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Courses
  • PPP
    Principles of Planetary Physics

  • OGAPE
    Our Golden Age of Planetary Exploration

  • PSS
    Physics of the Solar System

  • TPS
    The Physics of the Sun

  • PPASSA
    Plasma Physics with Astrophysical and Solar System Applications

Grants
  • Funding agency logo
    Collaborative Research: ANSWERS: Solar Energetic Particles, Solar Neutrons, and a New Space Weather Facility in Hawaii

    Principal Investigator (PI)

    2022

    $185.6K
    Active
  • Funding agency logo
    Our Heliospheric Shield

    Principal Investigator (PI)

    2022

    $80.0K
    Active
  • Funding agency logo
    Tracking Mechanisms Efficiently Accelerating Charged Particles at Shocks at Multiple Heliospheric Distances out to ~1.5 AU

    Co-Investigator (COI)

    2021

    $390.5K
    Active
  • Funding agency logo
    Interpreting the Signature of GeV-TeV Galactic Cosmic Rays on the Solar Surface via Turbulent Transport Within Inner Heliosphere and Solar Atmosphere

    Co-Investigator (COI)

    2021

    $354.5K
    Active
  • Funding agency logo
    Energetic Particles Transport in the Inner Heliosphere Switchbacks Turbulent Environment

    Co-Investigator (COI)

    2021

    $318.6K
    Active
  • Funding agency logo
    High-Energy Particle Acceleration by Extreme Coronal Shocks

    Principal Investigator (PI)

    2021

    $78.7K
    Active
  • Funding agency logo
    A Multi-spacecraft Approach to Understand the Spectral and Temporal Evolution in Large Solar Energetic Particle Events

    Principal Investigator (PI)

    2020

    $152.9K
    Active
  • Funding agency logo
    Energetics of Solar Eruptions from the Chromosphere to the Inner Heliosphere Program

    Principal Investigator (PI)

    2020

    $139.7K
    Active
  • Funding agency logo
    Our Heliospheric Shield

    Principal Investigator (PI)

    2020

    $80.0K
    Active
  • Funding agency logo
    Collaborative Research: Transport Processes Affecting High-Energy Solar Energetic Particles Observed at Earth

    Principal Investigator (PI)

    2019

    $470.8K
    Active
News
  • Close Encounter with the Sun

    2019

  • UA Expertise Key in Mapping Moon's Surface

    2019

  • UA Scientists Gear Up to 'Touch the Sun'

    2018

  • Biosphere 2 Dedicates Lectures to Memory of Michael J. Drake

    2011

  • UA Scientists Study Voyager 2's Plunge Through the Heliosphere

    2007

  • LPL Public Lectures Present Latest Solar System News

    2006

  • USS Arizona Bell Rings to Honor Outstanding Achievement

    2005

Publications (195)
Recent
  • Electrostatic Plasma Wave Excitations at the Interplanetary Shocks

    2023

  • Unexpected energetic particle observations near the Sun by Parker Solar Probe and Solar Orbiter

    2023

  • Turbulence and Diffusive Transport of Cosmic Rays in the Very Local Interstellar Medium

    2023

  • Probing the Length of the Heliospheric Tail with Energetic Neutral Atoms (ENAs) from 0.52 to 80 keV

    2023

  • An Anomalous Cosmic-Ray Mediated Termination Shock: Implications for Energetic Neutral Atoms

    2023

  • Multi-spacecraft Observations of Heavy Ion Characteristics in the 28 October 2021 Solar Energetic Particle Event

    2022

  • STEREO/ACE Observations of Suprathermal and Energetic Ion Spikes in Interplanetary Shocks

    2022

  • Recent Developments in Particle Acceleration at Shocks: Theory and Observations

    2022

  • The First 3 Years of ISOIS Energetic Electron Measurements

    2022

  • Solar Energetic Particle Acceleration at a Spherical Shock with the Shock Normal Angle θBn Evolving in Space and Time

    2022

  • On the Energy Dependence of Galactic Cosmic Ray Anisotropies in the Very Local Interstellar Medium

    2022

  • The Effect of Large-scale Turbulence on Energetic Particle Profiles across Interplanetary Shocks

    2022

  • In Situ Measurement of the Energy Fraction in Suprathermal and Energetic Particles at ACE, Wind, and PSP Interplanetary Shocks

    2022

  • Numerical Modeling of Energetic Electron Acceleration, Transport, and Emission in Solar Flares: Connecting Loop-top and Footpoint Hard X-Ray Sources

    2022

  • Advancing Theory and Modeling Efforts in Heliophysics

    2022

  • PSP/IS\ensuremath{\odot}IS Observation of a Solar Energetic Particle Event Associated with a Streamer Blowout Coronal Mass Ejection during Encounter 6

    2022

  • Martian Ionospheric Magnetic Fluctuations Below 200 km

    2022

  • The Early History of Heliospheric Science and the Spacecraft That Made It Possible

    2022

  • On the energization of pickup ions downstream of the heliosheric termination shock, by comparing 0.52-55 keV observed ENA spectra to simulated ENAs inferred by proton hybrid simulations.

