Dr Louis Richard: Publications

Turbulence in Magnetic Reconnection Jets from Injection to Sub-Ion Scales

ArXiv 2303.08693 (2023)

Authors:

L Richard, L Sorriso-Valvo, E Yordanova, DB Graham, Yu V Khotyaintsev

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Fast Ion Isotropization by Current Sheet Scattering in Magnetic Reconnection Jets

ArXiv 2301.10139 (2023)

Authors:

L Richard, Yu V Khotyaintsev, DB Graham, A Vaivads, DJ Gershman, CT Russell

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Are Dipolarization Fronts a Typical Feature of Magnetotail Plasma Jets Fronts?

Geophysical Research Letters American Geophysical Union (AGU) 49:22 (2022) e2022GL101693

Authors:

L Richard, Yu V Khotyaintsev, DB Graham, CT Russell

Abstract:

AbstractPlasma jets are ubiquitous in the Earth's magnetotail. Plasma jet fronts (JFs) are a seat of particle acceleration and energy conversion. JFs are commonly associated with dipolarization fronts (DFs), which are often characterized by solitary sharp large‐amplitude increases in the northward component of the magnetic field Bz. However, MHD and kinetic instabilities can develop at JFs and disturb the front structure which questions on the occurrence of solitary DFs at the JFs. We investigate the structure of JFs using 5 years (2017–2021) of the Magnetospheric Multiscale observations in the central plasma sheet (CPS) in the Earth's magnetotail. We compiled a database of 2394 CPS jets. We find that 42% of the JFs are associated with large‐amplitude changes in Bz. However, solitary DFs constitute a quarter of these large‐amplitude events, while the rest are associated with more complex structures.

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Are Dipolarization Fronts a Typical Feature of Magnetotail Plasma Jets Fronts?

ArXiv 2208.10333 (2022)

Authors:

L Richard, Yu V Khotyaintsev, DB Graham, CT Russell

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Proton and Helium Ion Acceleration at Magnetotail Plasma Jets

Journal of Geophysical Research: Space Physics American Geophysical Union (AGU) 127:8 (2022) e2022JA030430

Authors:

L Richard, Yu V Khotyaintsev, DB Graham, A Vaivads, R Nikoukar, IJ Cohen, DL Turner, SA Fuselier, CT Russell

Abstract:

AbstractWe investigate two flow bursts in a series of Earthward bursty bulk flows (BBFs) observed by the Magnetospheric Multiscale spacecraft in Earth's magnetotail at (−24, 7, 4) RE in Geocentric Solar Magnetospheric coordinates. At the leading edges of the BBFs, we observe complex magnetic field structures. In particular, we focus on one BBF which contains large‐amplitude magnetic field fluctuations on the time scale of the proton gyroperiod, and another with a large scale dipolarization. For both events, the magnetic field structures are associated with flux increases of supra‐thermal ions with energies ≳100 keV. We observe that helium ions dominate the ion flux at energies ≳150 keV. We investigate the ion acceleration mechanism and its dependence on the mass and charge state of H+ and He2+ ions. We show that for both events, the ions with gyroradii smaller than the dawn‐dusk scale of the structure are accelerated by the ion bulk flow. For ions with larger gyroradii, the acceleration is likely due to a localized spatially limited electric field for the event with a large‐scale dipolarization. For the event with fluctuating magnetic field, the acceleration of ions with gyroradii comparable with the scale of the magnetic fluctuations can be explained by resonance acceleration.

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Dr Louis Richard

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Turbulence in Magnetic Reconnection Jets from Injection to Sub-Ion Scales

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Fast Ion Isotropization by Current Sheet Scattering in Magnetic Reconnection Jets

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Are Dipolarization Fronts a Typical Feature of Magnetotail Plasma Jets Fronts?

Authors:

Abstract:

Are Dipolarization Fronts a Typical Feature of Magnetotail Plasma Jets Fronts?

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Proton and Helium Ion Acceleration at Magnetotail Plasma Jets

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Abstract:

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Dr Louis Richard

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Turbulence in Magnetic Reconnection Jets from Injection to Sub-Ion Scales

Authors:

Fast Ion Isotropization by Current Sheet Scattering in Magnetic Reconnection Jets

Authors:

Are Dipolarization Fronts a Typical Feature of Magnetotail Plasma Jets Fronts?

Authors:

Abstract:

Are Dipolarization Fronts a Typical Feature of Magnetotail Plasma Jets Fronts?

Authors:

Proton and Helium Ion Acceleration at Magnetotail Plasma Jets

Authors:

Abstract: