Bio: Hi, I am a dedicated researcher in Astrophysics and Space Science, currently pursuing a Ph.D. at the Center of Excellence in Space Sciences India (CESSI), Indian Institute of Science Education and Research (IISER) Kolkata. Under the mentorship of Prof. Dibyendu Nandi, my research focuses on understanding the underlying physical processes and predicting the geomagnetic impact of Coronal Mass Ejections. With an M.Sc in Physics from West Bengal State University and a B.Sc in Physics from Rishi Bankim Chandra College, I possess expertise in astrophysics, magnetohydrodynamics, programming languages, and visualization tools. My accomplishments as a teaching assistant and presentations at prestigious conferences showcase my passion for advancing scientific knowledge. I actively participate in scientific organizations like the Astronomical Society of India and the American Geophysical Union. In addition to my scientific pursuits, I find joy in expressing my thoughts through Bengali poems and capturing moments with my mobile camera.
And 3D Modelling of Space Plasma
And Induced Geomagnetic Storms.
And Prediction of Geomagnetic Storms
And other aspects of Star-Planet Interactions
And the Dynamic Geomagnetosphere.
Affiliation: Center of Excellence in Space Sciences India (CESSI), Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, India
CGPA (Course Work): 9.38/10.00
Supervisor: Prof. Dibyendu Nandi
Affiliation: West Bengal State University, Barasat, India
Specialization: Astrophysics, Cosmology, Computational Physics, High Energy Physics
MSc Thesis: Accretion properties of rotating naked singularities and the generalised pseudo-Newtonian potential for studying accretion disk dynamics of rotating naked singularities.
Advisor: Prof. Parthasarathi Joarder
Institute: Centre for Astroparticle Physics & Space Sciences, Bose Institute, Kolkata, India
Affiliation: Rishi Bankim Chandra College, Naihati, India
University: West Bengal State University
Marks: 72.38% (First Class)
Organization: Indian Institute of Science Education and Research (IISER) Kolkata
Organization: Idrakpur Primary School, Nadia District Primary School Council, Government of West Bengal
Research Articles and Proceedings
Conferences and Workshops Attended
Achievements and Awards
Authors: Souvik Roy and Dibyendu Nandi
Journal: The Astrophysical Journal Letters, Volume: 950, Issue: 2, Pages: L11
Abstract: To understand the global-scale physical processes behind coronal mass ejection (CME)–driven geomagnetic storms and predict their intensity as a space weather forecasting measure, we develop an interplanetary CME flux rope–magnetosphere interaction module using 3D magnetohydrodynamics. The simulations adequately describe CME-forced dynamics of the magnetosphere including the imposed magnetotail torsion. These interactions also result in induced currents, which are used to calculate the geomagnetic perturbation. Through a suitable calibration, we estimate a proxy of geoeffectiveness—the Storm Intensity index (STORMI)—that compares well with the Dst/SYM-H index. Simulated impacts of two contrasting CMEs quantified by the STORMI index exhibit a high linear correlation with the corresponding Dst and SYM-H indices. Our approach is relatively simple, has fewer parameters to be fine-tuned, and is time efficient compared to complex fluid-kinetic methods. Furthermore, we demonstrate that flux rope erosion does not significantly affect our results. Thus our method has the potential to significantly extend the time window for predictability—an outstanding challenge in geospace environment forecasting—if early predictions of near-Earth CME flux rope structures based on near-Sun observations are available as inputs. This study paves the way for early warnings based on operational predictions of CME-driven geomagnetic storms.Read more
Authors: Dibyendu Nandy, Yoshita Baruah, Prantika Bhowmik, Soumyaranjan Dash, Sakshi Gupta, Soumitra Hazra, B Lekshmi, Sanchita Pal, Shaonwita Pal, Souvik Roy, Chitradeep Saha, Suvadip Sinha
Journal: Journal of Atmospheric and Solar-Terrestrial Physics, Pages: 106081
Abstract: Our host star, the Sun, is a middle-aged main sequence G type star whose activity varies. These variations are primarily governed by solar magnetic fields which are produced in the Sun’s interior via a magnetohydrodynamic dynamo mechanism. Solar activity manifests across different timescales, spanning transient phenomena such as flares, energetic particle events and coronal mass ejections to short to long-term modulation of solar irradiance, plasma winds, open flux and cosmic ray flux in the heliosphere. Collectively, these phenomena define space weather and space climate, which impact the state of the near-Earth space environment, the Earth’s magnetosphere, atmosphere and our space-reliant technologies. Understanding physical processes that are at the heart of solar variability and which causally connect the Sun–Earth system is therefore of immense importance to humanity. Such understanding leads to predictions of the impact of solar activity on our planet and provides a window to explore the plasma universe and other star–planet systems, including assessing the habitability of (exo)planets. In this review, based on our research on the solar–terrestrial system and extant scientific literature, we illuminate processes related to the genesis of solar magnetic fields in the Sun’s interior, their emergence and evolution, their manifestation as solar eruptive events, and their eventual impact on the geospace environment mediated via solar winds and storms. We focus on few phenomena that establish causal connections and demonstrate how our current understanding can lead to development of predictive capabilities encompassing the domain of heliophysics.Read more