    2022

  • Parker Solar Probe's Measurements of the 29 November 2020 Solar Energetic Particle Event

    2022

  • PSP/IS⊙IS Observation of a Solar Energetic Particle Event Associated with a Streamer Blowout Coronal Mass Ejection during Encounter 6

    2022

  • Double-power-law Feature of Energetic Particles Accelerated at Coronal Shocks

    2022

  • Confronting Current and Future Imaging Spectroscopic Observations with Integrated Multiphysics Models

    2022

  • The Effect of the Fluctuating Interplanetary Magnetic Field on the Cosmic Ray Intensity Profile of the Ground-level Enhancement (GLE) Events

    2022

  • On the Energization of Pickup Ions Downstream of the Heliospheric Termination Shock by Comparing 0.52-55 keV Observed Energetic Neutral Atom Spectra to Ones Inferred from Proton Hybrid Simulations

    2022

  • New Data from the IS??IS instrument Suite on Parker Solar Probe

    2022

  • Solar Energetic Particle Acceleration at a Spherical Shock with the Shock Normal Angle \{\textbackslashtheta \}\_\{\{B\}\_\{n\}\} Evolving in Space and Time

    2022

  • Variable Ion Compositions of Solar Energetic Particle Events in the Inner Heliosphere: A Field Line Braiding Model with Compound Injections

    2022

  • Heavy Ion Characteristics Observed by Multiple Spacecraft Observations in the 28 October 2021 Solar Energetic Particle Event

    2022

  • Anomalous Cosmic Rays and Heliospheric Energetic Particles

    2022

  • Parker Solar Probe Observations of Near-Sun 3He-rich Solar Energetic Particle Events

    2022

  • A Model of Double Coronal Hard X-Ray Sources in Solar Flares

    2022

  • Energy Balance at Interplanetary Shocks: In-situ Measurement of the Fraction in Supra-thermal and Energetic Ions with ACE and Wind

    2022

  • Unfolding of the vortical amplification of the magnetic field at inward shocks of Supernova remnant Cassiopeia A

    2022

  • Energetic Electron Observations by Parker Solar Probe/IS\ensuremath{\odot}IS during the First Widespread SEP Event of Solar Cycle 25 on 2020 November 29

    2021

  • Energetic particle behavior in near-Sun magnetic field switchbacks from PSP

    2021

  • The Transport Equation for the Dispersal of Passive Tracers in a Nonuniform Turbulent Fluid: Numerical Simulations

    2021

  • Energy Dependence of GCR Anisotropies in the VLISM

    2021

  • Magnetic field line random walk and solar energetic particle path lengths. Stochastic theory and PSP/IS\ensuremath{\odot}IS observations

    2021

  • Solar energetic particle heavy ion properties in the widespread event of 2020 November 29

    2021

  • A Turbulent Heliosheath Driven by the Rayleigh-Taylor Instability

    2021

  • The roles of magnetic reconnection and flare termination shock in accelerating particles in solar flares

    2021

  • A new view of energetic particles from stream interaction regions observed by Parker Solar Probe

    2021

  • Hybrid Simulations of Interstellar Pickup Protons Accelerated at the Solar-wind Termination Shock at Multiple Locations

    2021

  • Plasma Waves in the Distant Martian Environment: Implications for Mars' Sphere of Influence

    2021

  • PSP/IS\ensuremath{\odot}IS observations of the 29 November 2020 solar energetic particle event

    2021

  • Shock Propagation and Associated Particle Acceleration in the Presence of Ambient Solar-Wind Turbulence

    2021

  • Comparative Analysis of the 2020 November 29 Solar Energetic Particle Event Observed by Parker Solar Probe

    2021

  • Energetic particle evolution during coronal mass ejection passage from 0.3 to 1 AU

    2021

  • PSP/IS$\odot$IS Observation of a Solar Energetic Particle Event Associated With a Streamer Blowout Coronal Mass Ejection During Encounter 6

    2021

  • Suprathermal Ion Energy spectra and Anisotropies near the Heliospheric Current Sheet crossing observed by the Parker Solar Probe during Encounter 7

