Atmospheric Gravity Waves

Facility Main Webpage: Click Here

Guide: Dr. Ashik Paul (Calcutta University), Dr. Souvik Majumdar (Calcutta University)

Project Completed: May 2024

Project

We know the power of ST Radar which is used to probe Atmospheric and weather studies. These applications require the antenna to be used in active mode, where it illuminates the target with its own power source. We worked with the CU-ST Radar at Kalyani, West Bengal. An almost circular 475 Yagi-Uda Antenna Array at 53 MHz with a bandwidth of 3MHz which has a collecting area of 7000 m2.

We use this facility to detect and study Atmospheric Gravity Waves above the region during thunderstorms and monsoon.

Experiment 1: Active Mode operation of Radar for detection of Atmospheric Gravity Waves

We developed codes and algorithms for getting zonal, meridional and vertical wind components from power spectral data from Radar. Subsequently analyzing them for the presence of Atmospheric Gravity Wave.

We have received radar data from 25th May, 2023 and 22nd June, 2023 during incidents of heavy thunderstorm. We have obtained the wind velocity variation with height and time. And now we observe the wind oscillations of various components of the wind.

Codes and Software's created

CDP (CU-ST Radar Data Processor): CDP aims to assist in analysis of spectral data dumped by CU-STR and obtain various functionalities from it. Link to repo.
Gravity wave analysis code: Click here

Publications and Conferences:

Oral Presentation at 6th Conference on India Radar Meteorology (IRAD)-2024, with the title: Atmospheric Gravity Wave Signatures in the Lower Atmosphere over a Tropical Location observed using a VHF active-phased array ST Radar - Presented

Atmospheric Gravity Wave Signatures in the Lower Atmosphere over a Tropical Location observed using a VHF active-phased array ST Radar - Bachelor Thesis - (Click here).

Results will be communicated as a paper soon.

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