Odin space telescope monitoring of water vapor in the stratosphere of Jupiter

► Monitoring of H2O in Jupiter's stratosphere with the Odin space telescope. ► Possible decrease by ∼15% of the line-to-continuum ratio between 2002 and 2009. ► Series of scenarios based on IDP and SL9 models that fit the 1999-2009 data set. ► A confirmation of the decrease with Herschel would prove the SL9 origin of Jovian H2O.