158 citations · 1.5k across the 55 of their papers we have counts for
55 papers
Proton Heating Rates in the Inner Heliosphere: Helios Observations
Alaa Fayad, Anna Tenerani, Chadi Salem
Solar wind protons exhibit a temperature anisotropy that deviates from the double-adiabatic prediction, suggesting an additional energy source. To investigate solar wind heating me…
Spherically Polarized Alfvén Waves and the Gosling Boost
Yuliang Ding, Marco Velli, Zesen Huang +6
Alfvén waves are thought to play critical roles in solar wind acceleration and plasma heating in the solar corona and inner heliosphere. Parker Solar Probe (PSP) has highlighted th…
Nonlinear Tearing Modes in Current-Vortex Sheets
D. Urbanski, F. L. Waelbroeck, A. Tenerani
The linear and nonlinear development of instabilities and Alfvén resonances in a plane current-vortex sheet is presented here for sheared equilibrium profiles $\boldsymbol{B_{y0}}…
Evolution and Impact of Switchbacks Throughout the Heliosphere
Alfred Mallet, Chen Shi, Anna Tenerani +23
Magnetic switchbacks are large-amplitude fluctuations in the interplanetary magnetic field, and appear frequently in the near-Sun solar wind explored recently by Parker Solar Probe…
Three dimensional, spherically polarized magnetic fields
Anna Tenerani, Marco Velli
Turbulence in the solar wind is characterized by Alfvénic fluctuations that exhibit spherical polarization, a geometric condition resulting in the nearly constant magnitude of the…
Resistive instabilities of current sheets in stratified plasmas with a gravitational field
Faisal Sayed, Anna Tenerani, Richard Fitzpatrick
Magnetic reconnection can develop spontaneously via the tearing instability, often invoked to explain disruptive instabilities in fusion devices, solar flares, the generation of pe…
Generation and Expansion-Driven Growth of Switchbacks in the Outer Solar Corona and Solar Wind
Nikos Sioulas, Marco Velli, Chen Shi +6
We analyze \emph{Parker Solar Probe} and \emph{Solar Orbiter} measurements of magnetic-field reversals (``switchbacks'') across the Alfvén surface (), where is t…
Characterization of compressible fluctuations in solar wind streams dominated by balanced and imbalanced turbulence: Parker Solar Probe, Solar Orbiter and Wind observations
C. A. Gonzalez, C. Gonzalez, A. Tenerani
Characterizing compressible fluctuations in the solar wind is essential for understanding their role in solar wind acceleration and heating, yet their origin and evolution across d…
Evolution of an Alfvén Wave-Driven Proton Beam in the Expanding Solar Wind
J. S. Bianco, A. Tenerani, C. Gonzalez +2
We investigate the self-consistent formation and long-term evolution of proton beams in the expanding solar wind using an ensemble of one-dimensional hybrid expanding box simulatio…
On the Propagation and Damping of Alfvenic Fluctuations in the Outer Solar Corona and Solar Wind
Nikos Sioulas, Marco Velli, Chen Shi +17
We analyze \textit{Parker Solar Probe} and \textit{Solar Orbiter} observations to investigate the propagation and dissipation of Alfvénic fluctuations from the outer corona to 1~AU…
Analytic Model and Magnetohydrodynamic Simulations of Three-dimensional Magnetic Switchbacks
Chen Shi, Marco Velli, Gabor Toth +5
Parker Solar Probe observations reveal that the near-Sun space is almost filled with magnetic switchbacks (``switchbacks'' hereinafter), which may be a major contributor to the hea…
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…
Evolution of MHD turbulence in the expanding solar wind: residual energy and intermittency
Chen Shi, Nikos Sioulas, Zesen Huang +3
We conduct 3D magnetohydrodynamic (MHD) simulations of decaying turbulence in the solar wind context. To account for the spherical expansion of the solar wind, we implement the exp…
Dispersive and kinetic effects on kinked Alfvén wave packets: a comparative study with fluid and hybrid models
Anna Tenerani, Carlos González, Nikos Sioulas +2
We investigate dispersive and kinetic effects on the evolution of a two-dimensional kinked Alfvén wave packet by comparing results from MHD, Hall-MHD and hybrid simulations of a lo…
Particle-in-cell simulations of Alfvén wave parametric decay in a low-beta plasma
C. A Gonzalez, Maria Elena Innocenti, Anna Tenerani
We study the parametric decay instability of parallel propagating Alfvén wave in a low-beta plasma using one-dimensional fully kinetic simulations. We focus for the first time on t…
Proton and electron temperatures in the solar wind and their correlations with the solar wind speed
Chen Shi, Marco Velli, Roberto Lionello +8
The heating and acceleration of the solar wind remains one of the fundamental unsolved problems in heliophysics. It is usually observed that the proton temperature is highly…
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…
Magnetic field spectral evolution in the inner heliosphere
Nikos Sioulas, Zesen Huang, Chen Shi +23
Parker Solar Probe and Solar Orbiter data are used to investigate the radial evolution of magnetic turbulence between au. The spectrum is studied as…
Patches of magnetic switchbacks and their origins
Chen Shi, Olga Panasenco, Marco Velli +18
Parker Solar Probe (PSP) has shown that the solar wind in the inner heliosphere is characterized by the quasi omni-presence of magnetic switchbacks ("switchback" hereinafter), loca…
Direct evidence of magnetic reconnection onset via the tearing instability
Mayur R. Bakrania, I. Jonathan Rae, Andrew P. Walsh +4
Magnetic reconnection is a sporadic process responsible for energy release in space and laboratory plasmas. It is believed that the tearing mode instability may be responsible for…
Influence of the heliospheric current sheet on the evolution of solar wind turbulence
Chen Shi, Marco Velli, Anna Tenerani +2
The effects of the heliospheric current sheet (HCS) on the evolution of Alfvénic turbulence in the solar wind are studied using MHD simulations incorporating the expanding-box-mode…
Generalized Fluid Models of the Braginskii Type
P. Hunana, T. Passot, E. Khomenko +7
Several generalizations of the well-known fluid model of Braginskii (Rev. of Plasma Phys., 1965) are considered. We use the Landau collisional operator and the moment method of Gra…
Stability of the magnetotail current sheet with normal magnetic field and field-aligned plasma flows
Chen Shi, Anton Artemyev, Marco Velli +1
One of the most important problems of magnetotail dynamics is the substorm onset and the related instability of the magneotail current sheet. Since the simplest 2D current sheet co…
Evolution of switchbacks in the inner Heliosphere
Anna Tenerani, Nikos Sioulas, Lorenzo Matteini +3
We analyze magnetic field data from the first six encounters of PSP, three Helios fast streams and two Ulysses south polar passes covering heliocentric distances $0.1\lesssim R\les…