PSLV-C18 to put four satellites in orbit

PSLV C-18

• 20th PSLV to be launched.
• is the core-alone version of the four-stage PSLV.
• without the strap-on booster motors that will put the four satellites in orbit 
•  will put four satellites in the orbit.

The four satellites which it shall put on orbit are

(A)  Megha-Tropiques

• built by India (ISRO) and France (CNES)
• to understand global tropical weather and climate
• will help understand the behaviour of Indian monsoons and occurrence of cyclones, floods and droughts.
• Megha in Sanskrit means cloud and Tropiques in French is tropics
•  one of the most advanced and complex satellites built to monitor the weather in the short-term and climate in the long-term in the tropical regions of the world.
• at an altitude of 867 km,the rapidly developing weather systems in the entire tropical world could kept an eye on. Thus, the information beamed by the Megha-Tropiques will be useful not only to India but to all the countries in the Indian Ocean region and other parts of the world.
•  has four scientific payloads

1. Microwave Analysis and Detection of Rain and Atmospheric Structures (MADRAS), ---(built by ISRO and the CNES, will provide an estimation of rainfall, water vapour, liquid water, ice and surface wind) .
2. Scanner for Radiative Budget (SCARAB)--- (built by CNES,will study the radiation received by the earth and reflected by it.)                                                                                             
3. Sondeur Atmospherique du Profil d'humidite Intertropicale par Radiometrie (SAPHIR) ---(built by CNES , will investigate the humidity present in the tropical atmosphere.)
4.  GPS-ROS (Global Positioning System- Radio Occultation System) --- Italy will study the temperature and humidity at different altitudes.

Integration of entire satellite done by  ISRO Satellite Centre, Bangalore

(B) SRM Satwill

• 10-kg 
•  help in understanding global warming and pollution by studying carbon-dioxide and carbon-monoxide present in the atmosphere. 
•  built by the students of SRM University, near Chennai

(C)  Jugnu 

•  three-kg 
• has a camera to take pictures of the earth to monitor, vegetation, reservoirs, lakes, and ponds.
•  integrated by students of the Indian Institute of Technology (IIT)

(D)  VesselSat

• will help in locating the ships in the sea-lanes of the world.
•  from Luxembourg

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