Results 101 to 110 of about 9,065 (177)

Continuum Enhancement and Line Asymmetries of Solar Flares in Different Heating Models: Alfvén Waves, Nonthermal Electron Beams, and Their Joint Effect

The Astrophysical Journal
How the plasma in the atmosphere is heated during a solar flare remains inconclusive. Nonthermal electron beams are usually considered as an essential heating source, yet Alfvén waves have also been proposed as a promising heating mechanism.
Jun Tian, Ying Li, Jie Hong, M. D. Ding
doaj   +1 more source

Heating of coronal loops: weak MHD turbulence and scaling laws

, 2007
To understand the nonlinear dynamics of the Parker scenario for coronal heating, long-time high-resolution simulations of the dynamics of a coronal loop in cartesian geometry are carried out. A loop is modeled as a box extended along the direction of the
Einaudi, G., Rappazzo, A. F., Velli, M.
core   +1 more source

Resonant Absorption as Mode Conversion? II. Temporal Ray Bundle

, 2010
A fast-wave pulse in a simple, cold, inhomogeneous MHD model plasma is constructed by Fourier superposition over frequency of harmonic waves that are singular at their respective Alfven resonances.
Chris S. Hanson, D.H. Bailey, P.S. Cally, Paul S. Cally   +3 more
core   +1 more source

A two-fluid model describing the finite-collisionality, stationary Alfvén wave in anisotropic plasma [PDF]

Nonlinear Processes in Geophysics, 2008
The stationary inertial Alfvén (StIA) wave (Knudsen, 1996) was predicted for cold, collisionless plasma. The model was generalized (Finnegan et al., 2008) to include nonzero values of electron and ion collisional resistivity and thermal pressure.
S. M. Finnegan, M. E. Koepke, D. J. Knudsen   +2 more
doaj  

Dynamics of Slow Solar Wind Emerging from an Equatorial Coronal Hole

The Astrophysical Journal
We present a three-dimensional reduced magnetohydrodynamics model to depict turbulence induced by Alfvén waves within the slow solar wind originating from an open magnetic field positioned in a coronal hole near the solar equator.
M. Asgari-Targhi, K. Fujiki
doaj   +1 more source

Measurement of Energy Reduction of Inertial Alfvén Waves Propagating through Parallel Gradients in the Alfvén Speed

The Astrophysical Journal
We have studied the propagation of inertial Alfvén waves through parallel gradients in the Alfvén speed using the Large Plasma Device at the University of California, Los Angeles. The reflection and transmission of Alfvén waves through inhomogeneities in
Garima Joshi, Sayak Bose, Troy Carter, Daniel Wolf Savin, Shreekrishna Tripathi, Stephen Vincena, Michael Hahn   +6 more
doaj   +1 more source

Assessing the global Alfvén wave power flow into and out of the auroral acceleration region during geomagnetic storms. [PDF]

Sci Adv, 2019
Keiling A, Thaller S, Wygant J, Dombeck J.   +3 more
europepmc   +1 more source

Stochastic proton heating by kinetic-Alfvén-wave turbulence in moderately high-<i>β</i> plasmas. [PDF]

J Plasma Phys, 2018
Hoppock IW, Chandran BDG, Klein KG, Mallet A, Verscharen D.   +4 more
europepmc   +1 more source

Dominance of 2 Minute Oscillations near the Alfvén Surface

The Astrophysical Journal Letters
Alfvén waves, considered one of the primary candidates for heating and accelerating the fast solar wind, are ubiquitous in spacecraft observations, yet their origin remains elusive.
Zesen Huang, Marco Velli, Chen Shi, Yingjie Zhu, B. D. G. Chandran, Trevor Bowen, Victor Réville, Jia Huang, Chuanpeng Hou, Nikos Sioulas, Mingzhe Liu, Marc Pulupa, Sheng Huang, Stuart D. Bale   +13 more
doaj   +1 more source

Observed Fluctuation Enhancement and Departure from WKB Theory in Sub-Alfvénic Solar Wind

The Astrophysical Journal Letters
Using Parker Solar Probe data from orbits 8 through 17, we examine fluctuation amplitudes throughout the critical region where the solar wind flow speed approaches and then exceeds the Alfvén wave speed, taking account of various exigencies of the plasma
David Ruffolo, Panisara Thepthong, Peera Pongkitiwanichakul, Sohom Roy, Francesco Pecora, Riddhi Bandyopadhyay, Rohit Chhiber, Arcadi V. Usmanov, Michael Stevens, Samuel Badman, Orlando Romeo, Jiaming Wang, Joshua Goodwill, Melvyn L. Goldstein, William H. Matthaeus   +14 more
doaj   +1 more source