M. R. Argall
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View article: Electron and Ion Dynamics in Reconnection Diffusion Regions
Electron and Ion Dynamics in Reconnection Diffusion Regions Open
Magnetic reconnection is a fundamental plasma process responsible for the sometimes explosive release of magnetic energy in space and laboratory plasmas. Inside the diffusion regions of magnetic reconnection, the plasma becomes demagnetize…
View article: Magnetic Waves Excited by Newborn Inner-source Pickup H<sup>+</sup> Measured by the Voyager Spacecraft Inside 3 au
Magnetic Waves Excited by Newborn Inner-source Pickup H<sup>+</sup> Measured by the Voyager Spacecraft Inside 3 au Open
In S. J. Hollick et al., we surveyed the Voyager magnetic field data from launch through 1990 where the Voyagers 1 and 2 spacecraft reach 43.5 au and 33.6 au, respectively. We identified 637 intervals of wave activity that could be attribu…
View article: The evolution of CME sheath turbulence from L1 to Earth: Wind and MMS observations of the 2023-04-23 CME
The evolution of CME sheath turbulence from L1 to Earth: Wind and MMS observations of the 2023-04-23 CME Open
An interplanetary shock driven by a coronal mass ejection (CME) containing an interval of sub-Alfvénic flow impacted Earth on April 23, 2024. In this article, we analyze the turbulence in the sheath region between the shock and CME to dete…
View article: Clustering of Global Magnetospheric Observations
Clustering of Global Magnetospheric Observations Open
The use of supervised methods in space science have demonstrated powerful capability in classification tasks, but purely unsupervised methods have been less utilized for the classification of spacecraft observations. We use a combination o…
View article: High-latitude Observations of Dissipation-range Turbulence by the Ulysses Spacecraft during the Solar Minimum of 1993–96: The Spectral Break and Anisotropy
High-latitude Observations of Dissipation-range Turbulence by the Ulysses Spacecraft during the Solar Minimum of 1993–96: The Spectral Break and Anisotropy Open
We examine Ulysses magnetic field observations from 1993 to 1996 as the spacecraft made its first fast-latitude scan from the southern to the northern hemisphere. Most of the observations we use are representative of high-latitude solar mi…
View article: Advanced Methods for Analyzing in-Situ Observations of Magnetic Reconnection
Advanced Methods for Analyzing in-Situ Observations of Magnetic Reconnection Open
View article: Generalized Time‐Series Analysis for In Situ Spacecraft Observations: Anomaly Detection and Data Prioritization Using Principal Components Analysis and Unsupervised Clustering
Generalized Time‐Series Analysis for In Situ Spacecraft Observations: Anomaly Detection and Data Prioritization Using Principal Components Analysis and Unsupervised Clustering Open
In situ spacecraft observations are critical to our study and understanding of the various phenomena that couple mass, momentum, and energy throughout near‐Earth space and beyond. However, on‐orbit telemetry constraints can severely limit …
View article: Earth's Alfvén Wings Driven by the April 2023 Coronal Mass Ejection
Earth's Alfvén Wings Driven by the April 2023 Coronal Mass Ejection Open
We report a rare regime of Earth's magnetosphere interaction with sub‐Alfvénic solar wind in which the windsock‐like magnetosphere transforms into one with Alfvén wings. In the magnetic cloud of a Coronal Mass Ejection (CME) on 24 April 20…
View article: MMS Observations of Oscillating Energy Conversion and Electron Vorticity in an Electron‐Scale Layer Within a Southward Magnetopause Reconnection Exhaust
MMS Observations of Oscillating Energy Conversion and Electron Vorticity in an Electron‐Scale Layer Within a Southward Magnetopause Reconnection Exhaust Open
The MMS satellites traversed a ∼6 d i ‐wide and ∼500 km/s southward reconnection exhaust at the dayside magnetopause on 6 December 2015 and ∼29 d i from the associated X‐line region. A narrow ∼0.26–0.34 d i layer of enhanced ±3.5 nW/m 3 os…
View article: Generalized Time-Series Analysis for In-Situ Spacecraft Observations: Anomaly Detection and Data Prioritization using Principal Components Analysis and Unsupervised Clustering
