Solar Flares as seen by SMOS

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Dear SMOSers

Raúl Díez-García from the SMOS Calibration Expertise Centre at ESAC (Spain) tells us that last Wednesday (September 6th 2017) SMOS was able to observe the monster X9-class solar flare. Se below the Sun’s brightness temperatures of this event. At the maximum, it almost reaches 21 million Kelvin which is kind of hot!. He provided the following charts:

SolarFlare_X9_20170906SMOS observed temporal evolution of the Suns brightness temperatures during a solar flare (2017 09 06)

Find more details about the event here. I found it quite impressive!

But this event was followed by another one as the same sunspot erupted again last Sunday (September 10th 2017). It also was quite strong, being X8 class. See below the observed BT, more than 4 million Kelvin.

SolarFlare_X8_20170910SMOS observed temporal evolution of the Suns brightness temperatures during a solar flare (2017 09 10)

So if you are operating an L band radiometer double check your measurements for this period!

SMOS and Harvey

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As most of you are well aware the Hurricane Harvey Texas very recently showing that maybe climate change is not a joke.


<– Harvey (Image: NASA)

Harvey’s  forecasted trajectory (National Hurricane Center, National Oceanic And Atmospheric Administration) ^

SMOS monitored wind speed while Harvey was travelling in the Gulf of Mexico and then we have been able to monitor the flooding using SMOS NRT SM data  (Nemesio Rodriguez-Fernandez – CESBIO) as depicted in this animation from August 20 to August 31st (click to see animation)


NEW SMOS L4 products available on CATDS

Category : Non classé

We have released a few products related to land surfaces non CATDS (see here)
Products related to soil moisture and climate/ extreme events (see Al Bitar et al) namely:
1) L4_Root_Zone_ Soil_Moisture — a 1 m deep root zone soil moisture on SMOS grid for the period starting in January 2010
2) L4_Agricultural_Drought_Index – a drought index derived from 1 for the same period
Two products linked to making a long time series of soil moisture using SMOS data as a reference.
They were produced with AMSR-2 (and encompasses AMSR-2 life time) and directly match the SMOS L3 data giving almost 15 years of surface soil moisture. We will extend the temporal series in the  near future
3) L4_AMRS-E_SMOS_Soil_Moisture_using_Neural_Networks (Rodriguez Fernandez et al)
4) L4_AMRS-E_SMOS_Soil_Moisture_using_Multi-linear_Regression (Al-Yaari et al)
And finally a roughness map derived from SMOS DATA (Parrens et al)
5) L4_Surface_Roughness_map
Enjoy and do not hesitate to send us your feed back

NEW DEADLINE to be noted

Category : Non classé

In case you missed the first announcement, this is to inform you that the abstract submission deadline for the 4th Satellite Soil Moisture Validation and Application Workshop (19-20 September 2017) and the CCI Soil Moisture User Workshop (18 September 2017) has been postponed to May 15th 2017.

The two meetings will take place at Vienna University of Technology, Austria.
For more info see

The abstract submission deadline is 15 May 2017.

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