Waves in Magnetosheath Mirror Structures

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Chorus waves are commonly believed to be excited by anisotropic hot electrons at the magnetic equator, whose wave normal angles are typically very small Ke et al, 2017;Lu et al, 2019;Omura et al, 2008). Then, they will propagate toward high-latitude regions with increasing wave normal angles Ke et al, 2017;Lu et al, 2019). Meanwhile, the parallel electric field of chorus waves also becomes significant, which will accelerate electrons in the parallel direction through the The scatter plots of chorus events in the (E ∥ /B 0 V Ae , n h /n 0 ) plane with color-coded n b /n h for two categories (i.e., θ < 45°and θ > 45°) and (c and d) the median value of n b /n h in the (E ∥ /B 0 V Ae , n h /n 0 ) plane.…”

Section: Summary and Discussionmentioning

confidence: 99%

Unraveling the Correlation Between Chorus Wave and Electron Beam‐Like Distribution in the Earth's Magnetosphere

Chen

Gao

et al. 2019

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

In this letter, we have investigated the correlation between lower band chorus waves and electron beam‐like distribution with long‐term THEMIS data. Cold, hot, and beam electrons are assumed in the plasma. For quasi‐parallel chorus waves, they are usually observed along with a relatively weak electron beam. Moreover, the density ratio between beam and hot electrons nb/nh is positively correlated with the wave parallel electric field and inversely correlated with the hot electron density, in agreement with a formation of the beam by Landau acceleration during wave propagation, while, along with oblique waves, there typically exists a strong electron beam. Notably, the nb/nh is found to be independent of both the parallel electric field and hot electron density, indicating that the electron beam‐like distribution should be a precondition for exciting oblique waves rather than caused by waves. Our study provides some new insights into understanding the generation and evolution of chorus waves.

show abstract

“…Particle‐in‐cell (PIC) codes (Dawson, ) and hybrid codes, which include the feedback from plasma to fields (e.g., Camporeale, ; Delzanno et al, ; Meierbachtol et al, ), allow the self‐consistent generation of the wave spectrum and no further assumption is required. PIC codes are used to investigate the self‐consistent mechanism of wave generation and growth in the radiation belts, such as chorus generation and enhancement (Fu et al, , ; Lu et al, ), whistler instability effects (Fan et al, ; Yoon et al, ) and saturation (Wu et al, ), and magnetosonic wave excitation (Chen et al, ) and propagation (Min et al, ). PIC codes are also used to test the validity of the quasilinear theory (e.g., Camporeale, ; Tao et al, ) and for computing spacecraft charging in the radiation belts (Delzanno et al, ; Lucco Castello et al, ).…”

Section: New Radiation Belt Modeling Capabilities and The Quantificatmentioning

confidence: 99%

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

et al. 2020

View full text Add to dashboard Cite

The past decade transformed our observational understanding of energetic particle processes in near‐Earth space. An unprecedented suite of observational systems was in operation including the Van Allen Probes, Arase, Magnetospheric Multiscale, Time History of Events and Macroscale Interactions during Substorms, Cluster, GPS, GOES, and Los Alamos National Laboratory‐GEO magnetospheric missions. They were supported by conjugate low‐altitude measurements on spacecraft, balloons, and ground‐based arrays. Together, these significantly improved our ability to determine and quantify the mechanisms that control the buildup and subsequent variability of energetic particle intensities in the inner magnetosphere. The high‐quality data from National Aeronautics and Space Administration's Van Allen Probes are the most comprehensive in situ measurements ever taken in the near‐Earth space radiation environment. These observations, coupled with recent advances in radiation belt theory and modeling, including dramatic increases in computational power, have ushered in a new era, perhaps a “golden era,” in radiation belt research. We have edited a Journal of Geophysical Research: Space Science Special Collection dedicated to Particle Dynamics in the Earth's Radiation Belts in which we gather the most recent scientific findings and understanding of this important region of geospace. This collection includes the results presented at the American Geophysical Union Chapman International Conference in Cascais, Portugal (March 2018) and many other recent and relevant contributions. The present article introduces and review the context, current research, and main questions that motivate modern radiation belt research divided into the following topics: (1) particle acceleration and transport, (2) particle loss, (3) the role of nonlinear processes, (4) new radiation belt modeling capabilities and the quantification of model uncertainties, and (5) laboratory plasma experiments.

show abstract

Two‐Dimensional gcPIC Simulation of Rising‐Tone Chorus Waves in a Dipole Magnetic Field

Cited by 55 publications

References 63 publications

Observations of the Source Region of Whistler Mode Waves in Magnetosheath Mirror Structures

Observations of the Source Region of Whistler Mode Waves in Magnetosheath Mirror Structures

Unraveling the Correlation Between Chorus Wave and Electron Beam‐Like Distribution in the Earth's Magnetosphere

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

Contact Info

Product

Resources

About