Magnetic field in atypical prominence structures: Bubble, tornado and eruption

Abstract

Spectropolarimetric observations of prominences have been obtained with the THEMIS telescope during four years of coordinated campaigns. Our aim is now to understand the conditions of the cool plasma and magnetism in `atypical' prominences, namely when the measured inclination of the magnetic field departs, to some extent, from the predominantly horizontal field found in `typical' prominences. What is the role of the magnetic field in these prominence types? Are plasma dynamics more important in these cases than the magnetic support? We focus our study on three types of `atypical' prominences (tornadoes, bubbles and jet-like prominence eruptions) that have all been observed by THEMIS in the He I D_3 line, from which the Stokes parameters can be derived. The magnetic field strength, inclination and azimuth in each pixel are obtained by using the Principal Component Analysis inversion method on a model of single scattering in the presence of the Hanle effect. The magnetic field in tornadoes is found to be more or less horizontal, whereas for the eruptive prominence it is mostly vertical. We estimate a tendency towards higher values of magnetic field strength inside the bubbles than outside in the surrounding prominence. In all of the models in our database, only one magnetic field orientation is considered for each pixel. While sufficient for most of the main prominence body, this assumption appears to be oversimplified in atypical prominence structures. We should consider these observations as the result of superposition of multiple magnetic fields, possibly even with a turbulent field component.

13 pages, 9 figures

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• Multi-line Stokes inversion for prominence magnetic-field diagnostics
• First High-resolution Spectroscopic Observations of an Erupting Prominence Within a Coronal Mass Ejection by the Interface Region Imaging Spectrograph (IRIS)

Cited by in corpus (24)

• Origin and Structures of Solar Eruptions I: Magnetic Flux Rope (Invited Review)
• Critical Science Plan for the Daniel K. Inouye Solar Telescope (DKIST)
• Magnetic Flux Ropes in the Solar Corona: Structure and Evolution toward Eruption
• Quiescent prominence dynamics observed with the Hinode Solar Optical Telescope . II. Prominence Bubble Boundary Layer Characteristics and the Onset of a Coupled Kelvin-Helmholtz Rayleigh-Taylor Instability
• Observations of the Kelvin-Helmholtz instability driven by dynamic motions in a solar prominence
• Reconstruction of a helical prominence in 3D from IRIS spectra and images
• Halpha Doppler shifts in a tornado in the solar corona
• 1.5D NLTE spectral synthesis of a 3D filament/prominence simulation
• Two Solar Tornadoes Observed with the Interface Region Imaging Spectrograph
• Comparing UV/EUV line parameters and magnetic field in a quiescent prominence with tornadoes
• Interaction of solar jets with filaments: Triggering of large-amplitude filament oscillations
• Large-Scale Vortex Motion and Multiple Plasmoid Ejection Due to Twisting Prominence Threads and Associated Reconnection
• Reconstructing 3D Magnetic Topology of On-disk Prominence Bubbles from Stereoscopic Observations
• Mass motion in a prominence bubble revealing a kinked flux rope configuration
• Association between Tornadoes and Instability of Hosting Prominence
• Exploration of long-period oscillations in an H$\alpha$ prominence
• Simulating Rayleigh-Taylor induced magnetohydrodynamic turbulence in prominences
• Magnetic field vector ambiguity resolution in a quiescent prominence observed on two consecutive days
• Modelling the magnetic structure of a large-scale horse-shoe-like filament in a decaying and diffuse active region
• 24 synoptic maps of average magnetic field in 296 prominences measured by the Hanle effect during the ascending phase of solar cycle 21
• Spectral Characteristics of the He I D3 Line in a Quiescent Prominence Observed by THEMIS
• A new view of the solar interface region from the Interface Region Imaging Spectrograph (IRIS)
• Reminiscences
• Analysis of the Evolution of a Multi-Ribbon Flare and Failed Filament Eruption