Search Publications
An Anisotropic Density Turbulence Model from the Sun to 1 au Derived from Radio Observations
Kontar, Eduard P.; Chen, Xingyao; Chrysaphi, Nicolina +5 more
Solar radio bursts are strongly affected by radio-wave scattering on density inhomogeneities, changing their observed time characteristics, sizes, and positions. The same turbulence causes angular broadening and scintillation of galactic and extragalactic compact radio sources observed through the solar atmosphere. Using large-scale simulations of…
Multipoint Turbulence Analysis with HelioSwarm
Servidio, Sergio; Pecora, Francesco; Primavera, Leonardo +3 more
Exploration of plasma dynamics in space, including turbulence, is entering a new era of multisatellite constellation measurements that will determine fundamental properties with unprecedented precision. Familiar but imprecise approximations will need to be abandoned and replaced with more-advanced approaches. We present a preparatory study of the …
Kinetic Alfvén Waves Excited by Multiple Free Energy Sources in the Magnetotail
Lakhina, G. S.; Singh, S. V.; Barik, K. C.
The generation of kinetic Alfvén waves (KAWs) is investigated through a three-component theoretical model incorporating ion beam and velocity shear as the sources of free energy in a non-Maxwellian κ-distributed plasmas. The model considers Maxwellian distributed background ions, drifting-Maxwellian beam ions, and κ-electrons as its constituent sp…
Non-universality of the Turbulent Spectra at Sub-ion Scales in the Solar Wind: Dispersive Effects versus the Doppler Shift
Sahraoui, Fouad; Huang, Shiyong
Large surveys of the power spectral density of the magnetic fluctuations in the solar wind have reported different slope distributions at MHD, sub-ion and sub-electron scales: the smaller the scale, the broader the distribution. Here, we review briefly some of the most relevant explanations of the broadening of the slopes at sub-ion scales. Then, …
Observation of Turbulent Magnetohydrodynamic Cascade in the Jovian Magnetosheath
McComas, D. J.; Szalay, J. R.; Ebert, R. W. +6 more
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 and the magnetometer investigation instruments on board the Juno spacecraft, in concert with two recent compressible models, to investigate the cascade rate in the magnetohydrodyna…
Multipoint Observations of the Dynamics at an ICME Sheath-Ejecta Boundary
Pulkkinen, Tuija I.; Kilpua, Emilia K. J.; Good, Simon W. +3 more
The radial evolution of interplanetary coronal mass ejections (ICMEs) is dependent on their interaction with the ambient medium, which causes ICME erosion and affects their geoefficiency. Here, an ICME front boundary, which separates the confined ejecta from the mixed, interacted sheath-ejecta plasma upstream, is analyzed in a multipoint study exa…
Magnetohydrodynamic Shocks Revisited: Magnetically Constraining the Upstream Solar Wind Condition
Narita, Yasuhito; Schmid, Daniel
Magnetohydrodynamic (MHD) shocks are commonly found in various space and astrophysical systems. One often encounters the problem that only the magnetic field data are available when studying interplanetary shocks and planetary bow shocks in the solar system, and not the plasma data due to instrumental and/or telemetry limitations. We aim to reveal…