MHD Waves in the coronal holes

Abstract

Coronal holes are the dark patches in the solar corona associated with relatively cool, less dense plasma and unipolar fields. The fast component of the solar wind emanates from these regions. Several observations reveal the presence of magnetohydrodynamic (MHD) waves in coronal holes which are believed to play a key role in the acceleration of fast solar wind. The recent advent of high-resolution instruments had brought us many new insights on the properties of MHD waves in coronal holes which are reviewed in this article. The advances made in the identification of compressive slow MHD waves in both polar and equatorial coronal holes, their possible connection with the recently discovered high- speed quasi-periodic upflows, their dissipation, and the detection of damping in Alfven waves from the spectral line width variation are discussed in particular.

11 pages, 5 figures. Chapter in AGU Monograph (in press), Review article

References in corpus (13)

• Persistent Doppler shift oscillations observed with HINODE/EIS in the solar corona: spectroscopic signatures of Alfvenic waves and recurring upflows
• Frequency-dependent damping in propagating slow magneto-acoustic waves
• Spectroscopic signature of Alfvén waves damping in a polar coronal hole up to 0.4 solar radii
• STEREO Observations of Quasi-Periodically Driven High Velocity Outflows in Polar Plumes
• Propagating intensity disturbances in polar corona as seen from AIA/SDO
• Accelerating waves in polar coronal holes as seen by EIS and SUMER
• Propagating waves in polar coronal holes as seen by SUMER and EIS
• Observations of Dissipation of Slow Magneto-acoustic Waves in a Polar Coronal Hole
• Solar off-limb line widths: Alfven waves, ion-cyclotron waves, and preferential heating
• Three-dimensional MHD modeling of propagating disturbances in fan-like coronal loops
• Spectroscopic Observations of Propagating Disturbances in a Polar Coronal Hole: Evidence of Slow Magneto-acoustic Waves
• On the statistical detection of propagating waves in polar coronal holes
• Network oscillations at the boundary of an equatorial coronal hole

Cited by in corpus (11)

• Quasi-periodic pulsations in solar and stellar flares: an overview of recent results
• MHD Waves in open coronal structures
• Damping of slow magnetoacoustic oscillations by the misbalance between heating and cooling processes in the solar corona
• Seismological constraints on the solar coronal heating function
• Quasiperiodic Energy Release and Jets at the Base of Solar Coronal Plumes
• Mixed properties of slow magnetoacoustic and entropy waves in a plasma with heating/cooling misbalance
• The Bi-directional Moving Structures in a Coronal Bright Point
• Excitation of flare-induced waves in coronal loops and the effects of radiative cooling
• Compressive oscillations in hot coronal loops: Are sloshing oscillations and standing slow waves independent?
• A Statistical Study on The Frequency-Dependent Damping of Slow-mode Waves in Polar Plumes and Interplumes
• High-resolution observations of small-scale activity in coronal hole plumes