    2021

  • Time evolution of stream interaction region energetic particle spectra in the inner heliosphere

    2021

  • Parker Solar Probe observations of He/H abundance variations in SEP events inside 0.5 au

    2021

  • Energy Balance at Interplanetary Shocks: In-situ Measurement of the Fraction in Supra-thermal and Energetic Particles with ACE and Wind

    2021

  • Energetic Particles Associated with a Coronal Mass Ejection Shock Interacting with a Convected Magnetic Structure

    2021

  • Using Magnetic Flux Conservation to Determine Heliosheath Speeds

    2021

  • Parker Solar Probe observations of helical structures as boundaries for energetic particles

    2021

  • Small, Low-energy, Dispersive Solar Energetic Particle Events Observed by Parker Solar Probe

    2020

  • Energetic Particle Observations from the Parker Solar Probe Using Combined Energy Spectra from the IS\ensuremath{\odot}IS Instrument Suite

    2020

  • $^3$He-rich Solar Energetic Particle Observations at the Parker Solar Probe and near Earth

    2020

  • The role of turbulence strength on the acceleration of transrelativistic electrons

    2020

  • Turbulence in the Local Interstellar Medium and the IBEX Ribbon

    2020

  • Magnetic Field Line Random Walk and Solar Energetic Particle Path Lengths: Stochastic Theory and PSP/ISoIS Observation

    2020

  • Observations of Energetic-particle Population Enhancements along Intermittent Structures near the Sun from the Parker Solar Probe

    2020

  • The Downwind Solar Wind: Model Comparison with Pioneer 10 Observations

    2020

  • Erratum: ``The Acceleration of Charged Particles at a Spherical Shock Moving through an Irregular Magnetic Field'' (2017, ApJ, 848, 123)

    2020

  • 3D propagation of relativistic solar protons through interplanetary space

    2020

  • Energetic Particle Increases Associated with Stream Interaction Regions

    2020

  • Analysis of the Internal Structure of the Streamer Blowout Observed by the Parker Solar Probe During the First Solar Encounter

    2020

  • Properties of Suprathermal-through-energetic He Ions Associated with Stream Interaction Regions Observed over the Parker Solar Probe's First Two Orbits

    2020

  • Seed Population Preconditioning and Acceleration Observed by the Parker Solar Probe

    2020

  • The Solar Orbiter magnetometer

    2020

  • Solar Energetic Particles Produced by a Slow Coronal Mass Ejection at \ensuremath{\sim}0.25 au

    2020

  • Dynamical Modulation of Solar Flare Electron Acceleration due to Plasmoid-shock Interactions in the Looptop Region

    2020

  • Observations of the 2019 April 4 Solar Energetic Particle Event at the Parker Solar Probe

    2020

  • Erratum: ``A New Model for the Heliosphere's 'IBEX Ribbon''' (2017, ApJL, 812, L9)

    2020

  • Bi-directional streaming of particles accelerated at the STEREO-A shock on 2008 March 9

    2020

  • CME-associated Energetic Ions at 0.23 au: Consideration of the Auroral Pressure Cooker Mechanism Operating in the Low Corona as a Possible Energization Process

    2020

  • Comparing Long-duration Gamma-Ray Flares and High-energy Solar Energetic Particles

    2019

  • The Acceleration and Confinement of Energetic Electrons by a Termination Shock in a Magnetic Trap: An Explanation for Nonthermal Loop-top Sources during Solar Flares

    2019

  • Particle Acceleration at Shocks Moving Through Turbulent Plasmas

    2019

  • Evolution of the Suprathermal Proton Population at Interplanetary Shocks

    2019

  • The Acceleration of Energetic Particles at Coronal Shocks and Emergence of a Double Power-law Feature in Particle Energy Spectra

    2019

  • Particle Acceleration at the Pileup Collision of the Twin Shock

    2019

  • ELF Waves in the Martian Ionosphere: Lightning, Field Line Resonances, and Instabilities?

    2019

  • Long Duration Gamma-ray Flares and High Energy Solar Energetic Particles: Is there a Connection?

