False-Color Image
An image in which colors are assigned to represent specific wavelengths of light—often outside the visible range—to highlight physical processes or chemical compositions in astronomical objects.
Source: hubblesite.org
APODs including "False-Color Image"
An Active Region of the Sun
16/06/1998
The Sun is a busy place. This false-color image depicts an active region near an edge of the Sun. Hot plasma is seen exploding off the Sun's photosphere and traveling along loops defined by the Sun's magnetic field. The red regions are particularly hot, indicating that some magnetic field loops carry hotter gas than others. These active loops were so large that the Earth could easily fit under one. The TRACE satellite was launched in April with plans to continue high-resolution imaging as the Sun passes Solar Maximum in the next few years.