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MEGHA-TROPIQUES
MEGHA-TROPIQUES Satellite
CHARACTERISTICS 
Mission studying the water cycle over the Tropics
Four instruments: MADRAS, SAPHIR, SCARAB and GPS receiver
Orbit at 867 km altitude with a 20° inclination above the equator.

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The french-indian MEGHA-TROPIQUES satellite is devoted to the atmospheric research. The data collected by the satellite will allow to improve our knowledge on the water cycle contribution to the climate dynamic in the tropical atmosphere and our understanding of the processes linked to the tropical convection. CNES and the Indian Space Research Organization (ISRO) will share joint responsibility for the satellite and science missions, with CNES acting as prime contractor for some of the instruments.

The launch from Sriharikota base, India, took place on October 12, 2011.

The basic principles of the MEGHA-TROPIQUES mission are to:

  • provide simultaneous measurements of several elements of the atmospheric water cycle: water vapour, clouds, condensed water in clouds, precipitation and evaporation,
  • measure the corresponding radiative budget at the top of the atmosphere,
  • ensure high temporal sampling in order to characterise the life cycle of the convective system and to obtain significant statistics.

MEGHA-TROPIQUES is a mini-satellite using an indian platform (IRS). Its payload is constituted of:

  • MADRAS: a microwave imager aimed mainly at studying precipitation and clouds properties,
  • SAPHIR: a 6 channels microwave radiometer for the retrieval of water vapour vertical profiles and horizontal distribution,
  • SCARAB: a radiometer devoted to the measurement of outgoing radiative fluxes at the top of the atmosphere.

First part of the first MADRAS image (9 bands) showing part of Saoudi Arabia and India. The quick looks were made from raw data: raw numeric data without instrument geometry correction (conic scanning)
First part of the first MADRAS image (9 bands)
showing part of Saoudi Arabia and India.
The quick looks were made from raw data:
raw numeric data without instrument
geometry correction (conical scanning)

Raw data on one orbit of MADRAS 89V channel (conical scanning)
Raw data on one orbit of MADRAS 89V channel (conical scanning)

Raw data from SAPHIR instrument channel 6 on one orbit (orbit 44). SAPHIR is a microwave sounder dedicated to produce humidity profiles of the atmosphere
Raw data from SAPHIR instrument channel 6 on one orbit (orbit 44). SAPHIR is a microwave sounder dedicated to produce humidity profiles of the atmosphere.


Latest Update 30/09/2013
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The water cycle in the atmosphere over the Tropics is a key element of Earth's climate (© CNES)
 
KEY EVENTS
September 24, 2013
The MADRAS instrument declared non-operational...
 
May 23-24, 2013
XCAL Meeting in Toulouse...
 
January 11, 2013
The access to SAPHIR and SCARAB data level 1A and 1A2 is now open to all users...
 
December 10, 2012
Annoncement to users: MADRAS STATUS and data dissemination...
 
November 5, 2012
Availability of MADRAS, SAPHIR and SCARAB instruments science data...
 
July 2012
The level 1 data "DUMP" kind from SAPHIR instrument are transmitted in routine...
 
December 2011
Cyclone Thane seen by SAPHIR and MADRAS instruments
 
December 2011
SCARAB images after geometry correction
 
November 2011
MADRAS and SAPHIR images after geometry correction