Results 131 to 140 of about 2,729 (231)

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

Wave propagation, phase mixing and dissipation in Hall MHD

, 2012
In this thesis the effect of the Hall term in the generalised Ohm’s law on Alfvén (shear) and fast wave propagation and dissipation in the ion cyclotron frequency range is investigated.
Threlfall, James W.
core  

Solar flux emergence : a three-dimensional numerical study

, 2008
Flux is continually emerging on the Sun, making its way from the solar interior up into the atmosphere. Emergence occurs on small-scales in the quiet Sun where magnetic fragments emerge, interact and cancel and on large-scales in active regions where ...
Murray, Michelle J.
core  

Acceleration of the Fast Solar Wind by Solitary Waves in Coronal Holes

, 2000
The purpose of this investigation is to develop a new model for the acceleration of the fast solar wind by nonlinear, time-dependent multidimensional MHD simulations of waves in solar coronal holes.
Ofman, Leon
core  

Coronal Alfven waves and the solar wind

, 1972
The observed properties of coronal Alfven waves in the solar wind at 1 AU are briefly reviewed, with some theoretical discussion of their probable effects on the dynamics of the expanding solar corona. It is concluded that coronal Alfven waves can have a
Belcher, J. W.
core  

Nonlinearly Wave-Wave Interaction Leads to Solar Coronal Heating

Journal of Condensed Matter
Nonlinear formulation of slow Alfvén wave in magnetized plasma which can be an essential ingredient of the solar space plasma is being studied. Various method has been adopted, mathematical formulation of the magnetohydrodynamic (MHD) waves can interpret the astrophysical phenomena happening in space plasma.
openaire   +1 more source

Test for Alfven Wave Signatures in a Solar Coronal Hole

The Astrophysical Journal, 2003
Using spectral line observations to study minor ion motions in a solar coronal hole, a test was made for the presence of Alfven waves. From this we conclude that the Alfven wave flux into the upper portion of the hole is not significant. The SOHO/SUMER ultraviolet spectrograph was used to observe 22 coronal ions with masses ranging from 14mH to 56mH ...
openaire   +1 more source

Radial evolution of cross helicity in high-latitude solar wind

, 2005
We employ a turbulence transport theory to explain the high-latitude radial evolution of cross helicity, or Alfvénicity, observed by the Ulysses spacecraft.
Matthaeus, William H., Oughton, Sean, Bavassano, B., Minnie, J., Oarhi, S., Bieber, J.W., Breech, Ben   +6 more
core   +1 more source

Observation of Large-scale Kelvin–Helmholtz Instability Wave Driven by a Coronal Mass Ejection

The Astrophysical Journal Letters
The Kelvin–Helmholtz instability (KHI) can occur when there is a relative motion between two adjacent fluids. In the case of magnetized plasma, the shear velocity must exceed the local Alfvén speed for the instability to develop.
Leon Ofman, Olga Khabarova, Ryun-Yong Kwon, Yogesh, Eyal Heifetz, Katariina Nykyri   +5 more
doaj   +1 more source

Generation of Surface Sausage Oscillations of a Current Sheet and Propagating Magnetoacoustic Waves by Impulsive Reconnection

The Astrophysical Journal
Magnetic reconnection and magnetohydrodynamic waves may well be both playing a role in coronal heating. In this paper, we simulate reconnection in the corona as a response to the convergence of opposite-polarity magnetic sources at the base of the corona.
Sripan Mondal, A. K. Srivastava, David I. Pontin, Eric R. Priest   +3 more
doaj   +1 more source