Pseudoheating of protons in the presence of Alfvénic turbulence

C. B. Wang; C. S. Wu
February 2009
Physics of Plasmas;Feb2009, Vol. 16 Issue 2, pN.PAG
Academic Journal
The possibility of heating of protons via Alfvén waves is a topic that stimulates much discussion in both plasma physics and astrophysics. Conventional thinking is that dissipation is essential for heating. In two recent discussions it is shown that turbulent Alfvén waves can enhance stochastic particle motion via scattering. This process can lead to a higher proton temperature. In this Letter two essential points are stressed: First, there is no dissipation; second, physically the temperature increment is “apparent” rather than genuine, and consequently the heating is spurious. If the turbulent wave field should diminish, the proton temperature returns to its original value. The purpose of this communication is to elucidate and explain the above points.


Related Articles

  • Oscillator strengths and effective collision strengths for electron excitation of Mg VI. Tayal, S. S. // Astronomy & Astrophysics / Astronomie et Astrophysique;Nov2012, Vol. 548, p1 

    Aims. Electron impact excitation collision strengths and oscillator strengths for the astrophysically important lines in Mg VI are reported. Thermally averaged collision strengths are presented as a function of electron temperature for application to solar and other astrophysical plasmas....

  • Shock creation and particle acceleration driven by plasma expansion into a rarefied medium. Sarri, G.; Dieckmann, M. E.; Kourakis, I.; Borghesi, M. // Physics of Plasmas;Aug2010, Vol. 17 Issue 8, p082305 

    The expansion of a dense plasma through a more rarefied ionized medium is a phenomenon of interest in various physics environments ranging from astrophysics to high energy density laser-matter laboratory experiments. Here this situation is modeled via a one-dimensional particle-in-cell...

  • Snowplow-like behavior in the implosion phase of wire array Z pinches. Lebedev, S. V.; Beg, F. N.; Bland, S. N.; Chittenden, J. P.; Dangor, A. E.; Haines, M. G. // Physics of Plasmas;May2002, Vol. 9 Issue 5, p2293 

    The effect of discrete wires on the implosion dynamics of wire array Z-pinch experiments at ∼1 MA current level is discussed. The data show that the formation of a core–corona structure leads to gradual radial redistribution of mass by precursor plasma flow from the stationary wire...

  • Spectroscopic diagnosis of long-scale-length exploding-foil plasma in the presence of an intense radiation field. Shepard, T. D.; Keane, C. J.; Suter, L. J.; Abdallah, J. // Review of Scientific Instruments;Oct92, Vol. 63 Issue 10, p5101 

    An effective technique for measuring the local electron temperature and density of a laser-produced plasma involves analysis of the emission and/or absorption spectrum from an impurity dopant. However, when an intense high-energy radiation field is present the ionization balance, level...

  • Temperature-gradient instability induced by conducting end walls. Berk, H. L.; Ryutov, D. D.; Tsidulko, Yu. A. // Physics of Fluids B: Plasma Physics;Jun91, Vol. 3 Issue 6, p1346 

    A new rapidly growing electron-temperature-gradient instability is found for a plasma in contact with a conducting wall. The linear instability analysis is presented and speculations are given for its nonlinear consequences. This instability illustrates that conducting walls can produce effects...

  • Electron-acoustic solitary structures in two-electron-temperature plasma with superthermal electrons. Chen, H.; Liu, S. // Astrophysics & Space Science;May2012, Vol. 339 Issue 1, p179 

    The propagation of nonlinear electron-acoustic waves (EAWs) in an unmagnetized collisionless plasma system consisting of a cold electron fluid, superthermal hot electrons and stationary ions is investigated. A reductive perturbation method is employed to obtain a modified Korteweg-de Vries...

  • Effects of trapping and finite temperature in a relativistic degenerate plasma. Shah, H. A.; Masood, W.; Qureshi, M. N. S.; Tsintsadze, N. L. // Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p102306 

    In the present work, we have undertaken, for the first time, investigation on the effect of trapping on the formation of solitary structures in relativistic degenerate plasmas. Such plasmas have been observed in dense astrophysical objects, and in laboratory these may result due to the...

  • Analytical criteria for nonlinear instability of thermal structures. Ibanez, Miguel H.; Rosenzweig, Patricia // Physics of Plasmas;Nov95, Vol. 2 Issue 11, p4127 

    Examines the astrophysical criteria for supercritical and asymptotic stability for slab-like, spherical and cylindrical thermal structures. Assumption that the thermal conductivity and the gain/loss function can be written as continuous functions of the temperature; Threshold value for the...

  • Preface to Special Topic: High Energy Density Laboratory Astrophysics: Summaries of Papers Given During a Special Session at the American Physical Society 2008 April Meeting, St. Louis, Missouri. Remington, Bruce A. // Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p040901 

    An introduction to the journal is presented in which the editor discusses several articles which includes "Accretion disk dynamics, photoionized plasmas, and stellar opacities," "Stellar explosions, instabilities, and turbulence," and "The National Ignition Facility: Ushering in a new age for...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics