M. Rameez
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View article: Latest findings on large-scale cosmic ray anisotropy from the GRAPES-3 experiment
Latest findings on large-scale cosmic ray anisotropy from the GRAPES-3 experiment Open
View article: Searches for Gamma Ray sources with GRAPES-3
Searches for Gamma Ray sources with GRAPES-3 Open
View article: <i>Colloquium</i> : The cosmic dipole anomaly
<i>Colloquium</i> : The cosmic dipole anomaly Open
International audience
View article: Enhancing the capability through Recycling: Doubling the World's Largest Muon Telescope with almost-buried Iron tubes
Enhancing the capability through Recycling: Doubling the World's Largest Muon Telescope with almost-buried Iron tubes Open
The GRAPES-3 experiment, housing the world's largest muon telescope at 2200 m above sea level in Ooty, is designed to study cosmic-ray effects on Earth. To double the telescope's capability, we have refurbished nearly the same number of pr…
View article: Anisotropy in Pantheon+ supernovae
Anisotropy in Pantheon+ supernovae Open
We employ maximum likelihood estimators to examine the Pantheon+ catalogue of Type Ia supernovae for large scale anisotropies in the expansion rate of the Universe. The analyses are carried out in the heliocentric frame, the CMB frame, as …
View article: Colloquium: The Cosmic Dipole Anomaly
Colloquium: The Cosmic Dipole Anomaly Open
The Cosmological Principle, which states that the Universe is homogeneous and isotropic (when averaged on large scales), is the foundational assumption of Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmologies such as the current standard …
View article: An automated algorithmic method to mitigate long-term variations in the efficiency of the GRAPES-3 muon telescope
An automated algorithmic method to mitigate long-term variations in the efficiency of the GRAPES-3 muon telescope Open
The GRAPES-3 large area muon telescope with its sixteen independent modules records the high energy (>1 GeV) muons continuously over 2.3 sr of the sky. However, the recorded muon rates are contaminated by instrumental effects and instabili…
View article: Enhancing Diagnostic Accuracy for Knee Osteoarthritis Using a Deep Learning Approach
Enhancing Diagnostic Accuracy for Knee Osteoarthritis Using a Deep Learning Approach Open
This research introduces a deep learning framework that combines convolutional neural networks with autoencoders to improve the diagnostic accuracy of knee osteoarthritis. The study utilized a publicly available dataset from the Mendeley D…
View article: Forty years of the Ellis–Baldwin test
Forty years of the Ellis–Baldwin test Open
View article: Variation of refractive indices in self-assembling honeycomb patterned PMMA films
Variation of refractive indices in self-assembling honeycomb patterned PMMA films Open
A novel solvent casting method for poly methyl methylacrylate (PMMA) thin films which allows for morphology and refractive index manipulation is presented in this work.
View article: Dependence of the estimated electric potential in thunderstorms observed at GRAPES-3 on the hadronic interaction generators used in simulations
Dependence of the estimated electric potential in thunderstorms observed at GRAPES-3 on the hadronic interaction generators used in simulations Open
A potential difference of 1.3 Giga-Volts (GV) was inferred across a thundercloud using data from the GRAPES-3 muon telescope (G3MT) [1]. This was the first-ever estimation of gigavolt potential in thunderstorms, confirming prediction of C.…
View article: Anisotropy in the cosmic acceleration inferred from supernovae
Anisotropy in the cosmic acceleration inferred from supernovae Open
Under the assumption that they are standard(isable) candles, the lightcurves of Type Ia supernovae have been analyzed in the framework of the standard Friedmann-Lemaître-Robertson-Walker cosmology to conclude that the expansion rate of the…
View article: Anisotropy in Pantheon+ supernovae
Anisotropy in Pantheon+ supernovae Open
We employ Maximum Likelihood Estimators to examine the Pantheon+ catalogue of Type Ia supernovae for large scale anisotropies in the expansion rate of the Universe. The analyses are carried out in the heliocentric frame, the CMB frame, as …
View article: Cosmological Inference from within the Peculiar Local Universe
Cosmological Inference from within the Peculiar Local Universe Open
The existence of ‘peculiar’ velocities due to the formation of cosmic structure marks a point of discord between the real universe and the usually assumed Friedmann–Lemaítre–Robertson–Walker metric, which accomodates only the smooth Hubble…
View article: Probing neutrino interactions and properties with IceCube
Probing neutrino interactions and properties with IceCube Open
Instrumenting a cubic kilometre of ice at the South Pole, the IceCube neutrino observatory has confirmed the existence of a diffuse flux of astrophysical neutrinos at TeV-PeV energies, opening a new window to the cosmos. This flux, along w…
View article: Probing atmospheric effects using GRAPES-3 plastic scintillator detectors
Probing atmospheric effects using GRAPES-3 plastic scintillator detectors Open
The GRAPES-3 extensive air shower (EAS) array has been designed to study cosmic rays from 10 $$^{13}$$ –10 $$^{16}$$ eV. It employs 400 scintillator detectors spread across 25,000 m $$^{2}$$ , mainly of cone-type and fiber-type, e…
View article: Small-scale Cosmic-Ray Anisotropy Observed by the GRAPES-3 Experiment at TeV Energies
Small-scale Cosmic-Ray Anisotropy Observed by the GRAPES-3 Experiment at TeV Energies Open
GRAPES-3 is a mid-altitude (2200 m) and near-equatorial (11.°4N) air shower array, overlapping in its field of view for cosmic-ray observations with experiments that are located in the Northern and Southern Hemispheres. We analyze a sample…
