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Parker Solar Probe Observations of High Plasma Beta Solar Wind from Streamer Belt
Jia Huang, J. C. Kasper, Davin E. Larson +23
In general, slow solar wind from the streamer belt forms a high plasma beta equatorial plasma sheet around the heliospheric current sheet (HCS) crossing, namely the heliospheric pl…
The Structure and Origin of Switchbacks: Parker Solar Probe Observations
Jia Huang, J. C. Kasper, L. A. Fisk +25
Switchbacks are rapid magnetic field reversals that last from seconds to hours. Current Parker Solar Probe (PSP) observations pose many open questions in regard to the nature of sw…
The essential role of multi-point measurements in investigations of turbulence, three-dimensional structure, and dynamics: the solar wind beyond single scale and the Taylor Hypothesis
W. H. Matthaeus, S. Adhikari, R. Bandyopadhyay +49
Space plasmas are three-dimensional dynamic entities. Except under very special circumstances, their structure in space and their behavior in time are not related in any simple way…
Magnetic Field Reconstruction for a Realistic Multi-Point, Multi-Scale Spacecraft Observatory
Theodore Broeren, Kristopher Klein, Jason TenBarge +3
Future in situ space plasma investigations will likely involve spatially distributed observatories comprised of multiple spacecraft, beyond the four and five spacecraft configurati…
A powerful machine learning technique to extract proton core, beam and alpha-particle parameters from velocity distribution functions in space plasmas
Daniel Vech, Michael L. Stevens, Kristoff W. Paulson +4
Context: The analysis of the thermal part of velocity distribution functions (VDF) is fundamentally important for understanding the kinetic physics that governs the evolution and d…
Wave-particle energy transfer directly observed in an ion cyclotron wave
Daniel Vech, Mihailo M. Martinovic, Kristopher G. Klein +21
Context. The first studies with Parker Solar Probe (PSP) data have made significant progress toward the understanding of the fundamental properties of ion cyclotron waves in the in…
Proton Core Behaviour Inside Magnetic Field Switchbacks
Thomas Woolley, Lorenzo Matteini, Timothy S. Horbury +10
During Parker Solar Probe's first two orbits there are widespread observations of rapid magnetic field reversals known as switchbacks. These switchbacks are extensively found in th…
Small-scale Magnetic Flux Ropes in the First two Parker Solar Probe Encounters
Yu Chen, Qiang Hu, Lingling Zhao +15
Small-scale magnetic flux ropes (SFRs) are a type of structures in the solar wind that possess helical magnetic field lines. In a recent report (Chen & Hu 2020), we presented the r…
Dependence of kinetic plasma waves on ion-to-electron mass ratio and light-to-Alfvén speed ratio
Daniel Verscharen, Tulasi N. Parashar, S. Peter Gary +1
The magnetization is an important parameter in plasma astrophysics, where and are the electron gyro-frequency and…
Kinetic Scale Spectral Features of Cross Helicity and Residual Energy in the Inner Heliosphere
Daniel Vech, Justin C. Kasper, Kristopher G. Klein +17
In this Paper, we present the first results from the Flux Angle operation mode of the Faraday Cup instrument onboard Parker Solar Probe. The Flux Angle mode allows rapid measuremen…
Magnetic field kinks and folds in the solar wind
Anna Tenerani, Marco Velli, Lorenzo Matteini +18
Parker Solar Probe (PSP) observations during its first encounter at 35.7 have shown the presence of magnetic field lines which are strongly perturbed to the point that th…
Turbulence Transport Modeling and First Orbit Parker Solar Probe (PSP) Observations
Laxman Adhikari, Gary P. Zank, Lingling Zhao +8
Parker Solar Probe (PSP) achieved its first orbit perihelion on November 6, 2018, reaching a heliocentric distance of about 0.165 au (35.55 R). Here, we study the evolution…
Identification of Magnetic Flux Ropes from Parker Solar Probe Observations during the First Encounter
L. -L. Zhao, G. P. Zank, L. Adhikari +17
The Parker Solar Probe (PSP) observed an interplanetary coronal mass ejection (ICME) event during its first orbit around the sun, among many other events. This event is analyzed by…
Proton Temperature Anisotropy Variations in Inner Heliosphere Estimated with First Parker Solar Probe Observations
Jia Huang, Justin C. Kasper, Daniel Vech +27
We report proton temperature anisotropy variations in the inner heliosphere with Parker Solar Probe (PSP) observations. Using a linear fitting method, we derive proton temperature…
A Case for Electron-Astrophysics
Daniel Verscharen, Robert T. Wicks, Olga Alexandrova +27
A grand-challenge problem at the forefront of physics is to understand how energy is transported and transformed in plasmas. This fundamental research priority encapsulates the con…
Strong Preferential Ion Heating is Limited to within the Solar Alfven Surface
Justin C Kasper, Kristopher G Klein
The decay of the solar wind helium to hydrogen temperature ratio due to Coulomb thermalization can be used to measure how far from the Sun strong preferential ion heating occurs. P…
Radial evolution of stochastic heating in low- solar wind
Mihailo M. Martinović, Kristopher G. Klein, Sofiane Bourouaine
We consider the radial evolution of perpendicular ion heating due to the violation of magnetic moment conservation caused by Alfven and kinetic Alfven wave turbulence. This process…
[Plasma 2020 Decadal] The essential role of multi-point measurements in turbulence investigations: the solar wind beyond single scale and beyond the Taylor Hypothesis
W. H. Matthaeus, R. Bandyopadhyay, M. R. Brown +46
This paper briefly reviews a number of fundamental measurements that need to be made in order to characterize turbulence in space plasmas such as the solar wind. It has long been k…
[Plasma 2020 Decadal] Disentangling the Spatiotemporal Structure of Turbulence Using Multi-Spacecraft Data
J. M. TenBarge, O. Alexandrova, S. Boldyrev +26
This white paper submitted for 2020 Decadal Assessment of Plasma Science concerns the importance of multi-spacecraft missions to address fundamental questions concerning plasma tur…
Evidence for Electron Landau Damping in Space Plasma Turbulence
C. H. K. Chen, K. G. Klein, G. G. Howes
How turbulent energy is dissipated in weakly collisional space and astrophysical plasmas is a major open question. Here, we present the application of a field-particle correlation…
Predictions for the First Parker Solar Probe Encounter
B. van der Holst, W. B. Manchester, K. G. Klein +1
We examine Alfvén Wave Solar atmosphere Model (AWSoM) predictions of the first Parker Solar Probe (PSP) encounter. We focus on the 12-day closest approach centered on the 1st perih…
The multi-scale nature of the solar wind
Daniel Verscharen, Kristopher G. Klein, Bennett A. Maruca
The solar wind is a magnetized plasma and as such exhibits collective plasma behavior associated with its characteristic spatial and temporal scales. The characteristic length scal…
Large-scale Control of Kinetic Dissipation in the Solar Wind
Daniel Vech, Kristopher G. Klein, Justin C. Kasper
In this Letter we study the connection between the large-scale dynamics of the turbulence cascade and particle heating on kinetic scales. We find that the inertial range turbulence…
A Majority of Solar Wind Intervals Support Ion-Driven Instabilities
K. G. Klein, B. A. Alterman, M. L. Stevens +2
We perform a statistical assessment of solar wind stability at 1 AU against ion sources of free energy using Nyquist's instability criterion. In contrast to typically employed thre…