39 citations · 325 across the 32 of their papers we have counts for
34 papers
uGMRT Polarization Observations with Walsh Modulation
Salmoli Ghosh, Preeti Kharb, Sandeep Chaudhari +1
In this report, we discuss the performance of the Walsh phase-switching scheme for Band 4 (550-750 MHz) polarimetric observations with the upgraded GMRT (uGMRT). We have carried ou…
Coronal Magnetography using Spectropolarimetry with SKA Telescopes
Deepan Patra, Puja Majee, Soham Dey +6
The solar coronal magnetic field drives nearly every aspect of solar phenomena and activity -- from flares, coronal mass ejections, and solar wind that governs space weather to the…
State-of-the-art Observation, Calibration, and Imaging Framework for Solar and Heliospheric Sciences with SKA
Divya Oberoi, Devojyoti Kansabanik, Soham Dey +6
The Sun is a surprisingly difficult radio source to observe and image, even with the SKA. It is multiple orders brighter than the typical radio sources, which sensitive radio teles…
First Robust Detection of Linear Polarization from Metric Solar Emissions: Challenging Established Paradigms
Soham Dey, Devojyoti Kansabanik, Divya Oberoi +1
Polarimetric radio observations of the Sun can provide rich information about emission mechanisms and the propagation medium. For the past five decades, solar polarimetric studies…
Observation and Modeling of Small Spatial Structures of Solar Radio Noise Storms using the uGMRT
Surajit Mondal, Peijin Zhang, Devojyoti Kansabanik +2
One of the most commonly observed solar radio sources in the metric and decametric wavelengths is the solar noise storm. These are generally associated with active regions and are…
A Formalism for Calibrating the Instrumental Polarization of Radio Interferometric Arrays at Meter Wavelengths using Unpolarized Sky: A Demonstration using the MWA Observations
Devojyoti Kansabanik, Angelos Vourlidas, Soham Dey +2
Calibration of instrumental polarization is critical for measuring polarized radio emissions from astrophysical sources to extract the magnetic field information in astrophysical,…
New Insights into Type-I Solar Noise Storms from High Angular Resolution Spectroscopic Imaging with the Upgraded Giant Metrewave Radio Telescope
Surajit Mondal, Devojyoti Kansabanik, Divya Oberoi +1
Type-I solar noise storms are perhaps the most commonly observed active radio emissions from the Sun at meter-wavelengths. Noise storms have a long-lived and wideband continuum bac…
Spectropolarimetric Radio Imaging of Faint Gyrosynchrotron Emission from a CME : A Possible Indication of the Insufficiency of Homogeneous Models
Devojyoti Kansabanik, Surajit Mondal, Divya Oberoi
The geo-effectiveness of coronal mass ejections (CMEs) is determined primarily by their magnetic fields. Modeling of Gyrosynchrotron (GS) emission is a promising remote sensing tec…
Spectroscopic Imaging of the Sun with MeerKAT: Opening a New Frontier in Solar Physics
Devojyoti Kansabanik, Surajit Mondal, Divya Oberoi +7
Solar radio emissions provide several unique diagnostics to estimate different physical parameters of the solar corona, which are otherwise simply inaccessible. However, imaging th…
Characterizing the Spectral Structure of Weak Impulsive Narrowband Quiet Sun Emissions
Surajit Mondal, Divya Oberoi, Ayan Biswas +1
Weak Impulsive Narrowband Quiet Sun Emissions (WINQSEs) are a newly discovered class of radio emission from the solar corona. These emissions are characterized by their extremely i…
An unsupervised machine learning based algorithm for detecting Weak Impulsive Narrowband Quiet Sun Emissions and characterizing their morphology
Shabbir Bawaji, Ujjaini Alam, Surajit Mondal +2
The solar corona is extremely dynamic. Every leap in observational capabilities has been accompanied by unexpected revelations of complex dynamic processes. The ever more sensitive…
Space Weather Research using Spectropolarimetric Radio Imaging Combined With Aditya-L1 and PUNCH Missions
Devojyoti Kansabanik, Surajit Mondal, Divya Oberoi +1
