Theoretical astrophysics and plasma physics at RPC

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Adaptive critical balance and firehose instability in an expanding, turbulent, collisionless plasma

(2021)

Authors:

AFA Bott, L Arzamasskiy, MW Kunz, E Quataert, J Squire
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Modes of a stellar system I: Ergodic systems

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 507:2 (2021) 2241-2252

Authors:

Jun Yan Lau, James Binney
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Observations of Short‐Period Ion‐Scale Current Sheet Flapping

Journal of Geophysical Research: Space Physics American Geophysical Union (AGU) 126:8 (2021) e2021JA029152

Authors:

L Richard, Yu V Khotyaintsev, DB Graham, MI Sitnov, O Le Contel, P‐A Lindqvist

Abstract:

AbstractKink‐like flapping motions of current sheets are commonly observed in the magnetotail. Such oscillations have periods of a few minutes down to a few seconds and they propagate toward the flanks of the plasma sheet. Here, we report a short‐period ( s) flapping event of a thin current sheet observed by the Magnetospheric Multiscale spacecraft in the dusk‐side plasma sheet following a fast Earthward plasma flow. We characterize the flapping structure using the multi‐spacecraft spatiotemporal derivative and timing methods, and we find that the wave‐like structure is propagating along the average current direction with a phase velocity comparable to the ion velocity. We show that the wavelength of the oscillating current sheet scales with its thickness as expected for a drift‐kink mode. The decoupling of the ion bulk motion from the electron bulk motion suggests that the current sheet is thin. We discuss the presence of the lower hybrid waves associated with gradients of density as a broadening process of the thin current sheet.
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Probabilistic distribution functions

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 506:3 (2021) 4007-4010

Authors:

Jun Yan Lau, James Binney
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Modes of a stellar system II: non-ergodic systems

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 507:2 (2021) 2562-2567

Authors:

Jun Yan Lau, James Binney
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