62 citations · 235 across the 20 of their papers we have counts for
20 papers
Observations of a Twin Pair of Atypical Solar Flares and a Magnetic-reconnection Scenario
Satyam Agarwal, Alphonse C. Sterling, Shibu K. Mathew +3
We present observations and a magnetic-reconnection scenario of a twin pair of "atypical flares" that occurred on 2022 April 22 in a quadrupolar magnetic configuration formed by tw…
Investigation of magnetic topology and triggering mechanisms of a C-class flare and active-region blowout jet
Yogesh Kumar Maurya, Ramit Bhattacharyya, Peter Wyper
Coronal jets are collimated plasma eruptions which are ubiquitous in the solar atmosphere. Believed to be triggered by magnetic reconnection, these jets can contribute to various p…
On the Magnetic Reconnection and its Properties during a Flare Using a Magnetohydrodynamics Simulation
Sushree S Nayak, Qiang Hu, Wen He +2
We study the magnetic reconnection during a flare by investigating flare ribbon dynamics using observations and data-constrained magnetohydrodynamics (MHD) simulation. In particula…
Data-Constrained Magnetohydrodynamics Simulation of a Confined X-class Flare in NOAA Active Region 11166
Sanjay Kumar, Pawan Kumar, Sadashiv +5
In this paper, we present a magnetohydrodynamics simulation of NOAA active region 11166 to understand the origin of a confined X-class flare that peaked at 23:23 UT on 2011 March 9…
Exploring the magnetic and thermal evolution of a coronal jet
Sushree S Nayak, Samrat Sen, Arpit Kumar Shrivastav +2
Coronal jets are the captivating eruptions which are often found in the solar atmosphere, and primarily formed due to magnetic reconnection. Despite their short-lived nature and lo…
Exploring the generation and annihilation of three dimensional nulls through MHD simulations in initially chaotic magnetic field devoid of nulls
Yogesh Kumar Maurya, Ramit Bhattacharyya, David I. Pontin +1
Three-dimensional (3D) magnetic nulls are abundant in the solar atmosphere, as been firmly established through contemporary observations. They are established to be important magne…
Generation and annihilation of three dimensional magnetic nulls in extrapolated solar coronal magnetic field: Data-based Implicit Large Eddy Simulation
Yogesh Kumar Maurya, Ramit Bhattacharyya, David I. Pontin
Three-dimensional magnetic nulls are the points where magnetic field vanishes and are preferential sites for magnetic reconnection: a process which converts magnetic energy into he…
Study of Reconnection Dynamics and Plasma Relaxation in MHD simulation of a Solar Flare
Satyam Agarwal, Ramit Bhattacharyya, Shangbin Yang
Self-organization in continuous systems is associated with dissipative processes. In particular, for magnetized plasmas, it is known as magnetic relaxation, where the magnetic ener…
Formation of an observed eruptive flux rope above the torus instability threshold through tether-cutting magnetic reconnection
Avijeet Prasad, Sanjay Kumar, Alphonse C. Sterling +4
Erupting magnetic flux ropes (MFRs) play a crucial role in producing solar flares. However, the formation of erupting MFRs in complex coronal magnetic configurations and their subs…
Magnetohydrodynamics simulation of magnetic flux rope formation in a quadrupolar magnetic field configuration
Sanjay Kumar, Avijeet Prasad, Sushree S. Nayak +2
Magnetic flux ropes (MFRs) play an important role in high-energetic events like solar flares and coronal mass ejections in the solar atmosphere. Importantly, solar observations sug…
Hall effect on the magnetic reconnections during the evolution of a three-dimensional magnetic flux rope
Kamlesh Bora, Satyam Agarwal, Sanjay Kumar +1
We present a novel Hall magnetohydrodynamics (HMHD) numerical simulation of a three-dimensional (3D) magnetic flux rope (MFR) -- generated by magnetic reconnections from an initial…
Magnetohydrodynamics evolution of three-dimensional magnetic null in NOAA active region 11515 initiated using non-force-free field extrapolation
Sanjay Kumar, Avijeet Prasad, Ranadeep Sarkar +1
Magnetohydrodynamics simulation of active region NOAA 11515 is performed to examine the initiation of the M5.6 flaring event that starts around 10:43 UT on 2012 July 2. The simulat…
Two-stage evolution of an extended C-class eruptive flaring activity from sigmoid active region NOAA 12734: SDO and Udaipur-CALLISTO observations
Bhuwan Joshi, Prabir K. Mitra, R. Bhattacharyya +4
We present a multi-wavelength investigation of a C-class flaring activity that occurred in the active region NOAA 12734 on 8 March 2019. The investigation utilises data from AIA an…
Evolution of three-dimensional coherent structures in Hall magnetohydrodynamics
Kamlesh Bora, Ramit Bhattacharyya, Piotr K. Smolarkiewicz
The work extends the computational model EULAG-MHD to include Hall magnetohydrodynamics (HMHD)---important to explore physical systems undergoing fast magnetic reconnection at the…
Successive flux rope eruptions from -Sunspots region of NOAA 12673 and associated X-class eruptive flares on 2017 September 6
Prabir K. Mitra, Bhuwan Joshi, Avijeet Prasad +2
In this paper, we present a multi-wavelength analysis of two X-class solar eruptive flares of classes X2.2 and X9.3 that occurred in the sigmoidal active region NOAA 12673 on 2017…
Study of magnetic field topology of active region 12192 using an extrapolated non-force-free magnetic field
A. Prasad, R. Bhattacharyya, Q. Hu +2
The solar active region (AR) 12192 was one of the most flare productive region of solar cycle 24, which produced many X-class flares; the most energetic being an X3.1 flare on Octo…
Simulated evolution of three-dimensional magnetic nulls leading to generation of cylindrically-shaped current sheets
Sanjay Kumar, R. Bhattacharyya
The performed magnetohydrodynamic simulation examines the importance of magnetofluid evolution which naturally leads to current sheets in the presence of three-dimensional (3D) mag…
Evolutionary aspects and north-south asymmetry of soft X-ray flare index during solar cycles 21, 22, and 23
Bhuwan Joshi, R. Bhattacharyya, K. K. Pandey +2
Aims. In this paper, we investigate the temporal evolution and north-south (N-S) asymmetry in the occurrence of solar flares during cycle 21, 22, and 23, and compare the results wi…
On the role of repetitive magnetic reconnections in evolution of magnetic flux-ropes in solar corona
Sanjay Kumar, R. Bhattacharyya, Bhuwan Joshi +1
Parker's magnetostatic theorem extended to astrophysical magnetofluids with large magnetic Reynolds number supports ceaseless regeneration of current sheets and hence, spontaneous…
Evolution of Currents of Opposite Signs in the Flare Productive Solar Active Region NOAA 10930
B. Ravindra, P. Venkatakrishnan, Sanjiv Kumar Tiwari +1
Analysis of a time series of high spatial resolution vector magnetograms of the active region NOAA 10930 available from SOT/SP on-board Hinode revealed that there is a mixture of u…