Launch Date:12.10.2011


Megha-Tropiques is an Indo-French Joint Satellite Mission for studying the water cycle and energy exchanges in the tropics. The main objective of this mission is to understand the life cycle of convective systems that influence the tropical weather and climate and their role in associated energy and moisture budget of the atmosphere in tropical regions.

Megha-Tropiques will provide scientific data on the contribution of the water cycle to the tropical atmosphere, with information on condensed water in clouds, water vapour in the atmosphere, precipitation, and evaporation. With its circular orbit inclined 20o to the equator, the Megha-Tropiques is a unique satellite for climate research that should also aid scientists seeking to refine prediction models.

Megha-Tropiques carried the following four payloads:

1. Microwave Analysis and Detection of Rain and Atmospheric Structures (MADRAS), an Imaging Radiometer developed jointly by CNES and ISRO

2. Sounder for Probing Vertical Profiles of Humidity (SAPHIR), from CNES

3. Scanner for Radiation Budget (ScaRaB), from CNES

4. Radio Occultation Sensor for Vertical Profiling of Temperature and Humidity (ROSA), procured from Italy

Mission Operational Remote Sensing
Orbit 866 km with an inclination of 20o to the equator
Orbit Inclination 20o
Lift-off Mass 998 kg
Orbit Period 101.91 minutes
Local Time of Equator crossing -
Repetitivity 3-8 times a day

MADRAS: 5 frequencies: 18.7, 23.8, 36.5 GHz – 40 km resolution, 89 GHz – 10 km resolution & 157 GHz – 6 km resolution, 1700 km swath

SAPHIRE: 6 Frequencies, 183.31 ± 0,2, 1.1, 2.8, 4.2, 6.8 and 11 GHz, 10 km resolution, 1705 km swath

ScaRaB: 4 Channels: 0.5-0.7  µm, 0.2-4.0  µm, 0.2-50  µm, 10.5-12.5 µm, 40 km resolution, 2242 km swath

ROSA: Processes the received GPS signal in both the L1 (1560 – 1590 MHz) and L2 (1212 – 1242 MHz) frequency bands, 16 dual-frequency channels in the ROSA receiver

Attitude and Orbit Control 3-axis stabilised with reaction wheels, gyros and star sensors, hydrazine based RCS
Power Solar Array generating 1180 W at End Of Life backed by 2 Ni-Cd batteries of 24 AH capacities each
Launch date October 12, 2011
Launch site SDSC SHAR Centre, Sriharikota, India
Launch vehicle PSLV – C18
Mission life Five Years (Nominal)
Orbital life In Service