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
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
Light Bridge and Magnetic Field in a Solar Active Region
The Astrophysical Journal, 2022 Abstract Observational data from the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory and the multiwavelength simultaneous imaging system attached to the New Vacuum Solar Telescope located at Fuxian Lake, China are employed for the study of light bridges and magnetic fields in the active region NOAA 12529. Coronal
Huaning Wang +4 more
openaire +1 more source
Measurements of Coronal Magnetic Field Strengths in Solar Active Region Loops [PDF]
The Astrophysical Journal Letters, 2021 Abstract The characteristic electron densities, temperatures, and thermal distributions of 1 MK active region loops are now fairly well established, but their coronal magnetic field strengths remain undetermined. Here we present measurements from a sample of coronal loops observed by the Extreme-ultraviolet Imaging Spectrometer on Hinode.
David H. Brooks +2 more
openaire +2 more sources
Strong Transverse Photosphere Magnetic Fields and Twist in Light Bridge Dividing Delta Sunspot of Active Region 12673 [PDF]
, 2018 Solar Active Region (AR) 12673 is the most flare productive AR in the solar cycle 24. It produced four X-class flares including the X9.3 flare on 06 September 2017 and the X8.2 limb event on 10 September.
Haimin Wang +5 more
semanticscholar +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
A New Magnetic Parameter of Active Regions Distinguishing Large Eruptive and Confined Solar Flares [PDF]
Astrophysical Journal Letters, 2022 With the aim of investigating how the magnetic field in solar active regions (ARs) controls flare activity, i.e., whether a confined or eruptive flare occurs, we analyze 106 flares of Geostationary Operational Environmental Satellite class ≥M1.0 during ...
Ting Li +5 more
semanticscholar +1 more source
Impulsive coronal heating during the interaction of surface magnetic fields in the lower solar atmosphere [PDF]
Astronomy & Astrophysics, 2020 Coronal plasma in the cores of solar active regions is impulsively heated to more than 5 MK. The nature and location of the magnetic energy source responsible for such impulsive heating is poorly understood.
L. P. Chitta +3 more
semanticscholar +1 more source
QUASI-STATIC THREE-DIMENSIONAL MAGNETIC FIELD EVOLUTION IN SOLAR ACTIVE REGION NOAA 11166 ASSOCIATED WITH AN X1.5 FLARE [PDF]
, 2014 We study the quasi-static evolution of coronal magnetic fields constructed from the non-linear force-free field (NLFFF) approximation aiming to understand the relation between the magnetic field topology and ribbon emission during an X1.5 flare in active
P. Vemareddy, T. Wiegelmann
semanticscholar +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 +2 more
openaire +1 more source