Results 181 to 190 of about 1,247 (219)
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Turbulence and Scintillations in the Interplanetary Plasma
Annual Review of Astronomy and Astrophysics, 1973The properties of the broadband fluctuations of the interplanetary plasma are discussed, taking into account observations in the vicinity of 1 AU heliocentric radius on space probes. Aspects of interplanetary scintillations and angular broadening as a probe of the solar wind are considered, giving attention to the 'thin-screen' approximation, a three ...
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Turbulence properties associated with interplanetary shock waves
AIP Conference Proceedings, 2012We calculate the power spectral densities of magnetic field fluctuations associated with interplanetary shock waves, utilizing in-situ magnetic field measurements from spacecraft ACE and Wind at 1AU. We derive related quantities both upstream and downstream of a shock as a function of time/distance away from the shock passage.
Qiang Hu, G P Zank
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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&#8217;s magnetosphere.
Alexander Pitna +2 more
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Interplanetary plasma irregularities and ion acoustic turbulence
Physics Reports, 1990Abstract In this paper we discuss an effect of the ion acoustic turbulence on the inhomogeneous stucture of complementary ionized interplanetary and interstellar plasmas. These media are practically collisionless and their irregularities are of scales (along the magnetic field lines) much smaller than the mean free path of the electrons. However, the
L.G. Genkin, L.M. Erukhimov
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Scintillation, density and turbulence in the interplanetary medium
Planetary and Space Science, 1990Abstract 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
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On the origin of turbulent fields in interplanetary plasmas
AIP Conference Proceedings, 2008Solar 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 +3 more
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Correlation lengths, the Ultrascale, and the spatial structure of interplanetary turbulence
AIP Conference Proceedings, 1999Characteristic 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 ...
W H Matthaeus +2 more
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Turbulence in the Interplanetary Medium: Can Discrete Modes Co-Exist With Turbulence?
AIP Conference Proceedings, 2011Spacecraft 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 +8 more
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On the Transmission of Turbulence Across Interplanetary Shocks: Observations and Theory
2023Collisionless 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 +6 more
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Nonlocal plasma turbulence associated with interplanetary shocks
Journal of Geophysical Research: Space Physics, 1982The 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 +4 more
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