News and Events

Latest related research news

Read the latest on research by Megha-Tropiques scientists, announcements of meetings and other events that Megha-Tropiques scientists are participating in on the Megha-Tropiques Science Team web site.


Public release of Megha-Tropiques
Surface Accumulated Rainfall – May 2017 – Update March 2018


Update of previous highlight posted in May 2017: The TAPEER-BRAIN product is now available until December 14, 2017. Please note that this product is available in the MULTI_SENSOR section of the archive.
We are pleased to announce the release of the daily cumulated surface rainfall products and associated uncertainties. This so-called TAPEER-BRAIN product is available for the period from October 2011 till end of December 2016 at the resolution of 1°/1day, and are archived at the AERIS/ICARE data center.
To access the data, users must register. Registered users can access the data through the Archive Web Interface and the FTP server. See the Data Access section for details on access procedures and data policy.
Click here to access the data from the ICARE archive interface (current version: v1.00).
Click here to access the archive using FTP.

Release of Level-2 Geostationary Cloud Products
August 2016

Cloud type classification for 4 geostationary sensors - Image credit: NOAA/SATMOS/JMA/IPSL/ICARE

AERIS/ICARE Data and Services Center is pleased to announce the public release of cloud products derived from geostationary sensors in collaboration with Meteo-France/CMS/SATMOS and the Megha-Tropiques Science Team. The products (cloud mask, cloud type and cloud top pressure) are available over the period beginning with the Megha-Tropiques mission launch in October 2011 until present. This cloud information obtained at the highest spatial and temporal scale available is an important complement to the Megha-Tropiques mission, which aims at describing the radiative flux, the humidity profiles, and rain fields associated with tropical convection at a high temporal resolution.
Those cloud products are produced using an extended version of the SAFNWC (Satellite Application Facility for NowCasting) algorithm originally developed for SEVIRI by Derrien and Le Gleau (2005, 2010) and adapted to other geostationary data sets (Sèze et al. 2015).
For more information about products and data access, see the Megha-Tropiques 'Products' page (SAFNWC and GEOCLD section).

Public release of Megha-Tropiques/SAPHIR
Relative Humidity profiles products – July 2015


The French Megha-Tropiques science team is pleased to announce the public release of the layer-averaged relative humidity profiles (L2-RH) derived from the SAPHIR instrument. This new Level-2 product is available from the start of the mission (October 2011) until present. (click here to access the data from the ICARE archive interface (current version: v1.00).
The SAPHIR relative humidity profiles are produced for 6 altitude layers: 100-200hPa, 250-350hPa, 400-600hPa, 650-700hPa, 750-800hPa and 850-950hPa. The retrieval scheme named ARPIA ("Atmospheric Relative humidity profile Including the Analysis of confidence intervals") provides an estimate of the mean RH as well as its standard deviation interpreted as the 1-sigma confidence interval. ARPIA considers cloud-free and cloudy conditions, oceanic and continental scenes. Known limitations are for icy layers on top of convective clouds and for precipitating conditions, which are filtered out using the Hong et al. (2005) threshold method adapted for SAPHIR channels.
The details of the method will be soon available in a peer-reviewed paper.

Second announcement and call for abstracts
International conference on “Water and Energy cycles in the Tropics”
17-19 November 2015, Paris, France
Deadline for abstract submission extended to June 19


The aim of the conference is to provide a forum to review and discuss the latest research on the topic of the water and energy cycles with emphasis on tropical regions. The tropical energy cycles are central to the climate, its variability and its future evolution as reflected in the WCRP Grand Challenges being led by both the GEWEX program and the WGCM. The dynamical nature of the tropical water cycle and the control on the energy balance on both the tropical atmospheric dynamics and water cycle is one of the main incentives of the conference.
The deadline for abstract submission is June 15, 2015 (extended to June 19).