Generalized Time-Series Analysis for In-Situ Spacecraft Observations: Anomaly Detection and Data Prioritization using Principal Components Analysis and Unsupervised Clustering Open
In-situ spacecraft observations are critical to our study and understanding of the various phenomena that couple mass, momentum, and energy throughout near-Earth space and beyond. However, on-orbit telemetry constraints can severely limit …
View article: Turbulence properties and kinetic signatures of electron in Kelvin-Helmholtz waves during a geomagnetic storm
Turbulence properties and kinetic signatures of electron in Kelvin-Helmholtz waves during a geomagnetic storm Open
We present a comprehensive study of Magnetospheric Multiscale (MMS) spacecraft encounter with KHI during a geomagnetic storm, focusing on elucidating key turbulence properties and reconnection signatures observed at the edges of KH vortice…
View article: Global Magnetic Reconnection During Sustained Sub‐Alfvénic Solar Wind Driving
Global Magnetic Reconnection During Sustained Sub‐Alfvénic Solar Wind Driving Open
When the solar wind speed falls below the local Alfvén speed, the magnetotail transforms into an Alfvén wing configuration. A Grid Agnostic Magnetohydrodynamics for Extended Research Applications (GAMERA) simulation of Earth's magnetospher…
View article: Earth's Alfvén wings driven by the April 2023 Coronal Mass Ejection
Earth's Alfvén wings driven by the April 2023 Coronal Mass Ejection Open
We report a rare regime of Earth's magnetosphere interaction with sub-Alfvénic solar wind in which the windsock-like magnetosphere transforms into one with Alfvén wings. In the magnetic cloud of a Coronal Mass Ejection (CME) on April 24, 2…
View article: Higher-order nonequilibrium term: Effective power density quantifying evolution towards or away from local thermodynamic equilibrium
Higher-order nonequilibrium term: Effective power density quantifying evolution towards or away from local thermodynamic equilibrium Open
A common approach to assess the nature of energy conversion in a classical fluid or plasma is to compare power densities of the various possible energy conversion mechanisms. A leading research area is quantifying energy conversion for sys…
View article: Clustering of Global Magnetospheric Observations
Clustering of Global Magnetospheric Observations Open
The use of supervised methods in space science have demonstrated powerful capability in classification tasks, but unsupervised methods have been less utilized for the clustering of spacecraft observations. We use a combination of unsupervi…
View article: Laboratory Study of Collisionless Magnetic Reconnection
Laboratory Study of Collisionless Magnetic Reconnection Open
View article: HelioSwarm: A Multipoint, Multiscale Mission to Characterize Turbulence
HelioSwarm: A Multipoint, Multiscale Mission to Characterize Turbulence Open
View article: Critical Solar Wind Measurements Required For the Next Generation Space Weather Prediction Mission: Science Motivation for the Seven Sisters Mission
Critical Solar Wind Measurements Required For the Next Generation Space Weather Prediction Mission: Science Motivation for the Seven Sisters Mission Open
Whitepaper #298 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: laboratory space plasma physics; space-based missions/projects; user-need-driven basic space weathe…
View article: Seven Sisters—Pathfinder Mission to Protect Humanity from Space Weather
Seven Sisters—Pathfinder Mission to Protect Humanity from Space Weather Open
Whitepaper #299 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: space weather research/operations/research loop; space weather research…
View article: Enabling Unprecedented Exploration of Kinetic Plasma Phenomena: Utilizing and Reaching Beyond the MMS FPI Breakthrough
Enabling Unprecedented Exploration of Kinetic Plasma Phenomena: Utilizing and Reaching Beyond the MMS FPI Breakthrough Open
Whitepaper #368 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: planetary magnetospheres; fundamental space plasma theory; space-based missions/projects.
