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Instrument: ETM+ : Enhanced Thematic Mapper Plus
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Description
The Landsat Enhanced Thematic Mapper Plus (ETM+) is a sensor carried onboard the Landsat 7 satellite and has acquired images of the Earth nearly continuously since July 1999, with a 16-day repeat cycle.

An instrument malfunction occurred on May 31, 2003; as a result, all Landsat 7 image data acquired from July 14, 2003 (20:32:40 GMT) to the present were collected in SLC-off mode. Image data acquired from 5/31/03 (21:42:35 GMT) to 7/14/03 (20:32:40 GMT) and from 9/3/03 (01:32:15 GMT) to 9/17/03 (06:22:27 GMT) are not available.

On April 1, 2007, the Landsat 7 mission began imaging in an alternate mirror-scanning control mode from the original Scan Angle Monitor (SAM) process that has been used since the satellite was launched in 1999. This change, known as Bumper Mode, is necessary due to a predictable physical wear of the mirror bumpers mounted within the Enhanced Thematic Mapper Plus (ETM+) imaging system. Landsat 7 data users should notice little or no change as a result of this transition. Five years ago, the Landsat 5 Thematic Mapper (TM) scanner was successfully converted to this alternate imaging mode, and customers have reported no problems related to that change.

Information provided by http://eros.usgs.gov/#/Find_Data/Products_and_Data_Available/ETM

Online Resources
chttp://landsat.gsfc.nasa.gov/about/etm+.html
http://landsathandbook.gsfc.nasa.gov/handbook/handbook_htmls/chapter3/chapter3.html
http://eros.usgs.gov/#/Find_Data/Products_and_Data_Available/ETM