Surajit Mondal
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View article: A Dedicated System for Coordinated Radio and Optical Monitoring of the Space Weather of Young, Solar-type Stars
A Dedicated System for Coordinated Radio and Optical Monitoring of the Space Weather of Young, Solar-type Stars Open
Low-frequency radio emission in the form of type II and III bursts is a direct indicator of plasma motion in the solar corona and interplanetary medium. However, detecting equivalent events on solar analogs requires thousands of observing …
View article: Enigmatic Centi-SFU and mSFU Nonthermal Radio Transients Detected in the Middle Corona
Enigmatic Centi-SFU and mSFU Nonthermal Radio Transients Detected in the Middle Corona Open
Decades of solar coronal observations have provided substantial evidence for accelerated particles in the corona. In most cases, the location of particle acceleration can be roughly identified by combining high spatial and temporal resolut…
View article: Possible First Detection of Gyroresonance Emission from a Coronal Mass Ejection in the Middle Corona
Possible First Detection of Gyroresonance Emission from a Coronal Mass Ejection in the Middle Corona Open
Routine measurements of the magnetic field of coronal mass ejections (CMEs) have been a key challenge in solar physics. Making such measurements is important both from a space weather perspective and for understanding the detailed evolutio…
View article: Probing the Turbulent Corona and Heliosphere Using Radio Spectral Imaging Observation during the Solar Conjunction of the Crab Nebula
Probing the Turbulent Corona and Heliosphere Using Radio Spectral Imaging Observation during the Solar Conjunction of the Crab Nebula Open
Measuring plasma parameters in the upper solar corona and inner heliosphere is challenging because of the region’s weakly emissive nature and inaccessibility for most in situ observations. Radio imaging of broadened and distorted backgroun…
View article: High energy cosmic ray detections with the standalone radio trigger system at the Owens Valley Radio Observatory Long Wavelength Array
High energy cosmic ray detections with the standalone radio trigger system at the Owens Valley Radio Observatory Long Wavelength Array Open
View article: Measuring the Magnetic Field of a Coronal Mass Ejection from the Low to Middle Corona
Measuring the Magnetic Field of a Coronal Mass Ejection from the Low to Middle Corona Open
A major challenge in understanding the initiation and evolution of coronal mass ejections (CMEs) is measuring the magnetic field of the magnetic flux ropes (MFRs) that drive CMEs. Recent developments in radio imaging spectroscopy have pave…
View article: Role of Nonthermal Processes in the Quiescent and Active Millimeter Spectrum of a Young M Dwarf
Role of Nonthermal Processes in the Quiescent and Active Millimeter Spectrum of a Young M Dwarf Open
Millimeter (mm) emission from F-M dwarfs (cool stars) primarily traces chromospheric activity, with thermal emission thought to dominate in quiescence. Despite the high chromospheric activity, the quiescent mm spectral fluence (mm- S ( ν )…
View article: First Robust Detection of Linear Polarization from Metric Solar Emissions: Challenging Established Paradigms
First Robust Detection of Linear Polarization from Metric Solar Emissions: Challenging Established Paradigms Open
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 at low radio frequencies have almost always assumed the abs…
View article: Observation and Modeling of Small Spatial Structures of Solar Radio Noise Storms Using the uGMRT
Observation and Modeling of Small Spatial Structures of Solar Radio Noise Storms Using the uGMRT Open
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 believed to be powered by the plasma emission mechanism. Si…
View article: Noise in Maps of the Sun at Radio Wavelengths I: Theoretical Considerations
Noise in Maps of the Sun at Radio Wavelengths I: Theoretical Considerations Open
View article: Noise in Maps of the Sun at Radio Wavelengths II: Solar Use Cases
Noise in Maps of the Sun at Radio Wavelengths II: Solar Use Cases Open
View article: Probing the Turbulent Corona and Heliosphere Using Radio Spectral Imaging Observation during the Solar Conjunction of Crab Nebula
Probing the Turbulent Corona and Heliosphere Using Radio Spectral Imaging Observation during the Solar Conjunction of Crab Nebula Open
Measuring plasma parameters in the upper solar corona and inner heliosphere is challenging because of the region's weakly emissive nature and inaccessibility for most in situ observations. Radio imaging of broadened and distorted backgroun…
View article: Implementing Continuous All-sky Monitoring with the OVRO-LWA to Identify Prompt and Precursor Counterparts of Gravitational Wave Events
Implementing Continuous All-sky Monitoring with the OVRO-LWA to Identify Prompt and Precursor Counterparts of Gravitational Wave Events Open
A number of theoretical studies have proposed a prompt or precursor low-frequency radio counterpart to gravitational wave events detected by LIGO and Virgo. Detection of such events would offer a new window on the immediate environment of …
View article: A Formalism for Calibrating the Instrumental Polarization of Radio Interferometric Arrays at Meter Wavelengths Using Unpolarized Sky: A Demonstration Using MWA Observations
A Formalism for Calibrating the Instrumental Polarization of Radio Interferometric Arrays at Meter Wavelengths Using Unpolarized Sky: A Demonstration Using MWA Observations Open
Calibration of instrumental polarization is critical for measuring polarized radio emissions from astrophysical sources to extract the magnetic field information in astrophysical, heliospheric, and terrestrial plasmas. At meter wavelengths…
View article: Author Correction: IoT-based automated system for water-related disease prediction
Author Correction: IoT-based automated system for water-related disease prediction Open
View article: IoT-based automated system for water-related disease prediction
IoT-based automated system for water-related disease prediction Open