View article: Small-scale cosmic ray anisotropy observed by the GRAPES-3 experiment at TeV energies
Small-scale cosmic ray anisotropy observed by the GRAPES-3 experiment at TeV energies Open
GRAPES-3 is a mid-altitude (2200 m) and near equatorial ($11.4^{\circ}$ North) air shower array, overlapping in its field of view for cosmic ray observations with experiments that are located in Northern and Southern hemispheres. We analyz…
View article: Updated results on the cosmic ray energy spectrum and composition from the GRAPES-3 experiment
Updated results on the cosmic ray energy spectrum and composition from the GRAPES-3 experiment Open
Here, we present the updated results on the cosmic ray energy spectrum and composition analysis from the GRAPES-3 experiment over the energy range of 50 TeV to 1000 TeV since ICRC 2021. The simulation of cosmic ray showers was performed us…
View article: Update on the angular resolution of GRAPES-3 experiment based on Moon shadow analysis
Update on the angular resolution of GRAPES-3 experiment based on Moon shadow analysis Open
GRAPES-3 is an extensive air shower array located at Ooty (11.6 ^\circ N, 76.7 ^\circ E, 2200 m a.s.l.) in southern India. Recently, the angular resolution of the GRAPES-3 array has been improved by correcting the shower front curvature …
View article: Highlights of the results from the GRAPES-3 experiment
Highlights of the results from the GRAPES-3 experiment Open
The GRAPES-3 experiment is a unique, extensive air shower experiment consisting of 400 scintillator detectors spread over 25000 m ^2 and a 560 m ^2 muon telescope. The experiment located at Ooty, India, has been collecting data for t…
View article: A simulation study of the GRAPES-3 sensitivity to primary cosmic ray composition with the expanded muon telescope
A simulation study of the GRAPES-3 sensitivity to primary cosmic ray composition with the expanded muon telescope Open
The GRAPES-3 extensive air shower consisting of a dense scintillator array and a 560 m square area tracking muon detector is designed to study the cosmic ray energy spectrum and composition over the knee region. Another muon telescope simi…
View article: Seasonal variation of thunderstorm-induced muon events observed at GRAPES-3
Seasonal variation of thunderstorm-induced muon events observed at GRAPES-3 Open
The thunderstorm-induced muon events (TIMEs) are observed when the strong electric fields in thunderstorms modulate muon acceleration, resulting in their altered count rate at the observational level. Because of the GRAPES-3 experiment’s r…
View article: The potential role of GRAPES-3 experiment in space weather forecasting
The potential role of GRAPES-3 experiment in space weather forecasting Open
On 22 June 2015, a massive coronal mass ejection triggered a strong G4 class geomagnetic storm upon arrival at Earth. This weakened the Earth’s magnetic shield by allowing the reconnection of the interplanetary magnetic field with the geom…
View article: A new approach to determine muon multiplicity at the GRAPES-3 experiment
A new approach to determine muon multiplicity at the GRAPES-3 experiment Open
The muon content in extensive air showers (EAS) is a sensitive observable for measuring the primary cosmic ray composition. An accurate determination of the muon multiplicity in an EAS is thus imperative for composition studies. The GRAPES…
View article: Small-scale anisotropy in the cosmic ray flux observed by GRAPES-3 at TeV energies
Small-scale anisotropy in the cosmic ray flux observed by GRAPES-3 at TeV energies Open
Cosmic ray (CR) anisotropy of several scales have been observed over the last decade by a number of experiments located in the Northern and Southern hemispheres. The GRAPES-3 experiment, located at $11.4^{\\circ}$ N can observe a significa…
View article: Contemplating the observed relationship between the global electric circuit and GRAPES-3 thunderstorm-induced muon events
Contemplating the observed relationship between the global electric circuit and GRAPES-3 thunderstorm-induced muon events Open
Thunderstorms, lightning, and the Global Electric Circuit (GEC) are interconnected, and their studies have significant implications for understanding the global climate. Solar insolation plays a role in linking lightning distribution to Ea…
View article: Cosmic ray proton energy spectrum below the Knee observed by the GRAPES-3 experiment
Cosmic ray proton energy spectrum below the Knee observed by the GRAPES-3 experiment Open
The GRAPES-3 experiment consists of a densely packed array of 400 plastic scintillator detectors and a large area (560 $m^{2}$) muon telescope. It measures cosmic rays in an energy range of several TeV to over 10 PeV with a trigger efficie…
View article: Search for point sources of gamma-rays above 50 TeV with the GRAPES-3 experiment.
Search for point sources of gamma-rays above 50 TeV with the GRAPES-3 experiment. Open
The GRAPES-3 is an extensive air shower array located in Ooty (11.4$^\circ$ N, 76.7$^\circ$ E), designed to study cosmic rays and gamma rays at TeV-PeV energies. The compact array of scintillator detectors coupled with a mid-latitude locat…
View article: Study of modulation cycles of cosmic ray diurnal anisotropy variation using 22 years of GRAPES-3 muon data
Study of modulation cycles of cosmic ray diurnal anisotropy variation using 22 years of GRAPES-3 muon data Open
The diurnal variations of the galactic cosmic rays (GCRs) measured by ground-based detectors represent an anisotropic flow of GCR at 1 AU, also known as solar diurnal anisotropy (SDA). The GRAPES-3 muon telescope (G3MT) has been recording …