A Detailed Comparison Between The Observed and Synthesized Properties of a Simulated Type ii Spicule

Abstract

We performed a 3D radiative MHD simulation of the solar atmosphere. This simulation shows a jet-like feature that shows similarities to the type II spicules observed for the first time with Hinode. Rapid Blueshifted Events (RBEs) on the solar disk are associated with these spicules. Observational results suggest they may contribute significantly in supplying the corona with hot plasma. We perform a detailed comparison of the properties of the simulated jet with those of type II spicules (observed with Hinode) and RBEs (with ground-based instruments). We analyze variety of synthetic emission and absorption lines from the simulations including chromospheric Ca II and Ha to TR and coronal temperatures (10E4 to several 10E6K). We compare their synthetic intensities, line profiles, Doppler shifts, line widths and asymmetries with observations from Hinode/SOT and EIS, SOHO/SUMER, SST and SDO/AIA. Many properties of the synthetic observables resemble the observations, and we describe in detail the physical processes that lead to these observables. Detailed analysis of the synthetic observables provides insight into how observations should be analyzed to derive information about physical variables in such a dynamic event. For example, we find that LOS superposition in the optically thin atmosphere requires the combination of Doppler shifts and spectral line asymmetry to determine the velocity in the jet. Other properties differ from the observations, especially in the chromospheric lines. The mass density of the part of the spicule with a chromospheric temperature is too low to produce significant opacity in chromospheric lines. These and other discrepancies are described in detail, and we discuss which mechanisms and physical processes may need to be included in the MHD simulations to mimic the thermodynamic processes of the chromosphere and corona, in particular to reproduce type II spicules.

57 pages, 23 Figures, Accepted in ApJ

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Cited by in corpus (23)

• On the generation of solar spicules and Alfvénic waves
• An Interface Region Imaging Spectrograph first view on Solar Spicules
• On the prevalence of small-scale twist in the solar chromosphere and transition region
• Two-dimensional Radiative Magnetohydrodynamic Simulations of Partial Ionization in the Chromosphere. II. Dynamics and Energetics of the Low Solar Atmosphere
• A model for straight and helical solar jets: II. Parametric study of the plasma beta
• Transverse Wave Induced Kelvin-Helmholtz Rolls in Spicules
• The First Ionization Potential Effect from the Ponderomotive Force: On the Polarization and Coronal Origin of the Alfven Waves
• Observations and numerical models of solar coronal heating associated with spicules
• Impact of Type II Spicules in the Corona: Simulations and Synthetic Observables
• A Microfilament-Eruption Mechanism for Solar Spicules
• The Role of Partial Ionization Effects in the Chromosphere
• The Coronal Global Evolutionary Model: Using HMI Vector Magnetogram and Doppler Data to Determine Coronal Magnetic Field Evolution
• Time Dependent Non-Equilibrium Ionization of Transition Region Lines Observed with IRIS
• I. Jet Formation and Evolution due to 3D Magnetic Reconnection
• Possible Production of Solar Spicules by Microfilament Eruptions
• The Formation Height of Millimeter-wavelength Emission in the Solar Chromosphere
• Chromospheric Nanoflares as a Source of Coronal Plasma: II. Repeating Nanoflares
• Chromospheric Rapid Blueshifted Excursions Observed with IBIS and Their Association with Photospheric Magnetic Field Evolution
• What Is the Source of Quiet Sun Transition Region Emission?
• High mode magnetohydrodynamic waves propagation in a twisted rotating jet emerging from a filament eruption
• Analysis of 3D plasma motions in a chromospheric jet formed due to magnetic reconnection
• How Rotating Solar Atmospheric Jets Become Kelvin--Helmholtz Unstable
• ALMA Observations of Solar Spicules in a Polar Coronal Hole