Presentations and talks
This page includes a curated list of recent conference presentations, posters and general talks I have given. A more complete list of all my previous presentations and talks can be
here.
July 13, 2022
Talk, Magnetospheres of Outer Planets Meeting 2022, Liège, Belgium
Plasma is injected into the magnetospheres of both gas giants in the outer planets from sources located on satellites orbiting them, Io at Jupiter and Enceladus at Saturn. Material ejected from these moons forms tori surrounding their planetary bodies at distances corresponding to the source’s orbit, however these regions are not continually expanding and therefore must have loss mechanisms associated with them. The processes responsible for loss in the two systems are ejection as energetic neutrals and by bulk transport into sink regions in the outer magnetosphere, though the proportion of material removed by these varies. The physical process generally considered to be responsible for bulk transport is the centrifugal-interchange instability, analogous to the Rayleigh-Taylor instability, but with centrifugal force replacing gravity. This mechanism allows magnetic flux tubes containing hot, tenuous plasma to exchange places with tubes containing cool, dense plasma, moving material from the inner to outer magnetosphere whilst returning magnetic flux to the inner magnetosphere. In order to examine the transport we have developed a full hybrid kinetic-ion, fluid-electron plasma model in 2.5-dimensions, JERICHO. The technique of hybrid modelling allows for probing of plasma motions from the scale of planetary-radii down to the ion-inertial length scale, considering constituent ion species kinetically as charged particles and forming the electrons into a single magnetised fluid continuum. This allows for insights into particle motions on spatial scales below the size of the magnetic flux tubes. Results from this model will allow for the examination of bulk transport on spatial scales not currently accessible with state-of-the-art models, improving understanding of mechanisms responsible for moving particles between flux tubes and from the inner to the outer magnetosphere. We have applied JERICHO to both the Jovian and Saturnian systems and this presentation will examine the distribution of ions, current densities and electromagnetic field perturbations, analysing how they evolve both spatially and temporally. This will allow for insights into the radial motions of plasma directed radially outwards, as well as the corresponding response in the associated fields.
May 27, 2022
Talk, EGU General Assembly 2022, Austria Center Vienna, Vienna, Austria
The Jovian magnetosphere is loaded internally with material from the volcanic moon of Io, which is ionised and brought into co-rotation forming the Io plasma torus. Plasma is removed from the torus mainly via ejection as energetic neutrals and by bulk transport into sink regions in the outer magnetosphere.
December 16, 2021
Poster, AGU Fall Meeting 2022, Hybrid Meeting, New Orleans, Louisiana, USA
Plasma in the Jovian magnetosphere is removed from Io’s torus mainly via ejection as energetic neutrals and by bulk transport into sink regions in the outer magnetosphere. The physical process generally considered to be responsible for bulk transport is the centrifugal-interchange instability, analogous to the Rayleigh-Taylor instability, but with centrifugal force replacing gravity. This mechanism allows magnetic flux tubes containing hot, tenuous plasma to exchange places with tubes containing cool, dense plasma, moving material from the inner to outer magnetosphere whilst returning magnetic flux to the inner magnetosphere. In order to examine the transport we have developed a full hybrid kinetic-ion, fluid-electron plasma model in 2.5-dimensions, JERICHO. The technique of hybrid modelling allows for probing of plasma motions from the scale of planetary-radii down to the ion-inertial length scale, considering constituent ion species kinetically as charged particles and forming the electrons into a single magnetised fluid continuum. This allows for insights into particle motions on spatial scales below the size of the magnetic flux tubes. Results from this model will allow for the examination of bulk transport on spatial scales not currently accessible with state-of-the-art models, improving understanding of mechanisms responsible for moving particles between flux tubes and from the inner to the outer magnetosphere. In this presentation we will analysis the latest results from the model as well as examining the process of coupling the simulated magnetosphere to a Jovian ionosphere.
July 15, 2021
Talk, Numerical Modelling of Planetary Magnetospheres, RAS Specialist Discussion Meeting, Virtual Meeting, London, England
JERICHO is a full hybrid kinetic-ion, fluid-electron plasma model in 2.5-dimensions developed for the analysis of bulk transport in the Jovian magnetosphere. Plasma in the Jovian system is removed from Io’s torus mainly via ejection as energetic neutrals and by bulk transport into sink regions in the outer magnetosphere. The physical process generally considered to be responsible for bulk transport is the centrifugal-interchange instability, analogous to the Rayleigh-Taylor instability, but with centrifugal force replacing gravity. This mechanism allows magnetic flux tubes containing hot, tenuous plasma to exchange places with tubes containing cool, dense plasma, moving material from the inner to outer magnetosphere whilst returning magnetic flux to the inner magnetosphere. The technique of hybrid modelling allows for probing of plasma motions from the scale of planetary-radii down to the ion-inertial length scale, considering constituent ion species kinetically as charged particles and forming the electrons into a single magnetised fluid continuum. This allows for insights into particle motions on spatial scales below the size of the magnetic flux tubes. Results from this model will allow for the examination of bulk transport on spatial scales not currently accessible with state-of-the-art models, improving understanding of mechanisms responsible for moving constituent ion species radially outwards from the inner to outer magnetosphere. In this presentation we will examine the structure of the model logic and numerics before analysing the latest results from the model.
July 15, 2021
Poster, Magnetospheres of Outer Planets Meeting 2021, Virtual Meeting, Liege, Belgium
Plasma in the Jovian magnetosphere is removed from Io’s torus mainly via ejection as energetic neutrals and by bulk transport into sink regions in the outer magnetosphere. The physical process generally considered to be responsible for bulk transport is the centrifugal-interchange instability, analogous to the Rayleigh-Taylor instability, but with centrifugal force replacing gravity. This mechanism allows magnetic flux tubes containing hot, tenuous plasma to exchange places with tubes containing cool, dense plasma, moving material from the inner to outer magnetosphere whilst returning magnetic flux to the planet. In order to examine the transport we have developed a full hybrid kinetic-ion, fluid-electron plasma model in 2.5-dimensions, JERICHO. The technique of hybrid modelling allows for probing of plasma motions down to the ion-inertial length scale, considering constituent ion species kinetically as charged particles and forming the electrons into a single magnetised fluid continuum, allowing for insights into particle motions on spatial scales below the size of the magnetic flux tubes. Additionally, JERICHO provides a computational framework capable of capturing a wide range of flow dynamics, up to spatial scales on the order of planetary radii. Results from this model will allow for the examination of bulk transport on spatial scales not currently accessible with state-of-the-art models, improving understanding of mechanisms responsible for moving particles between flux tubes and from the inner to the outer magnetosphere. In this presentation we will examine the latest simulation results from JERICHO, initialised with Jovian parameters.