Low-frequency radio observations have been expected to serve as a powerful tool for Space Weather (SW) observations for decades. Radio observations are sensitive to a wide range of…
Quantifying Energy Release in Solar Flares and Solar Eruptive Events: New Frontiers with a Next-Generation Solar Radio Facility
Bin Chen, Dale E. Gary, Sijie Yu +16
Solar flares and the often associated solar eruptive events serve as an outstanding laboratory to study the magnetic reconnection and the associated energy release and conversion p…
Radio Imaging Spectropolarimetry of CMEs and CME Progenitors
Bin Chen, Timothy S. Bastian, Sarah Gibson +8
Coronal mass ejections (CMEs) are the most important drivers of space weather. Central to most CMEs is thought to be the eruption of a bundle of highly twisted magnetic field lines…
Radio Studies of the Middle Corona: Current State and New Prospects in the Next Decade
Bin Chen, Jason E. Kooi, David B. Wexler +13
The "middle corona," defined by West et al. (2022) as the region between ~1.5-6 solar radii, is a critical transition region that connects the highly structured lower corona to the…
Multifrequency microwave imaging of weak transients from the quiet solar corona
Surajit Mondal, Bin Chen, Sijie Yu
Understanding the dynamics of the quiet solar corona is important for answering key questions including the coronal heating problem. Multiple studies have suggested small-scale mag…
Deciphering Faint Gyrosynchrotron Emission from Coronal Mass Ejection using Spectro-polarimetric Radio Imaging
Devojyoti Kansabanik, Surajit Mondal, Divya Oberoi
Measurements of the plasma parameters of coronal mass ejections (CMEs), particularly the magnetic field and nonthermal electron population entrained in the CME plasma, are crucial…
Study of radio transients from the quiet Sun during an extremely quiet time
Surajit Mondal, Divya Oberoi, Ayan Biswas
In this work we study a class of recently discovered metrewave solar transients referred to as Weak Impulsive Narrowband Quiet Sun Emission \citep[WINQSEs,][]{mondal2020}. Their st…
Preparing for Solar and Heliospheric Science with the SKAO: An Indian Perspective
Divya Oberoi, Susanta Kumar Bisoi, K. Sasikumar Raja +4
The Square Kilometre Array Observatory (SKAO) is perhaps the most ambitious radio telescope envisaged yet. It will enable unprecedented studies of the Sun, the corona and the helio…
Tackling the Unique Challenges of Low-frequency Solar Polarimetry with the Square Kilometre Array Low Precursor: Pipeline Implementation
Devojyoti Kansabanik, Apurba Bera, Divya Oberoi +1
The dynamics and the structure of the solar corona are determined by its magnetic field. Measuring coronal magnetic fields is, however, extremely hard. The polarization of low-freq…
A novel algorithm for high fidelity spectro-polarimetric snapshot imaging of the low-frequency radio Sun using SKA-low precursor
Devojyoti Kansabanik, Divya Oberoi, Surajit Mondal
Magnetic field couples the solar interior to the solar atmosphere, known as the corona. The coronal magnetic field is one of the crucial parameters which determines the coronal str…
Tackling the Unique Challenges of Low-frequency Solar Polarimetry with the Square Kilometre Array Low Precursor: The Algorithm
Devojyoti Kansabanik, Divya Oberoi, Surajit Mondal
Coronal magnetic fields are well known to be one of the crucial parameters defining coronal physics and space weather. However, measuring the global coronal magnetic fields remains…
Robust absolute solar flux density calibration for the Murchison Widefield Array
Devojyoti Kansabanik, Surajit Mondal, Divya Oberoi +2
Sensitive radio instruments are optimized for observing faint astronomical sources, and usually need to attenuate the received signal when observing the Sun. There are only a handf…
A search for counterparts of quiet sun radio transients in extreme ultraviolet data
Surajit Mondal
Recently nonthermal radio transients from the quiet sun have been discovered and it has been hypothesised using rough calculations that they might be important for coronal heating.…