Results 31 to 40 of about 11,108,449 (286)

Confinedness of an X3.1-class Solar Flare Occurred in NOAA 12192: Analysis from Multi-instrument Observations

The Astrophysical Journal, 2023
The nonassociation of coronal mass ejections with high energetic flares is sparse. For this reason, the magnetic conditions required for the confinedness of major flares is a topic of active research.
N. Vasantharaju, F. Zuccarello, F. Ferrente, S. L. Guglielmino   +3 more
doaj   +1 more source

The investigation of quasi-separatrix layers in solar magnetic fields [PDF]

, 2011
The structure of the magnetic field is often an important factor in many energetic processes in the solar corona. To determine the topology of the magnetic field features such as null points, separatrix surfaces, and separators must be found.
Restante, Anna Lisa
core   +2 more sources

Unveiling the Mechanism for the Rapid Acceleration Phase in a Solar Eruption

The Astrophysical Journal Letters, 2023
Two major mechanisms have been proposed to drive the solar eruptions: the ideal magnetohydrodynamic instability and the resistive magnetic reconnection. Due to the close coupling and synchronicity of the two mechanisms, it is difficult to identify their ...
Ze Zhong, Yang Guo, Thomas Wiegelmann, M. D. Ding, Yao Chen   +4 more
doaj   +1 more source

Solar Flare Prediction and Magnetic Field Evolution in Solar Active Region [PDF]

Highlights of Astronomy, 2002
AbstractThe authors propose a number of empirical criteria for prediction of solar flares based on many years of observations at Huairou Solar Observing Station of Beijing Astronomical Observatory.
H.N. Wang, G.Q. Zhang, C.L. Zhu, J.L. Sun   +3 more
openaire   +1 more source

Particle acceleration in the presence of weak turbulence at an X-type neutral point [PDF]

, 2012
We simulate the likely noisy situation near a reconnection region by superposing many 2D linear reconnection eigenmodes. The superposition of modes on the steady state X-type magnetic field creates multiple X- and O-type neutral points close to the ...
Petkaki, P., MacKinnon, A.L., Burge, C. A., MacKinnon, A. L., Burge, C.A.   +4 more
core   +1 more source

Active region chromospheric magnetic fields

, 2021
Context. A proper estimate of the chromospheric magnetic fields is thought to improve modelling of both active region and coronal mass ejection evolution. However, because the chromospheric field is not regularly obtained for sufficiently large fields of
G. J. M. Vissers, J. Leenaarts, J. de la Cruz Rodríguez, C. J. Díaz Baso, J. M. da Silva Santos, T. Wiegelmann, S. Danilovic, X. Zhu, Leenaarts, J., Rodríguez, J. de la Cruz, Danilovic, Sanja,, Vissers, G. J. M., Vissers, Gregal J. M.,, Danilovic, S., Baso, C. J. Díaz, Díaz Baso, Carlos José,, de la Cruz Rodríguez, Jaime,, da Silva Santos, João Manuel,, Leenaarts, Jorrit,, Santos, J. M. da Silva, Wiegelmann, T., Zhu, X., Díaz Baso, C., da Silva Santos, J., Vissers, G., de la Cruz Rodríguez, J.   +25 more
core   +1 more source

Extreme ultraviolet imaging of three-dimensional magnetic reconnection in a solar eruption [PDF]

, 2015
X.C., J.Q.S., M.D.D., Y.G., P.F.C. and C.F. are supported by NSFC through grants 11303016, 11373023, 11203014 and 11025314, and by NKBRSF through grants 2011CB811402 and 2014CB744203. C.E.P. and S.J.E. are supported by the UK STFC. J.Z.
Sun, J.Q., Fang, C., Priest, E.R., Guo, Y., Edwards, S.J., Cheng, X., Parnell, C.E., Zhang, J., Ding, M.D., Chen, P.F., Priest, E.R.; id_orcid, Parnell, C.E.; id_orcid   +11 more
core   +1 more source

The Life Cycle of Active Region Magnetic Fields [PDF]

, 2016
We present a contemporary view of how solar active region magnetic fields are understood to be generated, transported and dispersed. Empirical trends of active region properties that guide model development are discussed.
Thompson, M., van Driel-Gesztelyi, Lidia, Cheung, Mark C. M., Cheung, M., M. J. Thompson, Thompson, MJ, Thompson, Michael J., Cheung, MCM, V. Martínez Pillet, van Driel-Gesztelyi, L, Martinez Pillet, Valentin, Martínez Pillet, V, L. van Driel-Gesztelyi, M. C. M. Cheung, Martínez Pillet, V., van Driel-Gesztelyi, L.   +15 more
core   +1 more source

Current Sheet Fragmentation in the Course of Repeated Eruptive Magnetic Flux Emergence

The Astrophysical Journal
Magnetic reconnection between emerging magnetic flux and the ambient coronal field fundamentally drives solar jets. We use 3D resistive-MHD simulations of eruptive flux emergence to investigate how the large-scale current sheet formed at the interface ...
Vaggelis Karantanis, Loukas Vlahos, Heinz Isliker, Angelos Giannis, Vasilis Archontis   +4 more
doaj   +1 more source

Modeling Nonpotential Magnetic Fields in Solar Active Regions

The Astrophysical Journal, 2008
Electric currents are present in the coronae above solar active regions, producing nonpotential magnetic fields that can be approximated as nonlinear force-free fields (NLFFFs). In this paper NLFFF models for two active regions observed in 2002 June are presented.
M. G. Bobra, A. A. van Ballegooijen, E. E. DeLuca   +2 more
openaire   +1 more source