Skip to Main Content
Evening (6pm) and morning (6am) SMOS observations are different. The greatest difference is for incidence angles less than approximately 30°, but this difference can not be explained with physical models. There is a smaller but significant difference in evening and morning SMOS observations for incidence angles greater than approximately 50°. Evening values of the polarization index are higher than morning values. This difference does have two plausible explanations: either soil moisture has decreased overnight; or vegetation water content has increased overnight.