A5068269656- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Magnetic confinement fusion research
- Solar Radiation and Photovoltaics
- Impact of Light on Environment and Health
- Oil, Gas, and Environmental Issues
- Meteorological Phenomena and Simulations
University of Alabama in Huntsville
2023
Udaipur Solar Observatory
2018-2022
Indian Institute of Technology Gandhinagar
2021-2022
Physical Research Laboratory
2018
In this paper, we present a magnetohydrodynamics simulation of NOAA active region 11166 to understand the origin confined X-class flare that peaked at 23:23 UT on 2011 March 9. The is initiated with magnetic field extrapolated from corresponding photospheric magnetogram using non-force-free-field extrapolation technique. Importantly, initial configuration identifies three-dimensional (3D) nulls and quasi-separatrix layers (QSLs), which nearly agree bright structures appeared in...
Abstract The magnetohydrodynamics of the solar corona is simulated numerically. simulation initialized with an extrapolated non-force-free magnetic field using vector magnetogram active region NOAA 12192, which was obtained from photosphere. Particularly, we focus on reconnections (MRs) occurring close to a null point that resulted in appearance circular chromospheric flare ribbons 2014 October 24 around 21:21 UT, after peak X3.1 flare. lines show presence three-dimensional (3D) near one...
Abstract Magnetohydrodynamic simulation is carried out for the NOAA AR 12615 in time span t ∈ {05:48, 06:18} UT on 2016 December 5; covering events of a blowout jet and C1.2 flare. The are selected based small interval between their occurrences, which provides us with an opportunity to explore two energetically different magnetic reconnection (MR) within run single magnetohydrodynamic (MHD) simulation. initiated field extrapolated from vector magnetogram provided by Helioseismic Magnetic...
Abstract Understanding the mechanisms underlying heating of solar atmosphere is a fundamental problem in physics. The lower Sun (i.e., photosphere and chromosphere) composed weakly ionized plasma. This results anisotropic dissipation electric currents by Coulomb Cowling resistivities. Joule due to perpendicular magnetic field resistivity has been demonstrated be main mechanism for sunspot umbral light bridge located NOAA AR 12002 on 2014 March 13. Here, we focus same target region...
Abstract Three-dimensional magnetic nulls relate to topology, and are propitious for triggering solar coronal transients. Although abundant in nature, their generation is not established. This paper reports magnetohydrodynamic simulations indicating the be dissipative self-organized structures. Categorically, results of two case studies presented. First, a potential null located at origin Cartesian coordinate system subjected sinusoidal flow. The seen bifurcate while conserving net...
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Abstract Magnetic field plays an important role in various solar eruption phenomena. The formation and evolution of the characteristic magnetic topology eruptions are critical problems that will ultimately help us understand origin these source regions. With development advanced techniques instruments, observations with higher resolutions different wavelengths fields view have provided more quantitative information for finer structures. It is therefore essential to improve method which we...
ABSTRACT Coronal loops are the basic building blocks of solar atmosphere and observed on various length scales. However, their formation mechanism is still unclear. In this paper, we present spectroscopic imaging observations small-scale transients subsequent transient loops. For purpose, have utilized multiwavelength recorded by Atmospheric Imaging Assembly (AIA) Interface Region Spectrograph (IRIS) slit-jaw imager (SJI), along with measurements provided IRIS. photospheric magnetic field...
We present a three-dimensional magnetohydrodynamic simulation of the NOAA active region 12017 to explore onset an X-class flare on 2014 March 29 at 17:48 UT. The is initiated with magnetic field constructed by non-force-free-field extrapolation photospheric field. Importantly, initial contains null, pair flux ropes, and set sheared arcades overlying ropes location. A lines are also identified which connect flaring location distant affected flare. simulated evolution documents reconnections...
Coronal jets are the captivating eruptions which often found in solar atmosphere, and primarily formed due to magnetic reconnection. Despite their short-lived nature lower energy compared many other eruptive events, e.g. flares coronal mass ejections, they play an important role heating corona accelerating charged particles. However, generation ambience of non-standard flare regime is not fully understood, warrant a deeper investigation, terms onset, growth, eruption processes, thermodynamic...
Abstract Coronal jets are the captivating eruptions that often found in solar atmosphere and primarily formed due to magnetic reconnection. Despite their short-lived nature lower energy compared many other eruptive events, e.g., flares coronal mass ejections, they play an important role heating corona accelerating charged particles. However, generation ambience of nonstandard flare regime is not fully understood, warrant a deeper investigation, terms onset, growth, eruption processes,...
Magnetic flux ropes (MFRs) play an important role in high-energetic events like solar flares and coronal mass ejections the atmosphere. Importantly, observations suggest association of some flaring with quadrupolar magnetic configurations. However, formation subsequent evolution MFRs such configurations still need to be fully understood. In this paper, we present idealized magnetohydrodynamics (MHD) simulations MFR a configuration. A suitable initial field having configuration is constructed...
Whitepaper #361 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research; infrastructure/workforce/other programmatic. Additional solar physics; research tools infrastructure.
Magnetic field plays an important role in various solar eruptions like flares, coronal mass ejections, etc. The formation and evolution of characteristic magnetic topology are critical problems that will ultimately help us understand the origination these source regions. With development advanced techniques instruments, observations with higher resolutions different wavelengths fields view have provided more quantitative information for finer structures. So it is essential to improve our...
The coronal magnetic Ąeld is the prime driver behind many as-yet unsolved mysteries: solar eruptions, heating, and wind, to name a few.It is, however, still poorly observed understood.We highlight key questions related energy storage, release, transport in corona, their relationship these important problems.We advocate for new multi-point co-optimized measurements, sensitive other plasma parameters, spanning from optical γ-ray wavelengths, bring closure long-standing fundamental questions.We...
Magnetic reconnections (MRs) for various magnetic field line (MFL) topologies are believed to be the initiators of solar eruptive events like flares and coronal mass ejections (CMEs). Consequently, important is a thorough understanding quantification MFL topology their evolution which leads MRs. Contemporary standard extrapolate MFLs using equilibrium models where Lorentz force on plasma zero everywhere, because either there no current or parallel field. In tandem, non-force-free-field...
Abstract The solar active region (AR) 12192 was one of the most flare productive cycle 24, which produced many X-class flares; energetic being an X3.1 on October 2014 at 21:10 UT. Customarily, such events are believed to be triggered by magnetic reconnection in coronal fields. Here we use vector magnetograms from photosphere, obtained Heliospheric Magnetic Imager (HMI) investigate field topology prior event, and ascertain conditions that might have caused flare. To infer field, a novel...