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Jets often have a helical structure containing ejected plasma that is both hot and also cooler and denser than the corona. Various mechanisms have been proposed to explain how jets are primarily attributed to a magnetic reconnection between…

Solar and Stellar Astrophysics · Physics 2020-10-21 Reetika Joshi , Brigitte Schmieder , Guillaume Aulanier , Véronique Bommier , Ramesh Chandra

In-situ observations in the Earth's and Saturn's magnetosheaths and in the solar wind reveal the presence of Alfv\'en vortices as intermittent structures in the range of scales from fluid lengths down to few ion lengths. The density and the…

Plasma Physics · Physics 2020-04-16 Dusan Jovanovic , Olga Alexandrova , Milan Maksimovic , Milivoj Belic

In this work, we investigate the formation of a magnetic flux rope (MFR) above the central polarity inversion line (PIL) of NOAA Active Region 12673 during its early emergence phase. Through analyzing the photospheric vector magnetic field,…

Solar and Stellar Astrophysics · Physics 2019-10-15 Lijuan Liu , Xin Cheng , Yuming Wang , Zhenjun Zhou

Magnetic flux rope (MFR) is a coherent and helical magnetic field structure that is recently found probably to appear as an elongated hot-channel prior to a solar eruption. In this paper, we investigate the relationship between the…

Solar and Stellar Astrophysics · Physics 2015-06-22 X. Cheng , M. D. Ding , J. Zhang , A. K. Srivastava , Y. Guo , P. F. Chen , J. Q. Sun

One "strong" magnetic cloud (MC) with the magnetic field magnitude reaching $\sim$ 40 nT at 1 au during 2012 June 16-17 is examined in association with a pre-existing magnetic flux rope (MFR) identified on the Sun. The MC is characterized…

Solar and Stellar Astrophysics · Physics 2022-08-03 Qiang Hu , Chunming Zhu , Wen He , Jiong Qiu , Lan K. Jian , Avijeet Prasad

We present 3-d numerical magneto-hydrodynamic simulations of a buoyant, twisted magnetic flux rope embedded in a stratified, solar-like model convection zone. The flux rope is given an initial twist such that it neither kinks nor fragments…

Astrophysics · Physics 2009-11-07 S. B. F. Dorch , B. V. Gudiksen , W. P. Abbett , Aa. Nordlund

We analyse the forces that control the dynamic evolution of a flux rope eruption in a three-dimensional (3D) radiative magnetohydrodynamic (RMHD) simulation. The confined eruption of the flux rope gives rise to a C8.5 flare. The flux rope…

Solar and Stellar Astrophysics · Physics 2023-08-23 Can Wang , Feng Chen , Mingde Ding , Zekun Lu

The combination of magnetohydrodynamic (MHD) simulation and multi-wavelength observations is an effective way to study mechanisms of magnetic flux rope eruption. We develop a data-driven MHD model using the zero-$\beta$ approximation. The…

Solar and Stellar Astrophysics · Physics 2019-01-23 Yang Guo , Chun Xia , Rony Keppens , M. D. Ding , P. F. Chen

Magnetic flux rope (MFR) plays an important role in solar activities. A quantitative assessment of the topology of an MFR and its evolution is crucial for a better understanding of the relationship between the MFR and the associated…

Solar and Stellar Astrophysics · Physics 2016-07-06 Kai Yang , Yang Guo , M. D. Ding

Plasma-mediated interaction between astrophysical objects can play an important role and produce electromagnetic radiation in various binary systems, ranging from planet-moon and star-planet systems to binary compact objects. We perform 3D…

High Energy Astrophysical Phenomena · Physics 2025-11-20 Nicholas Corso , Dong Lai

Small magnetic fluctuations ($B_1/B_0 \sim 10^{-4}$) are intrinsically present in a magnetic confinement plasma due to turbulent currents. While the perpendicular transport of particles and heat is typically dominated by fluctuations of the…

Plasma Physics · Physics 2025-01-10 Kaiyu Zhang , Wladimir Zholobenko , Andreas Stegmeir , Konrad Eder , Frank Jenko

Imaging microwave observations of an eruptive, partially occulted solar flare on 18 April 2001 suggest that the global structure of the event can be described by the helical kink instability of a twisted magnetic flux rope. This model is…

Solar and Stellar Astrophysics · Physics 2015-05-19 M. Karlický , B. Kliem

We investigate the transport coefficients $\alpha$ and $\beta$ in plasma systems with varying Reynolds numbers while maintaining a unit magnetic Prandtl number. {The $\alpha$ and $\beta$ tensors parameterize the turbulent electromotive…

Plasma Physics · Physics 2025-06-27 Kiwan Park

We investigated the dynamic evolution of a 3-dimensional (3D) flux rope eruption and magnetic reconnection process in a solar flare, by simply extending 2-dimensional (2D) resistive magnetohydrodynamic simulation model of solar flares with…

Solar and Stellar Astrophysics · Physics 2013-09-18 Keisuke Nishida , Naoto Nishizuka , Kazunari Shibata

Recent pulsed-power experiments have demonstrated the formation of astrophysically-relevant, differentially rotating plasmas [1]. Key features of the plasma flows are the discovery of a quasi-Keplerian rotation curve, the launching of…

We report a new, plasmoid-fed scenario for the formation of an eruptive prominence (PF$^2$), involving reconnection and condensation. We use grid-adaptive resistive two-and-a-half-dimensional magnetohydrodynamic (MHD) simulations in a…

Solar and Stellar Astrophysics · Physics 2022-04-06 Xiaozhou Zhao , Rony Keppens

The field of fast radio bursts (FRBs) has entered the age of fine characterization as observational results from different radio telescopes become more and more abundant. The large FRB sample is suitable for a statistical study. There is an…

High Energy Astrophysical Phenomena · Physics 2023-12-25 Di Xiao , Zi-Gao Dai , Xue-Feng Wu

The aim of this research is to simulate the interaction of the solar wind with the magnetic field of Mercury and to study the particle fluxes between the magnetosheath and the planet surface. We simulate the magnetosphere structure using…

Earth and Planetary Astrophysics · Physics 2016-08-17 J. Varela , F. Pantellini , M. Moncuquet

The relationship between a decaying plasma turbulence and proton fire hose instabilities in a slowly expanding plasma is investigated using three-dimensional (3-D) hybrid expanding box simulations. We impose an initial ambient magnetic…

Space Physics · Physics 2019-10-10 P. Hellinger , L. Matteini , S. Landi , L. Franci , A. Verdini , E. Papini

Context. Data-constrained models incorporate observed photospheric magnetic fields. However, due to the lack of magnetic field information in the rest of the solar atmosphere, models rely on extrapolations that, in most cases, neglect the…

Solar and Stellar Astrophysics · Physics 2026-05-20 M. V. Sieyra , A. Strugarek , A. Prasad , A. Wagner , P. Démoulin , F. Moreno-Insertis , A. J. Finley , R. Joshi , A. Blaise , A. S. Brun , E. Buchlin