Terra image of TD15 (IMAGE) NASA/Goddard Space Flight Center Caption NASA's Terra satellite passed over TD 15 at 1:30 p.m. local time on Oct. 16 and the MODIS instrument aboard captured a visible image. The image showed the surface circulation had become elongated from north to south. There were also just a few weak swirls in the circulation envelope, and has degenerated into a trough (elongated area) of low pressure Credit Credit: NASA Worldview Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.