    2019

  • Energetic Particle Transport and Acceleration at Interplanetary Shocks

    2018

  • Flat Proton Spectra in Large Solar Energetic Particle Events

    2018

  • Comparing Long Duration Gamma-ray Flares and High Energy Solar Energetic Particles; no

    2018

  • Interstellar Mapping and Acceleration Probe (IMAP): A New NASA Mission

    2018

  • Vortical Amplification of the Magnetic Field at an Inward Shock of Supernova Remnant Cassiopeia A

    2018

  • The Acceleration of Thermal Ions at a Strong, Quasi-Parallel Interplanetary Shock: A Hybrid Simulation

    2017

  • The Acceleration of Charged Particles at a Spherical Shock Moving through an Irregular Magnetic Field

    2017

  • Particle Acceleration in Two Converging Shocks

    2017

  • The Acceleration of High-energy Protons at Coronal Shocks: The Effect of Large-scale Streamer-like Magnetic Field Structures

    2017

  • Properties of the Fast Forward Shock Driven by the July 23 2012 Extreme Coronal Mass Ejection

    2016

  • Integrated Science Investigation of the Sun (ISIS): Design of the Energetic Particle Investigation

    2016

  • Large gradual solar energetic particle events

    2016

  • Pitch-angle Scattering of Energetic Charged Particles in Nearly Constant Magnitude Magnetic Turbulence

    2016

  • {Diffusive Shock Acceleration of High-energy Charged Particles at Fast Interplanetary Shocks: A Parameter Survey}

    2015

  • {Energetic particles, tangential discontinuities, and solar flux tubes}

    2015

  • {The Acceleration of Electrons at Collisionless Shocks Moving Through a Turbulent Magnetic Field}

    2015

  • {Broken Power-law Distributions from Low Coronal Compression Regions or Shocks}

    2015

  • {Particles Acceleration in Converged Two Shocks}

    2015

  • {Examining Particle Transport in Multi-Spacecraft $^{3}$He-Rich SEP Events}

    2015

  • {Particle Acceleration at Low Coronal Compression Regions and Shocks}

    2015

  • A NEW MODEL FOR THE HELIOSPHERE'S IBEX RIBBON

    2015

  • {Properties of the Fast Forward Shock Driven by the July 23 2012 Extreme Coronal Mass Ejection}

    2015

  • {Hybrid simulation of the interaction of solar wind protons with a concentrated lunar magnetic anomaly}

    2015

  • {Localized enhancements of energetic particles at oblique collisionless shocks}

    2015

  • {Effects of Large-Scale Simple Velocity Shear on a Fluctuating Interplanetary Magnetic Field}

    2015

  • {A Heliosphere Buffeted by Interstellar Turbulence?}

    2014

  • Small-scale gradients of charged particles in the heliospheric magnetic field

    2014

  • {The acceleration of charged particles from thermal to suprathermal energies at strong shocks in the solar wind}

    2014

  • {Synthesis of 3-D Coronal-Solar Wind Energetic Particle Acceleration Modules}

    2014

  • {Effect of Coherent Structures on Energetic Particle Intensity in the Solar Wind at 1 AU}

    2014

  • Cosmic-ray transport and interaction with shocks

    2013

  • The acceleration of thermal protons at parallel collisionless shocks: Three-dimensional hybrid simulations

    2013

  • Association of suprathermal particles with coherent structures and shocks

    2013

  • Particle acceleration at a flare termination shock: Effect of large-scale magnetic turbulence

    2012

  • On the amplification of magnetic field by a supernova blast shock wave in a turbulent medium

    2012

  • Suprathermal ions associated with strong interplanetary shocks

    2012

  • Shock acceleration of ions in the heliosphere

    2012

  • Energetic charged particles associated with strong interplanetary shocks

    2012

  • The acceleration of electrons at perpendicular shocks and its implication for solar energetic particle events

    2012

  • Early-time velocity autocorrelation for charged particles diffusion and drift in static magnetic turbulence

    2012

  • The longitudinal transport of energetic ions from impulsive solar flares in interplanetary space

    2012

  • SOLAR WIND 13: Proceedings of the Thirteenth International Solar Wind Conference

    2012

  • The acceleration mechanism of anomalous cosmic rays

    2012

  • The physics of partially ionized gas with applications to processes in the interstellar medium

    2011

  • Evidence of confinement of solar-energetic particles to interplanetary magnetic field lines

    2011

  • Interaction between inclined current sheets and the heliospheric termination shock

    2010

  • The effect of large-scale magnetic turbulence on the acceleration of electrons by perpendicular collisionless shocks

    2010

  • Thickness of the heliosheath, return of the pick-up ions, and voyager 1's crossing the heliopause

    2010

  • The origin of low-energy anomalous cosmic rays at the solar-wind termination shock

    2010

  • Reconnection and disconnection: Observations of suprathermal electron heat flux dropouts

    2010

  • Effects of interplanetary transport on derived energetic particle source strengths

    2010

  • The acceleration of inner-source pickup ions by a propagating interplanetary shock

    2010

  • Progress in the study of interplanetary discontinuities

    2010

  • The structure of the IBEX ribbon: A reflection of interstellar turbulence?

