NIGHTTIME TM SHORT-WAVELENGTH INFRARED DATA-ANALYSIS OF BARREN ISLANDVOLCANO, SOUTH ANDAMAN, INDIA

Landsat TM short wavelength infrared data can be used to estimate and monitor active volcano temperatures of 150-degrees-C and above. Howeve r, during the daytime, the total measured radiance from a volcano in s hort wavelength infrared region consists of both reflected (due to Sun ) and emitted (due to molten lava) radiance components. This problem c an be overcome by using night-time data because, in the absence of sol ar radiation, the signal recorded by the sensor consists only of therm al radiation emitted by the erupting volcano. Thus, night-time TM data of 8 July 1991, have been used to study the recent volcanic eruption in Barren Island.