Sausage, kink, and fluting MHD wave modes identified in solar magnetic pores by Solar Orbiter/PHI

Abstract

Solar pores are intense concentrations of magnetic flux that emerge through the Sun's photosphere. When compared to sunspots, they are much smaller in diameter and hence can be impacted and buffeted by neighbouring granular activity to generate significant magnetohydrodynamic (MHD) wave energy flux within their confines. However, observations of solar pores from ground-based telescope facilities may struggle to capture subtle motions synonymous with higher-order MHD wave signatures due to seeing effects produced in the Earth's atmosphere. Hence, we have exploited timely seeing-free and high-quality observations of four small magnetic pores from the Polarimetric and Helioseismic Imager (PHI) on board the Solar Orbiter spacecraft. Through acquisition of data under stable observing conditions, we have been able to measure the area fluctuations and horizontal displacements of the solar pores. Cross correlations between perturbations in intensity, area, line-of-sight velocity, and magnetic fields, coupled with the first-time application of novel Proper Orthogonal Decomposition (POD) techniques on the boundary oscillations, provide a comprehensive diagnosis of the embedded MHD waves as sausage and kink modes. Additionally, the previously elusive m = 2 fluting mode is identified in the most magnetically isolated of the four pores. An important consideration lies in how the identified wave modes contribute towards the transfer of energy into the upper solar atmosphere. We find that the four pores examined have approximately 56%, 72%, 52%, and 34% of their total wave energy associated with the identified sausage modes, and around 23%, 17%, 39%, and 49% to their kink modes, respectively, while the first pore also has around an 11% contribution linked to the fluting mode. This study marks the first-time identification of concurrent sausage, kink, and fluting MHD wave modes in solar magnetic pores.

arXiv commentAccepted for publication in Astronomy & Astrophysics

References in corpus (43)

• The Solar Orbiter mission -- Science overview
• Sunrise: instrument, mission, data and first results
• The Imaging Magnetograph eXperiment (IMaX) for the Sunrise balloon-borne solar observatory
• The Polarimetric and Helioseismic Imager on Solar Orbiter
• Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results
• Observations of ubiquitous compressive waves in the Sun's chromosphere
• The second flight of the SUNRISE balloon-borne solar observatory: overview of instrument updates, the flight, the data and first results
• Properties of Magneto-Hydrodynamic Waves in the Solar Photosphere with Hinode
• MHD Sausage Mode Oscillations in Coronal Loops
• The Solar Orbiter Science Activity Plan: translating solar and heliospheric physics questions into action
• Evidence for the photospheric excitation of incompressible chromospheric waves
• Observations of sausage modes in magnetic pores
• Photospheric observations of surface and body modes in solar magnetic pores
• The usefulness of analytic response functions
• Magnetohydrodynamic Fast Sausage Waves in the Solar Corona
• Waves in the lower solar atmosphere: the dawn of next-generation solar telescopes
• The Origin of Type I Spicule Oscillations
• MHD wave transmission in the Sun's atmosphere
• Transverse Oscillations in Slender Ca II H Fibrils Observed with Sunrise/SuFI
• Excitation of acoustic waves by vortices in the quiet Sun
• High-frequency Oscillations in Small Magnetic Elements Observed with Sunrise/SuFI
• An Inside Look at Sunspot Oscillations with Higher Azimuthal Wavenumbers
• On the properties of slow mhd sausage waves within small-scale photospheric magnetic structures
• First direct observation of a torsional Alfvén oscillation at coronal heights
• Non-linear propagation of kink waves to the solar chromosphere
• On standing sausage waves in photospheric magnetic waveguides
• High Frequency Waves in Chromospheric Spicules
• Magnetohydrodynamic Non-linearities in Sunspot Atmospheres: Chromospheric Detections of Intermediate Shocks
• Oscillations on width and intensity of slender Ca II H fibrils from Sunrise/SuFI
• Propagating Spectropolarimetric Disturbances in a Large Sunspot
• The Propagation of Coherent Waves Across Multiple Solar Magnetic Pores
• A novel approach to identify resonant MHD wave modes in solar pores and sunspot umbrae: $B-\omega$ analysis
• Magnetohydrodynamic wave mode identification in circular and elliptical sunspot umbrae: evidence for high order modes
• Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances
• Kinematics of Magnetic Bright Features in the Solar Photosphere
• Finding the mechanism of wave energy flux damping in solar pores using numerical simulations
• Possible Signature of Sausage Waves in Photospheric Bright Points
• Five-minute oscillation power within magnetic elements in the solar atmosphere
• Varying Driver Velocity Fields in Photospheric MHD Wave Simulations
• Spectropolarimetric investigation of magnetohydrodynamic wave modes in the photosphere: First results from PHI on board Solar Orbiter
• Problems in Observation and Identification of Torsional Waves in the Lower Solar Atmosphere
• On the nature of transverse coronal waves revealed by wavefront dislocations
• The Sun at millimeter wavelengths IV. Magnetohydrodynamic waves in small-scale bright features

Cited by in corpus (3)

• Magnetic properties of orphan penumbrae
• The Sun at millimeter wavelengths V. Magnetohydrodynamic waves in a fibrillar structure
• Multi-height Identification of Sausage and Fluting Eigenmodes in a Solar Pore