View article: New Insights into Type-I Solar Noise Storms from High Angular Resolution Spectroscopic Imaging with the Upgraded Giant Metrewave Radio Telescope
New Insights into Type-I Solar Noise Storms from High Angular Resolution Spectroscopic Imaging with the Upgraded Giant Metrewave Radio Telescope Open
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 background with superposed islands of much brighter narrowband…
View article: CME-associated type-IV radio bursts: The solar paradigm and the unique case of AD Leo
CME-associated type-IV radio bursts: The solar paradigm and the unique case of AD Leo Open
The type-IV bursts, associated with coronal mass ejections (CMEs), occasionally extend to the decameter-hectrometric (DH) range. We present a comprehensive catalog of simultaneous multi-vantage point observations of DH type-IV bursts by Wi…
View article: New Insights into Type-I Solar Noise Storms from High Angular Resolution Spectroscopic Imaging with the Upgraded Giant Metrewave Radio Telescope
New Insights into Type-I Solar Noise Storms from High Angular Resolution Spectroscopic Imaging with the Upgraded Giant Metrewave Radio Telescope Open
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 background with superposed islands of much brighter narrowband…
View article: Spectropolarimetric Radio Imaging of Faint Gyrosynchrotron Emission from a CME: A Possible Indication of the Insufficiency of Homogeneous Models
Spectropolarimetric Radio Imaging of Faint Gyrosynchrotron Emission from a CME: A Possible Indication of the Insufficiency of Homogeneous Models Open
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 technique to measure the CME magnetic field at coronal heights…
View article: A Joint Microwave and Hard X-Ray Study toward Understanding the Transport of Accelerated Electrons During an Eruptive Solar Flare
A Joint Microwave and Hard X-Ray Study toward Understanding the Transport of Accelerated Electrons During an Eruptive Solar Flare Open
The standard flare model, despite its success, is limited in comprehensively explaining the various processes involving nonthermal particles. One such missing ingredient is a detailed understanding of the various processes involved during …
View article: A Joint Microwave and Hard X-Ray Study Towards Understanding the Transport of Accelerated Electrons during an Eruptive Solar Flare
A Joint Microwave and Hard X-Ray Study Towards Understanding the Transport of Accelerated Electrons during an Eruptive Solar Flare Open
The standard flare model, despite its success, is limited in comprehensively explaining the various processes involving nonthermal particles. One such missing ingredient is a detailed understanding of the various processes involved during …
View article: First robust detection of linear polarization from solar radio bursts
First robust detection of linear polarization from solar radio bursts Open
For decades, the focus of polarimetric solar radio studies has been solely on circular polarization. This stemmed from the fact that the strong differential Faraday rotation in coronal plasma should completely obliterate any linear polariz…
View article: Toward Commissioning Solar Observations with MeerKAT: Opening a New Frontier in Solar Radio Physics
Toward Commissioning Solar Observations with MeerKAT: Opening a New Frontier in Solar Radio Physics Open
Solar radio emissions provide several unique diagnostics tools of the solar corona, which are otherwise inaccessible. However, imaging the very dynamic coronal emissions spanning a large range of angular scales at radio wavelengths is extr…
View article: Detection of long-lasting aurora-like radio emission above a sunspot
Detection of long-lasting aurora-like radio emission above a sunspot Open
We present our findings on long-lasting radio emissions above a sunspot, analogous to planetary auroral radio emissions. These emissions are typically characterized by highly polarized, intense radio bursts, generally attributed to electro…
View article: Measuring Magnetic Fields of Coronal Mass Ejection in Corona and Inner Heliosphere using Wide Field of View Spectro-polarimetric Radio Imaging
Measuring Magnetic Fields of Coronal Mass Ejection in Corona and Inner Heliosphere using Wide Field of View Spectro-polarimetric Radio Imaging Open
Coronal mass ejections (CMEs) are the strongest drivers of space weather. Measurements of the plasma parameters of CMEs, particularly magnetic fields entrained in the CME plasma, are crucial to understand their propagation, evolution, and …
View article: Energetic particle activity in AD Leo: Detection of a solar-like type-IV burst
Energetic particle activity in AD Leo: Detection of a solar-like type-IV burst Open
Context . AD Leo is a young and active M dwarf with high flaring rates across the X-ray-to-radio bands. Flares accelerate particles in the outer coronal layers and often impact exo-space weather. Wide-band radio dynamic spectra let us expl…
View article: An Analysis into the Factors Affecting Online Customers’ Satisfaction: A Developing Country Perspective
An Analysis into the Factors Affecting Online Customers’ Satisfaction: A Developing Country Perspective Open
This article investigates the factors that affect online customers’ satisfaction from the perspective of Bangladesh. The study is a descriptive type of research. Data have been collected from 201 respondents who make online purchasing, usi…
View article: Spectroscopic Imaging of the Sun with MeerKAT: Opening a New Frontier in Solar Physics
Spectroscopic Imaging of the Sun with MeerKAT: Opening a New Frontier in Solar Physics Open
Solar radio emissions provide several unique diagnostics to estimate different physical parameters of the solar corona, which are otherwise simply inaccessible. However, imaging the highly dynamic solar coronal emissions spanning a large r…
View article: Detection of long-lasting aurora-like radio emission above a sunspot
Detection of long-lasting aurora-like radio emission above a sunspot Open
Auroral radio emissions in planetary magnetospheres typically feature highly polarized, intense radio bursts, usually attributed to electron cyclotron maser (ECM) emission from energetic electrons in the planetary polar region that feature…