Results 21 to 30 of about 5,580 (257)
The Initiation and Back-reaction of the X5.4 Flare on 2012 March 7
The Astrophysical Journal, 2023 In this paper, we study the evolution of the X5.4 flare (SOL2012-03-07T00:02) in NOAA Active Region 11429, focusing on its initiation mechanisms and back-reaction effects.
Nian Liu +4 more
doaj +1 more source
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 +3 more
doaj +1 more source
Chromospheric Magnetic Field of Solar Active Regions
The Astrophysical Journal, 2001 The three-dimensional magnetic field structure of 137 solar active regions is studied by comparing the observed and computed chromospheric magnetograms. The model chromospheric field is obtained by extrapolating the observed photospheric field into the chromosphere with a potential (current-free) magnetic-field model in Cartesian geometry.
Debi Prasad Choudhary +2 more
openaire +1 more source
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 +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 +3 more
openaire +1 more source
Record-breaking Coronal Magnetic Field in Solar Active Region 12673 [PDF]
The Astrophysical Journal Letters, 2019 Abstract The strongest magnetic fields on the Sun are routinely detected at dark sunspots. The magnitude of the field is typically about 3000 G, with only a few exceptions that reported the magnetic field in excess of 5000 G. Given that the magnetic field decreases with height in the solar atmosphere, no coronal magnetic field above ...
Sergey A. Anfinogentov +3 more
openaire +2 more sources
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 +2 more
openaire +1 more source
Inversion of the intensity-magnetic field relationship in solar active regions [PDF]
Astronomy & Astrophysics, 2003 We discuss the relationship between the EUV spectral line intensities and the photospheric magnetic flux in solar active regions. Since the histograms of the magnetic flux density in active region plages can be approximated by an exponential function, the equation describing how the observed total line intensity integrated over an active region area ...
A. Fludra, J. Ireland
openaire +1 more source
Charge Generation and Recombination Pathways in All‐Polymer Bulk Heterojunction Solar Cells
Advanced Functional Materials, EarlyView.Multimodal spectroscopy and device analysis reveal how field‐dependent charge generation, transport limitations, and non‐geminate recombination govern performance losses in all polymer solar cells. The results identify the key processes controlling charge extraction and recombination, providing insights for the design of more efficient all‐polymer ...
Shahidul Alam +17 more
wiley +1 more source
Temporal Evolution of Sunspot Groups and Increase in the Open Flux during Solar Maximum in Cycle 24
The Astrophysical JournalThe evolution of the global solar magnetic field directly impacts the interplanetary magnetic field (IMF). During the solar maximum of Cycle 24, the monthly averaged IMF strength doubled over five Carrington rotations (CRs) in late 2014.
Minami Yoshida +3 more
doaj +1 more source