Results 141 to 150 of about 740 (176)

Correlation lengths, the Ultrascale, and the spatial structure of interplanetary turbulence

AIP Conference Proceedings, 1999
Characteristic length scales can be employed to describe the large scale structural and statistical features of solar wind plasma turbulence. At least two outer scales of interplanetary turbulence, the correlation scale and an independent quantity that has been called the “Ultra scale,” have application in the theory of field line random walk and ...
William H Matthaeus, Smith C W, Matthaeus W H   +2 more
exaly   +2 more sources

On the origin of turbulent fields in interplanetary plasmas

AIP Conference Proceedings, 2008
Solar coronal mass ejections are prominent example of interpenetrating particle streams with different properties: densities, speeds, temperature and composition. Such counterstreaming plasmas are quickly unstable leading to the excitation of the electrostatic and electromagnetic instabilities.
M. Lazar, Vasile Mioc, Cristiana Dumitrache, Nedelia A. Popescu   +3 more
openaire   +1 more source

Scintillation, density and turbulence in the interplanetary medium

Planetary and Space Science, 1990
Abstract An attempt is made to reconcile the different power laws obtained when relating, on the one hand, interplanetary scintillation (IPS) to solar-wind density and, on the other, density turbulence to density. A numerical experiment was performed using a 2-D magnetohydrodynamical (MHD) model to simulate the solar wind in the ecliptic plane and ...
S.J. Tappin, Z.K. Smith, M. Dryer
openaire   +1 more source

On the interaction of interplanetary shocks and solar wind turbulence

2021
<p>The propagation of collisionless shocks through the turbulent magnetized plasmas has been investigated for decades. The processes connected with the formation and propagation of Interplanetary (IP) shocks play a key role in the acceleration of particles and in the coupling to the Earth’s magnetosphere.
Alexander Pitna, Jana Šafránková, Zdeněk Němeček   +2 more
openaire   +1 more source

Turbulence in the Interplanetary Medium: Can Discrete Modes Co-Exist With Turbulence?

AIP Conference Proceedings, 2011
Spacecraft observations during the last decade suggest the presence of discrete frequency wave‐like signals embedded in turbulent solar wind fluctuations. A basic plasma physics question immediately arises how a single monochromatic wave mode can survive in the presence of magnetofluid turbulence.
S. Ghosh, D. J. Thomson, W. H. Matthaeus, L. J. Lanzerotti, Dimitris Vassiliadis, Shing F. Fung, Xi Shao, Ioannis A. Daglis, Joseph D. Huba   +8 more
openaire   +1 more source

On the Transmission of Turbulence Across Interplanetary Shocks: Observations and Theory

2023
Collisionless magnetohydrodynamic shocks are ubiquitous in solar wind and in other space plasmas. They serve as natural sites where charged particles can be accelerated to supra-thermal energies via various Fermi acceleration mechanisms. Upstream and downstream fluctuations play a key role in these processes because they can act as scatter centers ...
Alexander Pitna, Gary Zank, Masaru Nakanotani, Lingling Zhao, Laxman Adhikari, Jana Šafránková, Zdeněk Němeček   +6 more
openaire   +1 more source

Nonlocal plasma turbulence associated with interplanetary shocks

Journal of Geophysical Research: Space Physics, 1982
The plasma wave instrument on ISEE 3 has detected regions of plasma turbulence that extend several tenths of an astronomical unit upstream or downstream of inteplanetary shocks. The plasma waves fall into four categories. Highly impulsive 1‐ 10‐kHz electric field bursts were found hours upstream of quasi‐parallel interplanetary shocks.
C. F. Kennel, F. L. Scarf, F. V. Coroniti, E. J. Smith, D. A. Gurnett   +4 more
openaire   +1 more source

Dissipation of interplanetary turbulence by pick-up ions

Advances in Space Research, 1997
Abstract The interaction of MHD waves with pick-up ions in the outer heliosphere is considered. The transport equation for wave energy density describes non-linear wave interaction and wave dissipation due to the resonant interaction with pick-up ions.
V.S. Ptuskin, S.I. Rogovaya, V.N. Zirakashvili, J.A. Le Roux   +3 more
openaire   +1 more source

Magnetic field strength distribution in interplanetary turbulence

Journal of Geophysical Research: Space Physics, 2000
The distribution of magnetic field magnitudes is derived for the special case of a constant mean field and uncorrelated components having Gaussian distributions. Of the three cases considered (isotropic, transverse, and axisymmetric) the latter most closely resembles a lognormal distribution when the parallel variance is less than the perpendicular ...
T. Hartlep, W. H. Matthaeus, N. S. Padhye, C. W. Smith   +3 more
openaire   +1 more source

Turbulent cascade of incompressible unidirectional Alfvén waves in the interplanetary medium

Physical Review Letters, 1989
The large-scale inhomogeneity of the solar wind is taken into account to estimate the turbulent flux due to nonlinear interactions among purely outward-traveling waves. The nonlinear interactions are mediated by secondary, incoming waves generated by the linear coupling of the dominant species to the large-scale gradients.
, Velli, , Grappin, , Mangeney
openaire   +2 more sources