    2010

  • A re-interpretation of STEREO/STE observations and its consequences

    2009

  • Spatial offsets of interplanetary ion and electron source regions

    2009

  • The acceleration of stationary charged dust grains by propagating collisionless shock waves

    2009

  • Particle acceleration at a perpendicular shock in the limit of weak pitch-angle scattering

    2008

  • Multispacecraft analysis of energetic ion flux dropouts

    2008

  • The energy spectrum of energetic particles downstream of turbulent collisionless shocks

    2008

  • Magnetic field amplification by shocks in turbulent fluids

    2007

  • Large-scale turbulence, shocks, and charged-particle acceleration

    2007

  • The physics of particle acceleration at the heliospheric termination shock

    2007

  • Adiabatic compression acceleration of fast charged particles

    2007

  • A new phenomenon in impulsive-flare-associated energetic particles

    2007

  • Spectra of polar heliospheric fields and implications for field structure

    2007

  • Shock acceleration of high-energy cosmic rays: The importance of the magnetic-field angle

    2006

  • Variability of low-energy ion flux profiles on interplanetary shock fronts

    2006

  • Effect of a random magnetic field on the onset times of solar particle events

    2006

  • Test-particle numerical simulations of energetic particles near the termination shock

    2006

  • Solar orbiter neutral solar-wind detector

    2006

  • Acceleration of solar-energetic particles by shocks

    2006

  • Energetic particle intensities and anisotropies near the solar wind termination shock

    2006

  • A magnetometer for the Solar Orbiter Mission

    2006

  • Magnetic field structure and ACR acceleration at the termination shock

    2005

  • Multispacecraft observations of interplanetary shocks: Nonplanarity and energetic particles

    2005

  • How efficient are coronal mass ejections at accelerating solar energetic particles?

    2005

  • The importance of field-line meandering in particle acceleration at shocks

    2005

  • Particle acceleration at shocks moving through an irregular magnetic field

    2005

  • Particle acceleration in the sun and heliosphere

    2005

  • The efficient acceleration of thermal protons by perpendicular shocks

    2005

  • Selected problems in collisionless-shock physics

    2004

  • Magnetic footpoint diffusion at the Sun and its relation to the heliospheric magnetic field

    2004

  • Large-scale hybrid simulations of particle acceleration at a parallel shock

    2004

  • Transverse streaming anisotropies of charged particles accelerated at the solar wind termination shock

    2004

  • Radial streaming anisotropies of charged particles accelerated at the solar wind termination shock

    2004

  • Ulysses observations of solar energetic particles from the 14 July 2000 event at high heliographic latitudes

    2003

  • The physics of particle acceleration by collisionless shocks

    2003

  • The heliospheric magnetic field probed with fast charged particles

    2002

  • Particle acceleration in solar wind compression regions

    2002

  • The latitudinal transport of energetic particles associated with corotating interaction regions

    2001

  • The transport of energetic particles and cosmic rays in the heliosphere

    2001

  • The Injection Problem

    2001

  • Interplanetary magnetic field line mixing deduced from impulsive solar flare particles

    2000

  • Cross-field diffusion of charged particles and the problem of ion injection and acceleration at quasi-perpendicular shocks

    2000

  • Small-scale gradients and large-scale diffusion of charged particles in the heliospheric magnetic field

    2000

  • Three-dimensional numerical simulations of particle injection and acceleration at quasi-perpendicular shocks

    2000

  • The transport of cosmic rays across a turbulent magnetic field

    1999

  • Particle transport and acceleration at corotating interaction regions

    1999

  • The theory of anomalous cosmic rays

    1998

  • Cosmic-ray transport coefficients

    1998

  • Injection and acceleration of thermal protons at quasi-parallel shocks: A hybrid simulation parameter survey

    1997

  • Preacceleration of anomalous cosmic rays in the inner heliosphere

    1997

  • Spatial variation of accelerated pickup ions at co-rotating interaction regions

    1997

  • The acceleration of pickup ions

    1996

  • Simulations of pickup-ion acceleration at quasi-perpendicular shocks

    1995

  • Charged-particle motion in multidimensional magnetic-field turbulence

    1994

  • Cross-field diffusion of ions in one- and two-dimensional hybrid simulations of collisionless shocks

    1994

  • Ion injection and acceleration at parallel shocks: Comparisons of self-consistent plasma simulations with existing theories

    1993

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