158 citations · 1.2k across the 51 of their papers we have counts for
51 papers
First Observation of a Polar Coronal Hole-like Fast Solar Wind Stream in the Sub-Alfvénic Solar Corona: an Analysis of Turbulence Properties
Riddhi Bandyopadhyay, Sujan Prasad Gautam, William H. Matthaeus +2
Parker Solar Probe, near its 23rd perihelion in March 2025, sampled an extended interval of sub-Alfvénic solar wind likely originating from a large equatorial coronal hole. At heli…
Direct Measurement of Polar Coronal Hole-like Solar Wind in its Acceleration Phase
Samuel T. Badman, Yeimy J. Rivera, Michael L. Stevens +38
The early evolution of fast polar coronal hole (PCH) solar wind remains largely unconstrained by in situ measurements. In March 2025, Parker Solar Probe (Parker) at its closest app…
Collimation of diamagnetic laser-driven plasma outflows by an ambient magnetic-pressure gradient
Yigeng Tian, Chung Hei Leung, Arijit Bose +3
We present magnetohydrodynamic simulations of laser driven plasma outflows propagating along an externally applied poloidal magnetic field, designed to mimic coronal open-field pla…
Conversion Layer Controls the Evolution of Magnetic Deflections Near the Alfven Surface
Dominic Payne, Mojtaba Akhavan-Tafti, Joshua Goodwill +10
We examine the statistics of Alfvenic deflections in both sub-Alfvenic and super-Alfvenic solar wind with particular focus on a common parameter that underlies the definition of sw…
Tracking the Evolution of Plasma Instabilities from the Prominence-Corona Transition Region into Interplanetary Space with Total Solar Eclipse and WISPR/PSP White Light Images
Shadia R. Habbal, Shaheda Begum Shaik, Zachary Bailey +5
High-resolution total solar eclipse (TSE) white light (WL) images are the only observations at present to capture coronal structures over an uninterrupted field of view (FoV) of at…
Characterization of the Trans-Alfvénic Region Using Observations from Parker Solar Probe
Subash Adhikari, Riddhi Bandyopadhyay, Joshua Goodwill +14
Close to Earth the solar wind is usually super-Alfvénic, i.e. the speed of the solar wind is much larger than the Alfvén speed. However, in the lower coronal regions, the solar win…
Estimation of Effective Viscosity to Quantify Collisional Behavior in Collisionless Plasma
Subash Adhikari, Carlos Gonzalez, Yan Yang +4
While dissipation in collisional plasma is defined in terms of viscosity and resistivity, the exact functional form of dissipation i.e., the so-called dissipation function in nearl…
Density fluctuation-Mach number scaling in compressible, high plasma beta turbulence: in-situ space observations and high-Reynolds number simulations
Riddhi Bandyopadhyay, James R. Beattie, Amitava Bhattacharjee
Understanding the nature of compressible fluctuations in a broad range of turbulent plasmas, from the intracluster medium to the solar wind, has been an active field of research in…
Measurement of Turbulence Injection Scale Down to the Chromosphere
Zac Bailey, Riddhi Bandyopadhyay, Shadia Habbal +1
The solar atmosphere displays a sharp temperature gradient, starting from spicules in the chromosphere at K, outward into the corona exceeding K. Plasma turb…
Observed Fluctuation Enhancement and Departure from WKB Theory in Sub-Alfvénic Solar Wind
David Ruffolo, Panisara Thepthong, Peera Pongkitiwanichakul +12
Using Parker Solar Probe data from orbits 8 through 17, we examine fluctuation amplitudes throughout the critical region where the solar wind flow speed approaches and then exceeds…
A detailed survey of the parallel mean free path of solar energetic particle protons and electrons
J. T. Lang, R. D. Strauss, N. E. Engelbrecht +4
In this work, more than a dozen solar energetic particle (SEP) events are identified where the source region is magnetically well-connected to at least one spacecraft at 1~au. The…
Scale and Time Dependence of Alfvénicity in the Solar Wind as Observed by {\it Parker Solar Probe}
Panisara Thepthong, Peera Pongkitiwanichakul, David Ruffolo +4
Alfvénicity is a well-known property, common in the solar wind, characterized by a high correlation between magnetic and velocity fluctuations. Data from the Parker Solar Probe (PS…
Local proton heating at magnetic discontinuities in Alfvenic and non-Alfvenic solar wind
C. A. Gonzalez, J. L. Verniero, R. Bandyopadhyay +1
We investigate the local proton energization at magnetic discontinuities/intermittent structures and the corresponding kinetic signatures in velocity phase space in Alfvénic and no…
Effective Viscosity, Resistivity, and Reynolds Number in Weakly Collisional Plasma Turbulence
Yan Yang, William H. Matthaeus, Sean Oughton +6
We examine dissipation and energy conversion in weakly collisional plasma turbulence, employing in situ observations from the Magnetospheric Multiscale (MMS) mission and kinetic Pa…
Relaxation of the turbulent magnetosheath
Francesco Pecora, Yan Yang, Alexandros Chasapis +9
In turbulence, nonlinear terms drive energy transfer from large-scale eddies into small scales through the so-called energy cascade. Turbulence often relaxes toward states that min…
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…
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…
Strategies for determining the cascade rate in MHD turbulence: isotropy, anisotropy, and spacecraft sampling
Yanwen Wang, Rohit Chhiber, Subash Adhikari +6
``Exact'' laws for evaluating cascade rates, tracing back to the Kolmogorov ``4/5'' law, have been extended to many systems of interest including magnetohydrodynamics (MHD), and co…
Observation of Turbulent Magnetohydrodynamic Cascade in the Jovian Magnetosheath
N. Andrés, R. Bandyopadhyay, D. J. McComas +6
We present the first estimation of the energy cascade rate in Jupiter's magnetosheath (MS). We use in-situ observations from the Jovian Auroral Distributions Experiment (JADE) and…
Association of intermittency with electron heating in the near-Sun solar wind
C. Phillips, R. Bandyopadhyay, D. J. McComas +1
Several studies in the near-Earth environment show that intermittent structures are important sites of energy dissipation and particle energization. Recent Parker Solar Probe (PSP)…
Magnetic field intermittency in the solar wind: PSP and SolO observations ranging from the Alfven region out to 1 AU
Nikos Sioulas, Zesen Huang, Marco Velli +17
and data are utilized to investigate magnetic field intermittency in the solar wind (SW). Small-scale intermittency is observed to radially strengthen…
Taylor microscale and effective Reynolds number near the Sun from PSP
C. Phillips, R. Bandyopadhyay, D. J. McComas
The Taylor microscale is a fundamental length scale in turbulent fluids, representing the end of fluid properties and onset of dissipative processes. The Taylor microscale can also…
Isotropization and Evolution of Energy-Containing Eddies in Solar Wind Turbulence: Parker Solar Probe, Helios 1, ACE, WIND, and Voyager 1
Manuel Enrique Cuesta, Rohit Chhiber, Sohom Roy +6
We examine the radial evolution of correlation lengths perpendicular (\(λ_C^{\perp}\)) and parallel (\(λ_C^{\parallel}\)) to the magnetic-field direction, computed from solar wind…
Magnetic Switchback Occurrence Rates in the Inner Heliosphere: Parker Solar Probe and 1 au
Francesco Pecora, William H. Matthaeus, Leonardo Primavera +4
The subject of switchbacks, defined either as large angular deflections or polarity reversals of the magnetic field, has generated substantial interest in the space physics communi…