A5052519164- Luminescence Properties of Advanced Materials
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Radiation Detection and Scintillator Technologies
- Astrophysics and Star Formation Studies
- Climate variability and models
- Solid-state spectroscopy and crystallography
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Meteorological Phenomena and Simulations
- Planetary Science and Exploration
- Glass properties and applications
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Tropical and Extratropical Cyclones Research
- Precipitation Measurement and Analysis
- Nuclear Physics and Applications
- Radiation Effects and Dosimetry
- Adaptive optics and wavefront sensing
- Ammonia Synthesis and Nitrogen Reduction
- Advanced Chemical Sensor Technologies
- SAS software applications and methods
- Geophysics and Gravity Measurements
- Lanthanide and Transition Metal Complexes
- Inorganic Fluorides and Related Compounds
Indian Institute of Astrophysics
2013-2023
Bjerknes Centre for Climate Research
2014-2020
University of Bergen
2017-2020
University of Colorado Boulder
2017
Bhabha Atomic Research Centre
2007-2016
Uni Research (Norway)
2016
Bhabha Atomic Research Center Hospital
2007-2015
Maharaja Sayajirao University of Baroda
2014
Nanyang Technological University
2008-2012
Instituto de Astrofísica de Andalucía
2007
Abstract The climatological features of the diurnal cycle and its spatial temporal variability are investigated around Himalayas using hourly, 0.05° × grid, near-surface rainfall data from Precipitation Radar (PR) aboard Tropical Rainfall Measuring Mission (TRMM) satellite during June–July–August (JJA) 1998–2002. Though sampling errors inherent to TRMM PR measurements could influence results, PR-observed precipitation show agreement with previous studies in this region. analysis...
Earth- and space-based observations provide synergistic information for space mission encounters by providing data over longer timescales, at different wavelengths using techniques that are impossible with an in situ flyby. We report here such support of the EPOXI spacecraft flyby comet 103P/Hartley 2. The nucleus is small dark, exhibited a very rapidly changing rotation period. Prior to onset activity, period was ∼16.4 hr. Starting 2010 August changed from 16.6 hr near 19 December. With...
Principal component analysis (PCA) is able to diagnose the diurnal rain cycle in Maritime Continent into two modes that explain most of variability region. The first mode results from differential variation potential instability forced by surface heat flux, insolation, and longwave radiative cooling on land sea. second associated with intrinsic mesoscale dynamics convective systems its interactions gravity waves, density currents, local circulations coastal regions or mountainous terrain....
Main belt asteroid (300163) 2006 VW139 (later designated P/2006 VW139) was discovered to exhibit comet-like activity by the Pan-STARRS1 survey telescope using automated point-spread-function analyses performed PS1's Moving Object Processing System. Deep follow-up observations show both a short (\sim 10") antisolar dust tail and longer 60") trail aligned with object's orbit plane, similar morphology observed for another main-belt comet, P/2010 R2 (La Sagra), other well-established comets,...
 The polar regions are among the most affected by global warming, making them particularly vulnerable to extreme events with significant impacts on cryosphere, permafrost, and wildfires. Record-breaking temperature precipitation extremes becoming increasingly widespread intense globally.  Extreme heat projected increase in frequency, intensity, duration throughout 21st century. Furthermore, a sea-ice-free Arctic is probable scenario. This raises critical questions...
Emission-line stars in young open clusters are identified to study their properties, as a function of age, spectral type and evolutionary state. 207 star were observed using the slitless spectroscopy method 157 emission 42 clusters. We have found 54 new emission-line 24 clusters, out which 19 house for first time. About 20 per cent harbour stars. The fraction housing is maximum both 0–10 20–30 Myr age bin (∼40 each). Most our survey belong Classical Be class (∼92 cent) while few Herbig (∼6...
