Could Switchbacks Originate in the Lower Solar Atmosphere? I. Formation Mechanisms of Switchbacks

Magyar, Norbert; Utz, D.; Erdélyi, R.; Nakariakov, V. M.

doi:10.3847/1538-4357/abec49

Cited by 21 publications

(12 citation statements)

References 66 publications

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“…Using 3D MHD simulations, Magyar et al (2021a) examined how photospheric motions at the base of a magnetic flux tube might excite motions that resemble switchbacks. They introduced perturbations at the lower boundary of a pressurebalanced magnetic-field solution, considering either a field-aligned, jet-like flow, or a transverse, vortical flows.…”

Section: Other Solar-surface Processesmentioning

confidence: 99%

Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum

et al. 2023

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Launched on 12 Aug. 2018, NASA’s Parker Solar Probe had completed 13 of its scheduled 24 orbits around the Sun by Nov. 2022. The mission’s primary science goal is to determine the structure and dynamics of the Sun’s coronal magnetic field, understand how the solar corona and wind are heated and accelerated, and determine what processes accelerate energetic particles. Parker Solar Probe returned a treasure trove of science data that far exceeded quality, significance, and quantity expectations, leading to a significant number of discoveries reported in nearly 700 peer-reviewed publications. The first four years of the 7-year primary mission duration have been mostly during solar minimum conditions with few major solar events. Starting with orbit 8 (i.e., 28 Apr. 2021), Parker flew through the magnetically dominated corona, i.e., sub-Alfvénic solar wind, which is one of the mission’s primary objectives. In this paper, we present an overview of the scientific advances made mainly during the first four years of the Parker Solar Probe mission, which go well beyond the three science objectives that are: (1) Trace the flow of energy that heats and accelerates the solar corona and solar wind; (2) Determine the structure and dynamics of the plasma and magnetic fields at the sources of the solar wind; and (3) Explore mechanisms that accelerate and transport energetic particles.

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Section: Other Solar-surface Processesmentioning

confidence: 99%

Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum

et al. 2023

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“…Such results are of particular value for MHD wave simulations as more rapid footpoint motions of the flux-tube, i.e. MBP will yield MHD waves carrying more energy into the higher atmosphere or possibly creating the recently observed magnetic field line switchbacks (e.g., Choudhuri et al 1993;Vigeesh et al 2009;Magyar et al 2021). Finally, with the hindsight of this work, it is even possible to find evidence for the two-component velocity distributions in earlier works such as Bodnárová et al (2014) in which the authors used DOT (Dutch Open Telescope; Rutten et al 2004) data.…”

Section: Discussionmentioning

confidence: 91%

Observational evidence for two-component distributions describing solar magnetic bright points

Saavedra

Utz

Domínguez

et al. 2022

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Context. High-resolution observations of the solar photosphere reveal the presence of fine structures, in particular the so-called Magnetic Bright Points (MBPs), which are small-scale features associated with strong magnetic field regions of the order of kilogauss (kG). It is especially relevant to study these magnetic elements, which are extensively detected in all moments during the solar cycle, in order to establish their contribution to the behavior of the solar atmosphere, and ultimately a plausible role within the coronal heating problem. Aims. Characterisation of size and velocity distributions of MBPs in the solar photosphere in two different datasets of quiet Sun images acquired with high-resolution solar instruments i.e. Solar Optical Telescope SOT/Hinode and the High-resolution Fast Imager HiFI/GREGOR, in the G-band (4308 Å). Methods. In order to detect the MBPs, an automatic segmentation and identification algorithm is used. Next, the identified features were tracked to measure their proper motions. Finally, a statistical analysis of hundreds of MBPs is carried out, generating histograms for areas, diameters and horizontal velocities. Results. This work establishes that areas and diameters of MBPs display log-normal distributions that are well-fitted by two different components, whereas the velocity vector components follow Gaussians and the vector magnitude a Rayleigh distribution revealing again for all vector elements a two component composition. Conclusions. The results can be interpreted as due to the presence of two different populations of MBPs in the solar photosphere one likely related to stronger network magnetic flux elements and the other one to weaker intranetwork flux elemens. In particular this work concludes on the effect of the different spatial resolution of GREGOR and Hinode telescopes, affecting detections and average values.

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“…Defining boundary values and conditions for specific observations can enhance the development of models and initial conditions for simulations that involve the evolution of magnetic field flux tubes, such as magnetic bright points, as shown in Magyar et al (2021). This can provide critical inputs for comprehending the smaller scales of solar dynamics.…”

Section: Discussionmentioning

confidence: 99%

Exploring magnetic field properties at the boundary of solar pores: A comparative study based on SDO-HMI observations

Rozo

Domínguez

Utz

et al. 2023

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Context. The Sun's magnetic fields play an important role in various solar phenomena. Solar pores are regions of intensified magnetic field strength compared to the surrounding photospheric environment, and their study can help us better understand the properties and behaviour of magnetic fields in the Sun. In this work, we investigate the properties of magnetic fields on the boundaries of solar pores, specifically focusing on the evolution of the vertical magnetic field. Aims. Up to now, there exists only a single study on magnetic field properties at the boundary region of a pore. Therefore, the main goal of this work is to increase the statistics of magnetic properties determining the pore boundary region. To this aim, we study the change of the vertical magnetic field on the boundaries of six solar pores and their time evolution. Methods. We analyse six solar pores using data from the Helioseismic and Magnetic Imager instrument on board the Solar Dynamics Observatory. We apply image processing techniques to extract the relevant features of the solar pores and determine the boundary conditions of the magnetic fields. For each pore, the maximal vertical magnetic field is determined, and the obtained results are compared with the above-mentioned previous study. Results. We find the maximal vertical magnetic field values on the boundaries of the studied solar pores to range from 1400 G to 1600 G, with a standard deviation between 7.8% and 14.8%. These values are lower than those reported in the mentioned preceding study. However, this can be explained by differences in spatial resolution as well as the type of data we used. For all the pores, we find that the magnetic inclination angle lies in a range of 30 ± 7°, which is consistent with the idea that the magnetic field configuration in solar pores is mainly vertical. Conclusions. The vertical magnetic field is an important factor in determining the boundary of solar pores, and it plays a more relevant role than the intensity gradient. The obtained information will be useful for future studies on the formation and evolution of magnetic structures of the Sun. Additionally, this study highlights the importance of high spatial resolution data for the purpose of accurately characterising the magnetic properties of solar pores. Overall, the findings of this work contribute to the understanding of the magnetic field properties of the Sun and will be crucial for improving models of solar dynamics and magnetic flux emergence.

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Could Switchbacks Originate in the Lower Solar Atmosphere? I. Formation Mechanisms of Switchbacks

Cited by 21 publications

References 66 publications

Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum

Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum

Observational evidence for two-component distributions describing solar magnetic bright points

Exploring magnetic field properties at the boundary of solar pores: A comparative study based on SDO-HMI observations

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