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Viviane Pierrard

Editor, JGR: Space Physics

Diagrams from the study.
Posted inEditors' Highlights

New Empirical Model of the Flux in the Magnetosheath

by Viviane Pierrard 6 January 202520 December 2024

A new study presents a model that reconstructs the plasma flux in the Earth’s magnetosheath.

Ions moving in the Earth’s dipole magnetic field are represented by colored dots in equatorial phase coordinates.
Posted inEditors' Highlights

Modification of Energetic Particles Loss Cone During Storms

by Viviane Pierrard 17 August 202214 October 2022

The loss cone of energetic particles in the Earth’s inner magnetosphere is substantially modified during disturbed times, with important implications for the radiation-belt and ring current modeling.

Figures showing global distributions of calculated height-integrated Pedersen conductance and Hall conductance.
Posted inEditors' Highlights

Meteoric Ions Influence Conductance in the Jovian Ionosphere

by Viviane Pierrard 29 April 20227 September 2022

Meteoric ions dominate the Jovian lower ionosphere due to their long lifetimes. Due to the large densities of the meteoric ions, conductance is enhanced independently of local time.

Graphic showing what the JEDI instrument can see of Io and Europa from its trajectory
Posted inEditors' Highlights

New Energetic Neutral Atom Emissions from Jupiter, Io, and Europa

by Viviane Pierrard 15 June 202011 April 2023

The first Jovian off-equator Energetic Neutral Atom viewings reveal distinct emissions from Jupiter and the orbits of Io and Europa: Energetic particle injections surprisingly occur inside Io’s orbit.

Plots of average wave electric field power spectral densities on the nightside
Posted inEditors' Highlights

Human-made Emissions Modify Electron Space Environment

by Viviane Pierrard 2 August 20198 August 2022

Very Low Frequency transmitters used for communications with submarines modify the dynamics of energetic electrons in the inner radiation belt and the slot region.

Posted inEditors' Highlights

Red and Green Aurora Stop and Go for Different Reasons

by Viviane Pierrard 5 July 201911 August 2022

Green-line arc is found to be embedded within large-scale upward field aligned currents while red-line-only arc is found to be associated with low-energy precipitation bursts.

Posted inEditors' Highlights

Energetic Electrons Can Penetrate the Stratosphere

by Viviane Pierrard 17 October 201816 March 2023

Precipitations of electrons with energies greater than 30 kiloelectron volts from the slot region penetrate at low altitude and can contribute to destroy ozone.

A view of a Washington, D.C., skyline from the Potomac River at night. The Lincoln Memorial (at left) and the Washington Monument (at right) are lit against a purple sky. Over the water of the Potomac appear the text “#AGU24 coverage from Eos.”

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First Benchmarking System of Global Hydrological Models

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