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Megha Tropiques Objectives

The main objective of the Megha-Tropiques mission is to study the convective systems that influence the tropical weather and climate. The Megha-Tropiques mission goals are as follows:

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

The payloads have swaths of around 1700-200km. It is necessary to measure the above parameters for a minimum duration of 3 years in order to observe the inter-annual variability and getting an opportunity to observe El Nino-type events in the tropics.

The satellite is launched into a non-sun synchronous orbit, unlike other IRS spacecraft. This Megha-Tropiques satellite carries four payloads namely, MADRAS-a microwave imager, SAPHIR-scanning radiometer instrument, SCARAB-scanner for radiative budget and GPS occultation receiver for atmospheric studies. The major orbit parameters are:

Altitude: 867 km, circular
Inclination: 20°
Period: 102.16 minutes
Repetitivity: 97 orbits in 7 days
No. of Orbits Per day: 14 (approx.)