Alfvén Waves in the Lower Solar Atmosphere
@article{Jess2009AlfvenWI, title={Alfvén Waves in the Lower Solar Atmosphere}, author={David B. Jess and Mihalis Mathioudakis and R{\'o}bert Erd{\'e}lyi and P. J. Crockett and Francis P. Keenan and Damian J. Christian}, journal={Science}, year={2009}, volume={323}, pages={1582 - 1585} }
The flow of energy through the solar atmosphere and the heating of the Sun's outer regions are still not understood. Here, we report the detection of oscillatory phenomena associated with a large bright-point group that is 430,000 square kilometers in area and located near the solar disk center. Wavelet analysis reveals full-width half-maximum oscillations with periodicities ranging from 126 to 700 seconds originating above the bright point and significance levels exceeding 99%. These…
316 Citations
THE RESPONSE OF A THREE-DIMENSIONAL SOLAR ATMOSPHERE TO WAVE-DRIVEN JETS
- Physics
- 2011
Global oscillations from the solar interior are, mainly, pressure-driven (p-modes) oscillations with a peak power of a five-minute period. These oscillations are considered to manifest in many…
THE SOURCE OF 3 MINUTE MAGNETOACOUSTIC OSCILLATIONS IN CORONAL FANS
- Physics
- 2012
We use images of high spatial, spectral, and temporal resolution, obtained using both ground- and space-based instrumentation, to investigate the coupling between wave phenomena observed at numerous…
High-frequency torsional Alfvén waves as an energy source for coronal heating
- PhysicsScientific reports
- 2017
It is found that oscillating tubes serve as substantial sources of Alfvén wave generation that provide sufficient Poynting flux not only to heat the corona but also to originate the supersonic solar wind.
Dynamic wave-modes in solar chromospheric structures
- Physics
- 2017
Sun’s outer atmosphere is a million degree hotter than it’s visible surface, which is not understood with any of the known laws of thermodynamics and remains an intriguing problem for the…
Alfvén wave dissipation in the solar chromosphere
- Physics
- 2018
Magnetohydrodynamic Alfvén waves1 have been a focus of laboratory plasma physics2 and astrophysics3 for over half a century. Their unique nature makes them ideal energy transporters, and while the…
Torsional oscillations within a magnetic pore in the solar photosphere
- Physics, Environmental Science
- 2021
Alfven waves have proven to be important in a range of physical systems due to their ability to transport non-thermal energy over long distances in a magnetized plasma. This property is of specific…
Spectroscopic Detection of Alfvénic Waves in the Chromosphere of Sunspot Regions
- PhysicsThe Astrophysical Journal Letters
- 2021
Transverse magnetohydrodynamic waves often called Alfvénic (or kink) waves have been often theoretically put forward to solve the outstanding problems of the solar corona like coronal heating, solar…
Alfvén waves as a solar-interplanetary driver of the thermospheric disturbances
- Physics, GeologyScientific reports
- 2016
The observed ability of Alfvén waves to excite large-scale gravity waves, together with their proved ubiquity in the solar atmosphere and solar wind, suggests that Alfven waves could be an important solar-interplanetary driver of the global thermospheric disturbances.
Observations from Hinode/EIS of intensity oscillations above a bright point: signature of the leakage of acoustic oscillations in the inner corona
- Physics
- 2010
We study the intensity oscillations in the upper chromosphere/transition region (TR) and corona, above a bright point (BP) in the solar atmosphere. We analyse the time series of He ii 256 A, Fe xii…
The Origin of Type I Spicule Oscillations
- Physics
- 2012
We use images of high spatial and temporal resolution, obtained with the Rapid Oscillations in the Solar Atmosphere instrument at the Dunn Solar Telescope, to reveal how the generation of transverse…
References
SHOWING 1-10 OF 51 REFERENCES
Alfvén Waves in the Solar Corona
- PhysicsScience
- 2007
An estimate of the energy carried by the waves that are spatially resolved indicates that they are too weak to heat the solar corona; however, unresolved Alfvén waves may carry sufficient energy.
Chromospheric Alfvénic Waves Strong Enough to Power the Solar Wind
- PhysicsScience
- 2007
Estimates of the energy flux carried by these waves and comparisons with advanced radiative magnetohydrodynamic simulations indicate that such Alfvén waves are energetic enough to accelerate the solar wind and possibly to heat the quiet corona.
Alfvén Waves and Turbulence in the Solar Atmosphere and Solar Wind
- Physics, Environmental Science
- 2007
We solve the problem of propagation and dissipation of Alfvénic turbulence in a model solar atmosphere consisting of a static photosphere and chromosphere, transition region, and open corona and…
High-frequency acoustic waves are not sufficient to heat the solar chromosphere
- PhysicsNature
- 2005
The detection of high-frequency waves is reported, and numerical simulations are used to show that the acoustic energy flux of these waves is too low, by a factor of at least ten, to balance the radiative losses in the solar chromosphere.
Torsional Alfvén waves in small scale density threads of the solar corona
- Physics
- 2008
The density structuring of the solar corona is observed at large scales (loops and funnels), but also at small scales (sub-structures of loops and funnels). Coronal loops consist of thin density…
Three-Dimensional MHD Wave Propagation and Conversion to Alfvén Waves near the Solar Surface. I. Direct Numerical Solution
- Physics
- 2008
Abstract
The efficacy of fast – slow MHD mode conversion in the surface layers of sunspots has been demonstrated over recent years using a number of modelling techniques, including ray theory,…
Oscillations in Chromospheric Network Bright Points
- Physics
- 1997
Intensity oscillations observed in the H and K lines of Ca II in network bright points in the quiet Sun are interpreted in terms of transverse and longitudinal magnetoacoustic waves propagating…
Direct excitation of resonant torsional Alfven waves by footpoint motions
- Physics
- 1997
The present paper studies the heating of coronal loops by linear resonant Alfven waves that are excited by the motions of the photospheric footpoints of the magnetic field lines. The analysis is…
Coronal Waves and Oscillations
- PhysicsProceedings of the International Astronomical Union
- 2006
Wave and oscillatory activity of the solar corona is confidently observed with modern imaging and spectral instruments in the visible light, EUV, X-ray and radio bands, and interpreted in terms of…
Fast events and waves in an active region of the Sun observed in H alpha with high spatial resolution
- Physics
- 2008
Context. We study the chromosphere of an active region of the Sun in the Hα line. Aims. The development of new instrumentation and new methods of data analysis allows to scrutinize the dynamics of…