424 citations · 4.1k across the 75 of their papers we have counts for
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The Effects of Non-Equilibrium Velocity Distributions on Alfvén Ion-Cyclotron Waves in the Solar Wind
Jada Walters, Kristopher G. Klein, Emily Lichko +3
In this work, we investigate how the complex structure found in solar wind proton velocity distribution functions (VDFs), rather than the commonly assumed two-component bi-Maxwelli…
Ion-Driven Instabilities in the Inner Heliosphere II: Classification and Multi-Dimensional Mapping
Mihailo M. Martinovic, Kristopher G. Klein
Linear theory is a well developed framework for characterizing instabilities in weakly collisional plasmas, such as the solar wind. In the previous instalment of this series, we an…
Quantifying the Energy Budget in the Solar Wind from 13.3-100 Solar Radii
J. S. Halekas, S. D. Bale, M. Berthomier +10
A variety of energy sources, ranging from dynamic processes like magnetic reconnection and waves to quasi-steady terms like the plasma pressure, may contribute to the acceleration…
Estimation of turbulent proton and electron heating rates via Landau damping constrained by Parker Solar Probe observations
Niranjana Shankarappa, Kristopher G. Klein, Mihailo M Martinović
The heating of ions and electrons due to turbulent dissipation plays a crucial role in the thermodynamics of the solar wind and other plasma environments. Using magnetic field and…
Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum
N. E. Raouafi, L. Matteini, J. Squire +54
Launched on 12 Aug. 2018, NASA's Parker Solar Probe had completed 13 of its scheduled 24 orbits around the Sun by Nov. 2022. The mission's primary science goal is to determine the…
Strong perpendicular velocity-space in proton beams observed by Parker Solar Probe
J. L. Verniero, B. D. G. Chandran, D. E. Larson +16
The SWEAP instrument suite on Parker Solar Probe (PSP) has detected numerous proton beams associated with coherent, circularly polarized, ion-scale waves observed by PSP's FIELDS i…
Ion-Driven Instabilities in the Inner Heliosphere I: Statistical Trends
Mihailo M. Martinovic, Kristopher G. Klein, Tereza Durovcova +1
Instabilities described by linear theory characterize an important form of wave-particle interaction in the solar wind. We diagnose unstable behavior of solar wind plasma between 0…
How Alfvén waves energize the solar wind: heat vs work
Jean C. Perez, Benjamin D. G. Chandran, Kristopher G. Klein +1
A growing body of evidence suggests that the solar wind is powered to a large extent by an Alfvén-wave (AW) energy flux. AWs energize the solar wind via two mechanisms: heating and…
Multiscale Solar Wind Turbulence Properties inside and near Switchbacks measured by Parker Solar Probe
Mihailo M. Martinović, Kristopher G. Klein, Jia Huang +9
Parker Solar Probe (PSP) routinely observes magnetic field deflections in the solar wind at distances less than 0.3 au from the Sun. These deflections are related to structures com…
Inferred Linear Stability of Parker Solar Probe Observations using One- and Two-Component Proton Distributions
K. G. Klein, J. L. Verniero, B. Alterman +12
The hot and diffuse nature of the Sun's extended atmosphere allows it to persist in non-equilibrium states for long enough that wave-particle instabilities can arise and modify the…
The Near-Sun Streamer Belt Solar Wind: Turbulence and Solar Wind Acceleration
C. H. K. Chen, B. D. G. Chandran, L. D. Woodham +8
The fourth orbit of Parker Solar Probe (PSP) reached heliocentric distances down to 27.9 Rs, allowing solar wind turbulence and acceleration mechanisms to be studied in situ closer…
Electron heat flux in the near-Sun environment
J. S. Halekas, P. L. Whittlesey, D. E. Larson +15
We survey the electron heat flux observed by the Parker Solar Probe (PSP) in the near-Sun environment at heliocentric distances of 0.125-0.25 AU. We utilized measurements from the…
Detection of small magnetic flux ropes from the third and fourth Parker Solar Probe encounters
L. -L. Zhao, G. P. Zank, Q. Hu +22
We systematically search for magnetic flux rope structures in the solar wind to within the closest distance to the Sun of 0.13 AU, using data from the third and fourth orbits of th…
The Enhancement of Proton Stochastic Heating in the near-Sun Solar Wind
Mihailo M. Martinović, Kristopher G. Klein, Justin C. Kasper +18
Stochastic heating is a non-linear heating mechanism driven by the violation of magnetic moment invariance due to large-amplitude turbulent fluctuations producing diffusion of ions…
Ion Scale Electromagnetic Waves in the Inner Heliosphere
Trevor Bowen, Alfred Mallet, Jia Huang +22
Understanding the physical processes in the solar wind and corona which actively contribute to heating, acceleration, and dissipation is a primary objective of NASA's Parker Solar…
Linear Stability in the Inner Heliosphere: Helios Reëvaluated
Kristopher G. Klein, Mihailo Martinovic, David Stansby +1
Wave-particle instabilities driven by departures from local thermodynamic equilibrium have been conjectured to play a role in governing solar wind dynamics. We calculate the statis…
Evolution of The Proton Velocity Distribution due to Stochastic Heating in the Near-Sun Solar Wind
Kristopher G. Klein, Benjamin D. G. Chandran
We investigate how the proton distribution function evolves when the protons undergo stochastic heating by strong, low-frequency, Alfvén-wave turbulence under the assumption that $…
Energy Dissipation and Landau Damping in Two- and Three-Dimensional Plasma Turbulence
Tak Chu Li, Gregory G. Howes, Kristopher G. Klein +1
Plasma turbulence is ubiquitous in space and astrophysical plasmas, playing an important role in plasma energization, but the physical mechanisms leading to dissipation of the turb…
On the Conservation of Cross Helicity and Wave Action in Solar-Wind Models with Non-WKB Alfven Wave Reflection
Benjamin D. G. Chandran, Jean C. Perez, Daniel Verscharen +2
The interaction between Alfven-wave turbulence and the background solar wind affects the cross helicity in two ways. Non-WKB reflection converts outward-propagating Alfven waves in…
Validity of the Taylor Hypothesis for Linear Kinetic Waves in the Weakly Collisional Solar Wind
G. G. Howes, K. G. Klein, J. M. TenBarge
The interpretation of single-point spacecraft measurements of solar wind turbulence is complicated by the fact that the measurements are made in a frame of reference in relative mo…
The Quasilinear Premise for the Modeling of Plasma Turbulence
Gregory G. Howes, Kristopher G. Klein, Jason M. TenBarge
The quasilinear premise is a hypothesis for the modeling of plasma turbulence in which the turbulent fluctuations are represented by a superposition of randomly-phased linear wave…
The slow-mode nature of compressible wave power in solar wind turbulence
G. G. Howes, S. D. Bale, K. G. Klein +3
We use a large, statistical set of measurements from the Wind spacecraft at 1 AU, and supporting synthetic spacecraft data based on kinetic plasma theory, to show that the compress…