Search Publications
Statistics of whistler mode waves in the outer radiation belt: Cluster STAFF-SA measurements
Breuillard, Hugo; Khotyaintsev, Yuri V.; Balikhin, Michael +5 more
ELF/VLF waves play a crucial role in the dynamics of the radiation belts and are partly responsible for the main losses and the acceleration of energetic electrons. Modeling wave-particle interactions requires detailed information of wave amplitudes and wave normal distribution over L-shells and over magnetic latitudes for different geomagnetic ac…
Particle acceleration in dipolarization events
Nakamura, R.; Hesse, M.; Birn, J. +1 more
Using the electromagnetic fields of a recent MHD simulation of magnetotail reconnection, flow bursts and dipolarization, we investigate the acceleration of test particles (protons and electrons) to suprathermal energies, confirming and extending earlier results on acceleration mechanisms and sources. (Part of the new results have been reviewed rec…
Kinetic analysis of the energy transport of bursty bulk flows in the plasma sheet
Zhang, Tielong; Ma, Yuduan; Cao, Jinbin +3 more
The energy transport of bursty bulk flows (BBFs) is very important to the understanding of substorm energy transport. Previous studies all use the MHD bulk parameters to calculate the energy flux density of BBFs. In this paper, we use the kinetic approach, i.e., ion velocity distribution function, to study the energy transport of an earthward burs…
Modeling the wave normal distribution of chorus waves
Thorne, Richard M.; Li, Wen; Chen, Lunjin +1 more
The propagation and attenuation characteristics of lower band and upper band chorus waves are investigated by ray tracing, and the evaluation of Landau damping based on an empirical suprathermal electron model derived from Time History of Events and Macroscale Interactions during Substorms (THEMIS) data. The rate of Landau damping is found to incr…
The role of transient ion foreshock phenomena in driving Pc5 ULF wave activity
Plaschke, F.; Angelopoulos, V.; Turner, D. L. +2 more
The ion foreshock is a source of energy for magnetospheric ULF waves, but it is usually only considered effective at driving ULF waves with frequencies above the Pc5 (2-7 mHz) range. We present observations for an 8 h high speed solar wind interval on 14 July 2008 during which three distinct types of transient ion foreshock phenomena (TIFP) were o…
Effect of the background magnetic field inhomogeneity on generation processes of whistler-mode chorus and broadband hiss-like emissions
Katoh, Yuto; Omura, Yoshiharu
By a series of self-consistent electron hybrid code simulations, we study the effect of the background magnetic field inhomogeneity on the generation process of whistler-mode chorus emissions. Chorus with rising tones are generated through nonlinear wave-particle interactions occurring around the magnetic equator. The mirror force plays an importa…
Energization of O+ ions in the Earth's inner magnetosphere and the effects on ring current buildup: A review of previous observations and possible mechanisms
Keika, Kunihiro; Brandt, Pontus C.; Kistler, Lynn M.
In situ observations and modeling work have confirmed that singly charged oxygen ions, O+, which are of Earth's ionospheric origin, are heated/accelerated up to >100 keV in the magnetosphere. The energetic O+ population makes a significant contribution to the plasma pressure in the Earth's inner magnetosphere during magnet…
Relativistic electron microbursts due to nonlinear pitch angle scattering by EMIC triggered emissions
Omura, Yoshiharu; Zhao, Qinghua
We show that the anomalous cyclotron resonance between relativistic electrons and electromagnetic ion cyclotron (EMIC) triggered emissions takes place very effectively near the magnetic equator because of the variation of the ambient magnetic field. Efficient precipitations are caused by nonlinear trapping of relativistic electrons by electromagne…
Signatures of kinetic instabilities in the solar wind
Landi, Simone; Hellinger, Petr; Velli, Marco +3 more
An analysis of ion non-thermal properties in the fast solar wind based on Ulysses data is reported. The radial evolution of the main proton moments (density, temperature, and drift velocities) and their empirical correlations with other plasma parameters are investigated in detail and compared with theoretical expectations. The stability of the pl…
Statistical analysis of EMIC waves in plasmaspheric plumes from Cluster observations
Bortnik, J.; Mann, I. R.; Darrouzet, F. +1 more
electromagnetic ion cyclotron (EMIC) wave generation in plasmaspheric plumes has been the subject of extensive discussion. Theory predicts that regions of detached cold, dense plasma immersed in relatively low background magnetic field should aid EMIC wave growth and may provide conditions for interaction between the EMIC waves and relativistic (M…