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Article
Open AccessParticle-sounding of the spatial structure of kinetic Alfvén waves
Kinetic Alfvén waves (KAWs) are ubiquitous throughout the plasma universe. Although they are broadly believed to provide a potential approach for energy exchange between electromagnetic fields and plasma parti...
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Article
Open AccessSimultaneous macroscale and microscale wave–ion interaction in near-earth space plasmas
Identifying how energy transfer proceeds from macroscales down to microscales in collisionless plasmas is at the forefront of astrophysics and space physics. It provides information on the evolution of involve...
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Article
Open AccessObservational evidence of ring current in the magnetosphere of Mercury
The magnetic gradient and curvature drift of energetic ions can form a longitudinal electric current around a planet known as the ring current, that has been observed in the intrinsic magnetospheres of Earth, ...
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Article
On the Relationship Between Shear Alfvén Waves, Auroral Electron Acceleration, and Field Line Resonances
This article describes the relationship between shear Alfvén waves and auroral electron acceleration, with an emphasis on long-period standing waves that correlate with redline auroral arcs in the Earth’s magn...
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Article
Quiet, Discrete Auroral Arcs: Acceleration Mechanisms
The theory of the acceleration of auroral particles is reviewed, focusing on developments in the last 15 years. We discuss elementary plasma physics processes leading to acceleration of electrons to energies c...
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Article
Open AccessMMS observations of electron scale magnetic cavity embedded in proton scale magnetic cavity
Magnetic cavities (sometimes referred to as magnetic holes) at electron kinetic scale are thought to be one of the extremely small intermittent structures formed in magnetized turbulent plasmas, where the turb...
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Article
Discovery of the action of a geophysical synchrotron in the Earth’s Van Allen radiation belts
Although the Earth’s Van Allen radiation belts were discovered over 50 years ago, the dominant processes responsible for relativistic electron acceleration, transport and loss remain poorly understood. Here we...
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Article
Role of ionospheric effects and plasma sheet dynamics in the formation of auroral arcs
At the ionospheric level, the substorm onset (expansion phase) is marked by the initial brightening and subsequent breakup of a pre-existing auroral arc. According to the field line resonance (FLR) wave model,...
