Magneto-seismological insights into the penumbral chromosphere and evidence for wave damping in spicules

  title={Magneto-seismological insights into the penumbral chromosphere and evidence for wave damping in spicules},
  author={Richard J. Morton},
  journal={Astronomy and Astrophysics},
  • R. Morton
  • Published 13 May 2014
  • Physics
  • Astronomy and Astrophysics
Aims: The observation of propagating magneto-hydrodynamic kink waves in magnetic structures and measurement of their properties (amplitude, phase speed) can be used to diagnose the plasma conditions in the neighbourhood of the magnetic structure via magneto-seismology. We aim to reveal properties of the chromosphere/transition region above the sunspot penumbra using this technique. Methods: Hinode SOT observed a sunspot as it was crossing over the limb, providing a unique side on view of the… 

Figures from this paper

Transverse motions in sunspot super-penumbral fibrils
Using high-resolution Ca II 8542 Å observations from the Swedish Solar Telescope, it is provided the first demonstration that the chromospheric super-penumbral fibrils, which span out from the sunspot, also show ubiquitous transverse motions.
MHD Wave Modes Resolved in Fine‐Scale Chromospheric Magnetic Structures
Within the last decade, due to significant improvements in the spatial and temporal resolution of chromospheric data, magnetohydrodynamic (MHD) wave studies in this fascinating region of the Sun's
Using Transverse Waves to Probe the Plasma Conditions at the Base of the Solar Wind
It has long been suggested that magnetohydrodynamic (MHD) waves may supply a significant proportion of the energy required to heat the corona and accelerate the solar wind. Depending on the
Dynamic wave-modes in solar chromospheric structures
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
Dynamics of internetwork chromospheric fibrils: Basic properties and MHD kink waves
Using the spectroscopic imaging capabilities of the Swedish Solar Telescope, we aim to provide the first investigation on the nature and dynamics of elongated absorption features (fibrils) observed
Overdamped Alfven waves due to ion-neutral collisions in the solar chromosphere
Alfvenic waves are ubiquitous in the solar atmosphere and their dissipation may play an important role in atmospheric heating. In the partially ionized solar chromosphere, collisions between ions and
Possible Evolution of Minifilament-Eruption-Produced Solar Coronal Jets, Jetlets, and Spicules, into Magnetic-Twist-Wave “Switchbacks” Observed by the Parker Solar Probe (PSP)
Many solar coronal jets result from erupting miniature-filament (“minifilament”) magnetic flux ropes that reconnect with encountered surrounding far-reaching field. Many of those minifilament flux
Wave heating of the solar atmosphere
  • I. Arregui
  • Physics
    Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
  • 2015
The discussion starts with a selection of observational discoveries that have brought magnetic waves to the forefront of the coronal heating discussion and a commentary on how the combination of theory and observations should help to understand and quantify magnetic wave heating of the solar atmosphere.
An overall view of temperature oscillations in the solar chromosphere with ALMA
An overview of the brightness-temperature fluctuations from several high-quality and high-temporal-resolution time series of images obtained during the first 2 years of solar observations with ALMA, which finds that the observed frequencies significantly vary from one dataset to another.
Investigating Alfvénic wave propagation in coronal open-field regions
It is demonstrated that counter-propagating Alfvénic waves exist in open coronal magnetic fields and key observational insights are revealed into the details of their generation, reflection in the upper atmosphere and outward propagation into the solar wind.


The kink wave, which has often been observed in coronal loops, is considered as a possibly important energy source contributing to coronal heating. However, its generation has not yet been observed.
Torsional Alfvén waves: magneto-seismology in static and dynamic coronal plasmas
Aims. We study the properties of torsional Alfven waves in coronal loops so that they may be exploited for coronal seismological applications. Methods. The governing equation is obtained for standing
A thin dark thread is observed in a UV/EUV solar jet in the 171 Å, 193 Å, and 211 Å, and partially in 304 Å. The dark thread appears to originate in the chromosphere but its temperature does not
Characteristics of transverse waves in chromospheric mottles
Using data obtained by the high temporal and spatial resolution Rapid Oscillations in the Solar Atmosphere instrument on the Dunn Solar Telescope, we investigate at an unprecedented level of detail
Present and Future Observing Trends in Atmospheric Magnetoseismology
Abstract With modern imaging and spectral instruments observing in the visible, EUV, X-ray, and radio wavelengths, the detection of oscillations in the solar outer atmosphere has become a routine
Observations of ubiquitous compressive waves in the Sun's chromosphere.
The observed ubiquity and estimated energy flux associated with the detected magnetohydrodynamic waves suggest the chromosphere is a vast reservoir of wave energy with the potential to meet chromospheric and coronal heating requirements.
Transverse oscillations in chromospheric mottles
A number of recent investigations have revealed that transverse waves are ubiquitous in the solar chromosphere. The vast majority of these have been reported in limb spicules and active region
Observing the excitation mechanisms of incompressible transverse waves is vital for determining how energy propagates through the lower solar atmosphere. We aim to show the connection between
Active region seismology
Active region seismology is concerned with the determination and interpretation of the interaction of the solar acoustic oscillations with near-surface target structures, such as magnetic flux
Propagating Waves Along Spicules
Alfvénic waves are thought to play an important role in coronal heating and acceleration of solar wind. Here we investigate the statistical properties of Alfvénic waves along spicules (jets that