Miss. Debopriya Das: Senior Research Scholar at Indian Institute of Technology Kharagpur, India
Article Details
The article titled Lower ionosphere monitoring using magnetotelluric data focuses on investigating the lower ionosphere through magnetotelluric (MT) observations and Schumann Resonance (SR) analysis. The study examines the relationship between variations in SR frequencies and fluctuations in D-region ionospheric electron density. MT data including horizontal electric fields (Ex,EyE_x, E_y) and magnetic fields (Hx,HyH_x, H_y) were collected from the Mahanadi shear zone. Using Fast Fourier Transform spectral analysis with a frequency resolution of 0.016 Hz, the researchers identified noticeable temporal variations in the first three Schumann resonance modes. The work also develops a theoretical coupling model between ELF electromagnetic wave propagation and ionospheric conductivity. Electron density values estimated from MT observations were compared with the FIRI lower ionosphere reference model, showing reasonable agreement. The research demonstrates the capability of ground-based MT systems to monitor ionospheric dynamics continuously.
Novelty
The novelty of this research lies in the integration of magnetotelluric measurements with Schumann Resonance analysis for lower ionosphere monitoring. Most traditional ionospheric studies rely on ionosondes, satellites, incoherent scatter radars, or VLF radio propagation techniques. In contrast, this study introduces MT data as a complementary observational method for estimating D-region electron density. Another innovative feature is the use of naturally occurring ELF electromagnetic signals to infer ionospheric properties without artificial transmitters. The work also presents a theoretical framework that directly couples SR spectral characteristics with ionospheric electron density variations through the Earth–ionosphere waveguide concept. The simultaneous analysis of resonance frequency shifts, amplitude changes, attenuation, and phase behavior under day–night and terminator conditions further enhances the uniqueness of the study.
Impact, Originality, and Experimental Rigor
The study has important scientific impact because it broadens the application of magnetotelluric techniques from solid Earth studies to atmospheric and space physics research. Its originality comes from demonstrating that SR signals observed in MT data can serve as indicators of ionospheric electron density variations. This interdisciplinary combination of geophysics, atmospheric science, and electromagnetic wave theory represents a fresh contribution to lower ionosphere diagnostics. The experimental work is methodologically rigorous, involving high-resolution spectral analysis, averaging of multiple FFT segments, continuous electromagnetic field monitoring, and comparative validation with the established FIRI model. The researchers carefully analyzed multiple resonance modes and accounted for diurnal variability, attenuation differences, and phase shifts, which increases the reliability and robustness of the findings. The combination of observational data and theoretical modeling strengthens the scientific credibility of the research.
Sustainability Impact and Applicability
The proposed monitoring approach has positive sustainability implications because it relies on passive measurements of naturally existing electromagnetic signals rather than energy-intensive active systems. Compared with satellite missions or large radar installations, MT-based ionospheric monitoring can be implemented at lower operational and maintenance costs. This makes the method environmentally sustainable and suitable for long-term continuous observations. The approach may contribute to sustainable space weather monitoring systems, especially in developing regions where advanced infrastructure is limited. In terms of applicability, the method can be used in ionospheric studies, space weather forecasting, ELF wave propagation research, and geophysical hazard investigations. It may also support monitoring of ionospheric disturbances associated with solar activity, geomagnetic storms, earthquakes, and atmospheric variability. Because MT stations already exist in many regions for geophysical surveys, the technique has strong potential for integration into existing observational networks worldwide.
Research Portfolio
Debopriya Das is an emerging researcher in the field of geophysics and electromagnetic Earth science, currently serving as a Senior Research Fellow in the Department of Geology and Geophysics at Indian Institute of Technology Kharagpur. Her academic and research journey has been centered around understanding the Earth’s subsurface and ionospheric processes using advanced electromagnetic methods. She specializes in magnetotelluric (MT) investigations, ionospheric monitoring, induced polarization studies, and computational inversion techniques. Through her research, she aims to contribute to the broader understanding of Earth system dynamics and electromagnetic interactions occurring between the lithosphere and ionosphere. Her work combines theoretical geophysics, signal processing, and data interpretation techniques to address scientific challenges related to subsurface characterization and atmospheric-electromagnetic phenomena.
Online Profile
Debopriya Das actively maintains an academic presence through her ResearchGate profile, where her scientific publications, conference presentations, and ongoing research activities are accessible to the global research community. Her online academic profile reflects her growing contributions in geophysical exploration, electromagnetic prospecting, and ionospheric studies, while also highlighting collaborative research activities with national and international scientists working in related domains. The platform serves as an important medium for disseminating her research findings, networking with researchers, and engaging with current scientific developments in Earth science and space physics.
