BANGALORE: Indian Space Research Organisation (ISRO) is giving final touches for the launch of Megha- Tropiques, an Indo-French advanced tropical climate monitoring satellite, expected to be carried out from the Sriharikota spaceport in a couple of weeks.ISRO chairman K Radhakrishnan is slated to announce on Saturday the date for the launch of the joint mission of ISRO and French space agency CNES.Megha-Tropiques (Megha meaning cloud in Sanskrit and Tropiques denoting tropics in French), which would investigate the contribution of water cycle in the tropical atmosphere to climate dynamics, would be launched by ISRO’s workhorse rocket PSLV.Besides Megha-Tropiques, the PSLV will launch three nano satellites — one from Luxembourg, “Jugnu” research satellite designed by IIT-Kanpur and a third one to monitor greenhouse gases from SRM University, Chennai.A few days ago, Thales Alenia Space delivered to ISRO the flight model of the Radio Occultation Sounder for the Atmosphere (ROSA), which would be integrated into Megha-Tropiques.The ROSA instrument is composed of a GPS receiver and two dual frequency antennas to pick up signals through the atmosphere.Raw data measured by ROSA will be beamed back to Earth where the analysis of GPS signals crossing through the troposphere give a wealth of information.From that it is possible to determine the temperature, pressure and humidity of the atmosphere, and thus to issue forecasts on the evolution and motion of weather fronts to evaluate climatic trends, according to a Thales Alenia Space statement.It will also help in mapping the electron density as well as irregularities in the ionosphere in order to predict magnetic storms.“The radiooccultation method allows to achieve a better vertical resolution than other infrared or microwave sensors,” the statement added.ISRO would control the satellite in orbit and also receive, process and distribute the scientific data from it.
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