We present results on the star-formation activity of an optically obscured region containing embedded cluster (S255-IR) and molecular gas between two evolved HII regions S255 S257. have studied complex using optical, near-infrared (NIR) imaging, optical spectroscopy radio continnum mapping at 15 GHz, along with Spitzer-IRAC results. It is found that main exciting sources S257 compact associated S255-IR are O9.5 - B3 V nature, consistent previous observations. Our NIR observations reveal 109...
A suite of numerical weather prediction (NWP) verification diagnostics applicable to both scalar and vector variables is developed, highlighting the normalization successive decomposition model errors. The normalized root‐mean square error (NRMSE) broken down into contributions from bias (NBias) pattern (NPE). NPE, or variance α , further analyzed phase amplitude errors, measured respectively by correlation similarity. similarity diagnostic introduced verify variability e.g. under different...
Context. In about 2000, the south pole of Triton experienced an extreme summer solstice that occurs every ∼650 years, when subsolar latitude reached 50°S. Bracketing this epoch, a few occultations probed atmosphere in 1989, 1995, 1997, 2008, and 2017. A recent ground-based stellar occultation observed on 6 October 2022 provides new measurement atmospheric pressure Triton. This is presented here. Aims. The goal to constrain volatile transport models (VTMs) atmosphere. basically vapor...
The precipitation variability and circulation characteristics around the Himalayas are examined using Tropical Rainfall Measuring Mission (TRMM) data, Global Energy Water Cycle Experiment (GEWEX) Asian Monsoon (GAME) reanalysis, National Centers for Environmental Prediction–National Center Atmospheric Research (NCEP‐NCAR) some of Indian radiosonde data sets. observation by radar on board TRMM satellite reveals an afternoon maximum during premonsoon season midnight–early morning summer...
This study presents a characteristic intermonsoon weather situation over the Malay Peninsula. The Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS) is used to investigate mesoscale details of simulated sea breeze circulations Peninsula on 23 April 2002. occurrence collisions occurring in inland region southern noted. On peninsula‐scale, convection was first initiated along low‐level convergence line that became established west coastal early afternoon. Deep clouds led...
We present a detailed study of V899 Mon (a new member in the FUors/EXors family young low-mass stars undergoing outburst), based on our long-term monitoring source starting from 2009 November to 2015 April. Our optical and near-infrared photometric spectroscopic recorded transitioning its first outburst short-duration quiescence phase (<1 yr), then returning second outburst. report here evolution outflows inner region disk as accretion rate evolved various epochs. high-resolution (R ∼...
Bright-rimmed clouds (BRCs), illuminated and shaped by nearby OB stars, are potential sites of recent/ongoing star formation. Here we present an optical infrared photometric study three BRCs: BRC 5, 7 39 to obtain a census the young stellar population, thereby inferring formation scenario, in these regions. In each BRC, Class I sources found be located mostly near bright rim or inside cloud, whereas II preferentially outside, with younger closer rim. This provides strong support sequential...
The characteristics of diurnal precipitation variability are evaluated over the tropical Maritime Continent (MC) from both satellite observations and high-resolution simulations performed using Weather Research Forecasting (WRF) model. Simulations Kain-Fritsch convective scheme showed a slight improvement in representing cycle compared with those other two schemes examined here. influence boundary forcing was between National Center for Environmental Prediction-Final Analysis (NCEP-FNL)...
A highly sensitive and tissue equivalent LiF:Mg,Cu,P thermoluminescent (TL) phosphor in powder form has been developed. The TL sensitivity of this is about 1.5 times that Harshaw-Bicron (TLD100-H) by peak height measurements. Its dose against response linear up to 10 Gy. annealing temperature was found affect the glow curve shape sensitivity.
Abstract We present UBVIc CCD photometry of the young open cluster Stock 8 with aim studying its basic properties such as amount interstellar extinction, distance, age, stellar contents and initial mass function (IMF). also studied star formation scenario in this region. From optical data, radius is found to be ∼6 arcmin (∼3.6 pc) reddening within region varies from E(B−V) = 0.40 0.60 mag. The located at a distance 2.05 ± 0.10 kpc. Using Hα slitless spectroscopy Two Micron All Sky Survey...