Public release of Megha-Tropiques SAPHIR and ScaRaB Level-2 products
Update on Level-1 products and MADRAS status
October 2013

Megha-Tropiques SAPHIR and ScaRaB Level-2 products are now freely available to all registered users through the ICARE Archive Web Interface and FTP server. Level-2 products were produced from the beginning of the mission in late 2011 to present. Three products are available:
  • SAPHIR L2-UTH: Upper Tropospheric Relative Humidity from SAPHIR
  • ScaRaB L2-FLUX: Top-of-the-Atmosphere shortwave and longwave unfiltered Radiances, Flux and Albedo products
  • ScaRaB L2B-FLUX: 1-degree gridded version of the L2-FLUX shortwave and longwave Flux and Albedo products
The French mission group is working on the future release of precipitation products.

Concerning the Level-1 products, the mission group has decided that orbit-wise products require further evaluation and should no longer be distributed to the public until further notice. The segment-wise Level-1 products are available in version 1.06.

Concerning MADRAS, ISRO and CNES announced in a joint communiqué in September 2013 that the MADRAS instrument has been declared non-operational. As of January 26, 2013, MADRAS Level-1 data is not valid and will not be disseminated to users. The 16-month archive of valid data (from launch to January 26, 2013) are currently restricted to the Science Team members and to other accredited users. MADRAS data are expected to be released in 2014.

Browse interface for Megha-Tropiques SAPHIR and ScaRaB products now available – May 2013


Megha-Tropiques browse imagery associated with SAPHIR and ScaRaB "Orbit" L1A2 products is now available. Images are available through a dedicated web interface:

Public release of Megha-Tropiques SAPHIR and ScaRaB
Level-1A and Level-1A2 data – January 2013


ISRO and CNES have announced the public release of Level-1A and Level-1A2 products of Megha-Tropiques SAPHIR and ScaRaB. Version v1.05 of these data are routinely transmitted to ICARE since January 24, 2013 and are available as "orbit-wise" as well as "segment-wise". This new version includes the latest calibration revisions for both sensors and is currently under evaluation.
Although earlier versions (v1.02, v1.03, v1.04) are also available from the beginning of the mission (from October 13, 2011), they are based on interim radiometric and geometric calibrations and should be used with caution and primarily for qualitative use.

Data release announcement
Megha-Tropiques SAPHIR Level-1 data now available
July 2012

Starting July 6, 2012, SAPHIR Level-1 data (MT1SAPSL1A "dump-wise" products) are routinely transmitted to the ICARE Data and Services Center from the Indian mission center ISSDC. The software used to produce the Level-1 data has been validated by CNES and ISRO. In accordance with the agreement signed by CNES and ISRO, access to these early data sets is restricted to the French and Indian mission teams and to scientists selected through the 2009 Megha-Tropiques International announcement of opportunity during a 6-month period. During this period, CNES, ISRO and the science team will continue their calibration and validation effort. So far the products are provisional and the calibration (radiometric and geometric) is only tentative.

CNES processes ScaRab data acquired onboard Megha-Tropiques satellite
December 2011

Image credit: CNES

CNES has processed the ScaRaB 4 channels to generate an example of level 1A geolocated data in the solar and thermal channels. ScaRaB (Scanner for Radiation Budget) is a broadband radiometer to measure shortwave and longwave outgoing fluxes at the top of the atmosphere and is one of the 3 radiometric instruments onboard the Megha-Tropiques satellite. The image shows one orbit of light reflected or emitted by the Earth and the atmosphere, passing over (from left to right) the Arabian Peninsula, the Arabian Sea, India, Malaysia, followed by night time data, then Eastern Africa and back again to the Arabian Peninsula.

Photo credit: CNES

Megha-Tropiques satellite acquires first MADRAS and SAPHIR images on October 25, 2011

The MADRAS and SAPHIR instruments onboard the Megha-Tropiques satellite have captured their first image on October 15, 2011. The CNES has processed the MADRAS 9 channels and SAPHIR 6 channels to generate geolocated brightness temperature on one orbit.

This image is an example taken by the MADRAS instrument (Microwave Analysis and Detection of Rain and Atmospheric Structures). It shows one orbit of brightness temperature passing over Central Africa, Northern Australia, and Central America.