A5101984177- Meteorological Phenomena and Simulations
- Ionosphere and magnetosphere dynamics
- Precipitation Measurement and Analysis
- Ocean Waves and Remote Sensing
- Climate variability and models
- Soil Moisture and Remote Sensing
- Atmospheric aerosols and clouds
- Aeolian processes and effects
- Energy Harvesting in Wireless Networks
- Direction-of-Arrival Estimation Techniques
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Wireless Body Area Networks
- Radio Wave Propagation Studies
- Antenna Design and Analysis
- GNSS positioning and interference
- Tropical and Extratropical Cyclones Research
- Solar and Space Plasma Dynamics
National Atmospheric Research Laboratory
2010-2021
Indian Space Research Organisation
2012-2014
Abstract. High-resolution radiosondes and calibrated radars operating close to 50 MHz, are used examine the relationship between strength of radar scatter refractive index gradient. Three used, in Kiruna Arctic Sweden, at Gadanki southern India Swedish/Finnish base Wasa/Aboa Queen Maud Land, Antarctica. Calibration is accomplished using daily variation galactic noise measured each site. Proportionality square mean gradient potential index, M2, found upper troposphere lower stratosphere all...
This paper describes an automated data processing algorithm to identify the turbulence echo in multipeaked very high-frequency radar spectra, generally observed during precipitation. Although a few multipeak-picking algorithms exist, they from clutter and noise, but do not distinguish precipitation echoes. The present identifies multiple peaks based on several criteria, such as significance of echoes, separation between echoes within sliding window, reference echo. A new method [symmetric...
Abstract. Coordinated measurements of Indian MST radar and radiosonde during the passage overshooting convective cores in SAFAR pilot campaign (May–November 2008) are utilized to quantify mass flux across tropopause strength turbulence up- down-draft cores. The distribution retrieved is found be wide, ranging from −0.6 (downward flux) 0.8 kg m−2 s−1 (upward flux). net flux, is, however, troposphere stratosphere, spite existence significant amount downward flux. For first time, vicinity...
The turbulent kinetic energy (TKE) per unit mass estimated from the spectral width of very high frequency/ultra frequency (VHF/UHF) radars often produce unrealistic negative values, particularly in presence strong winds, due to excess correction nonturbulent factors. An experiment has been conducted with newly acquired capabilities Advanced Indian MST Radar (AIR), which several antenna configurations, providing different beamwidths, have employed evaluate various existing theoretical...
The middle and upper atmospheric (MU) radar at Shigaraki, Japan, is an excellent system to carry out observation using a spaced antenna (SA) technique. Over several years, numerous scientific studies were reported SAs. In most of the studies, SA used derive wind information, array divided in three segments grouped with or six channels obtain baselines form equilateral triangle. previous work, had been estimated by up maximum height 10-14 km. general, SA-based estimation could not give good...
Abstract. In November 2008 and in March April 2009 the Indian MST radar (53 MHz) at Gadanki was operated during daytime a special experiment, with 600 m altitude resolution, for understanding characteristics of low-latitude mesospheric echoes (LLME). The data three days when were strongest have been analysed terms spectral widths volume reflectivities. Spectral LLME show some decrease altitude, median values 4–6 s−1 69–72 km 2–4 73–78 km. This corresponds to 20–200 mW kg−1 turbulent energy...
Abstract Newly acquired multi‐receiver capability of Advanced Indian MST radar has been utilized to implement the spaced antenna (SA) technique for profiling winds and turbulence. Two experiments were conducted. In Experiment 1, in addition traditional Full Correlation Analysis (FCA), SA analysis is also performed on off‐vertical beam measurements (hereafter Oblique Spaced Antenna [OSA]) products are evaluated against those retrieved with Doppler Beam Swinging (DBS) collocated GPS...