ResearchGate Profile
Education
Debopriya Das completed her Master of Science (M.Sc.) degree in Geophysics from Indian Institute of Technology Kharagpur in December 2022. During her postgraduate studies, she developed a strong academic foundation in exploration geophysics, electromagnetic theory, geophysical data analysis, signal processing, inversion methodologies, and Earth system science. Her academic training included both theoretical and practical aspects of geophysical prospecting methods, which later guided her specialization toward magnetotelluric investigations and ionospheric research. Her postgraduate research experience further strengthened her analytical and computational skills in handling complex geophysical datasets and interpreting electromagnetic signatures related to subsurface and atmospheric processes.
Research Focus
The primary focus of Debopriya Das’s research lies in electromagnetic methods of prospecting and their applications in Earth science investigations. Her current research emphasizes the use of magnetotelluric (MT) data for ionospheric and lithospheric monitoring, particularly for understanding lower ionosphere electron density variations and conductivity structures. She is also involved in studies related to Schumann resonance analysis, electromagnetic signal interpretation, and induced polarization techniques for subsurface characterization. Her work on time-domain induced polarization (TDIP) inversion and Cole-Cole parameter estimation aims to improve the understanding of geoelectrical properties of the subsurface through advanced inversion algorithms and optimization methods. By integrating observational data with computational approaches, her research contributes to both applied geophysics and atmospheric-electromagnetic studies.
Experience
As a Senior Research Fellow at Indian Institute of Technology Kharagpur, Debopriya Das has gained extensive experience in scientific research, geophysical data processing, electromagnetic signal analysis, and numerical modeling. Her research activities involve handling large magnetotelluric datasets, implementing inversion techniques, studying ionospheric conductivity variations, and interpreting geophysical anomalies associated with lithospheric and atmospheric processes. She has also developed experience in scientific writing, publication preparation, conference presentation, and interdisciplinary collaboration with researchers from different scientific backgrounds. Through her research tenure, she has actively contributed to both national and international scientific discussions in geophysics and electromagnetic Earth science.
Research Timeline & Activities
Following the completion of her M.Sc. degree in 2022, Debopriya Das continued her academic and research career as a Senior Research Fellow at Indian Institute of Technology Kharagpur. In 2023, she presented her research on “Estimation of Cole-Cole Parameters Using Simulated Annealing–Heat Bath Algorithm” at the 2nd Indian Near Surface Geophysics Conference and Exhibition held in New Delhi, India. Her work focused on advanced inversion methodologies for induced polarization studies and attracted attention for its computational approach to parameter estimation. In 2024, she expanded her research interests into ionospheric monitoring and presented her work on electron density estimation using Schumann resonance analysis of magnetotelluric data at the prestigious 26th EM Induction Workshop in Beppu, Japan. The same year, she co-authored a research article in the Arabian Journal of Geosciences related to TDIP data inversion and subsurface characterization. In 2025, she presented further advancements in ionospheric conductivity and electron density profiling using MT data from Odisha, India, at the 3rd Indian Near Surface Geophysics Conference and Exhibition in New Delhi. Her continued research efforts culminated in the publication of the paper “Lower Ionosphere Monitoring Using Magnetotelluric Data” in Earth, Planets and Space in 2026, marking a significant contribution to electromagnetic ionospheric research.
Awards & Honors
Debopriya Das has earned recognition for her academic achievements and research contributions through her appointment as a Senior Research Fellow at Indian Institute of Technology Kharagpur, one of India’s premier institutions for higher education and scientific research. Her active participation in leading national and international scientific conferences demonstrates her growing recognition within the geophysical research community. She has also been selected to present her work at internationally reputed scientific workshops, including the EM Induction Workshop in Japan, reflecting the scientific relevance and quality of her research contributions in electromagnetic geophysics and ionospheric monitoring.
Strength for a Best Innovator Award
Scientific Innovation Strength
Miss. Debopriya Das demonstrates strong innovation by integrating magnetotelluric data with Schumann Resonance analysis for lower ionosphere monitoring.
She extends traditional geophysical methods into atmospheric and space physics applications.
Her approach creates a new interdisciplinary research pathway between solid Earth and ionospheric science.
Novel Method Development
She proposes a passive, continuous monitoring technique for ionospheric electron density estimation.
The method reduces dependence on costly satellite-based systems and active radar methods.
It utilizes naturally occurring ELF electromagnetic signals, making it highly efficient and scalable.
Technical and Analytical Expertise
She has strong capability in FFT spectral analysis, electromagnetic data interpretation, and numerical modeling.
Her work includes handling large MT datasets with high-frequency resolution processing.
She also applies advanced inversion techniques for geophysical parameter estimation.
Research Impact and Recognition
Her research is published in reputed international journals, including Earth, Planets and Space.
She has presented findings at major international conferences in geophysics and electromagnetics.
Her work is gaining visibility in the global scientific community.
Sustainability and Practical Value
Her approach is environmentally sustainable due to its passive measurement nature.
It enables long-term monitoring without high energy consumption or expensive infrastructure.
It has strong potential for real-world applications in space weather and ionospheric observation networks.