View article: Intelligent Missions in the Living Heliospheric System Observatory
Intelligent Missions in the Living Heliospheric System Observatory Open
Whitepaper #016 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research; infrastructure/workforce/other programmatic. Additional topics: other basic research; system science; research tools a…
View article: Laboratory Study of Collisionless Magnetic Reconnection
Laboratory Study of Collisionless Magnetic Reconnection Open
A concise review is given on the past two decades' results from laboratory experiments on collisionless magnetic reconnection in direct relation with space measurements, especially by Magnetospheric Multiscale (MMS) mission. Highlights inc…
View article: Simulation dataset for "HORNET - A Power Density Quantifying Out of Thermodynamic Equilibrium Energy Conversion"
Simulation dataset for "HORNET - A Power Density Quantifying Out of Thermodynamic Equilibrium Energy Conversion" Open
Simulation dataset for reproducing figures used in the manuscript
View article: Simulation dataset for "HORNET - A Power Density Quantifying Out of Thermodynamic Equilibrium Energy Conversion"
Simulation dataset for "HORNET - A Power Density Quantifying Out of Thermodynamic Equilibrium Energy Conversion" Open
Simulation dataset for reproducing figures used in the manuscript
View article: Advanced methods for analyzing in-situ observations of magnetic reconnection
Advanced methods for analyzing in-situ observations of magnetic reconnection Open
There is ample evidence for magnetic reconnection in the solar system, but it is a nontrivial task to visualize, to determine the proper approaches and frames to study, and in turn to elucidate the physical processes at work in reconnectio…
View article: HelioSwarm: A Multipoint, Multiscale Mission to Characterize Turbulence
HelioSwarm: A Multipoint, Multiscale Mission to Characterize Turbulence Open
HelioSwarm (HS) is a NASA Medium-Class Explorer mission of the Heliophysics Division designed to explore the dynamic three-dimensional mechanisms controlling the physics of plasma turbulence, a ubiquitous process occurring in the heliosphe…
View article: Seven Sisters: a mission to study fundamental plasma physical processes in the solar wind and a pathfinder to advance space weather prediction
Seven Sisters: a mission to study fundamental plasma physical processes in the solar wind and a pathfinder to advance space weather prediction Open
This paper summarizes the Seven Sisters solar wind mission concept and the outstanding science questions motivating the mission science objectives. The Seven Sisters mission includes seven individual spacecraft designed to uncover fundamen…
View article: Chorus Wave Properties From Van Allen Probes: Quantifying the Impact of the Sheath Corrected Electric Field
Chorus Wave Properties From Van Allen Probes: Quantifying the Impact of the Sheath Corrected Electric Field Open
A sheath impedance model has recently been developed to describe how the variable coupling impedance between the Van Allen Probes instrumentation and the ambient plasma affects both the amplitude and phase of electric field wave measuremen…
View article: Temporal, Spatial, and Velocity‐Space Variations of Electron Phase Space Density Measurements at the Magnetopause
Temporal, Spatial, and Velocity‐Space Variations of Electron Phase Space Density Measurements at the Magnetopause Open
Temporal, spatial, and velocity‐space variations of electron phase space density are measured observationally and compared for the first time using the four magnetospheric multiscale (MMS) spacecraft at Earth's magnetopause. Equipped with …
View article: Low-frequency Waves Due to Newborn Interstellar Pickup Ions Observed from 43 to 47 au by the Voyager 1 Spacecraft
Low-frequency Waves Due to Newborn Interstellar Pickup Ions Observed from 43 to 47 au by the Voyager 1 Spacecraft Open
Interstellar neutral atoms enter the heliosphere at a relatively slow speed corresponding to the motion of the Sun through the local interstellar medium, which is approximately 25 km s −1 . Neutral hydrogen atoms enter from the approximate…