Seasonal Changes on Titan (Natural Colors; credits: NASA/JPL/Space Science Institute)

Seasonal changes in the Atmosphere of Saturn's largest moon are captured in this Natural Color image, which shows Titan with a slightly darker top half and a slightly lighter bottom half.
Titan's Atmosphere has a seasonal hemispheric dichotomy, and this image was taken shortly after Saturn's August 2009 Equinox.
Images taken using red, green and blue spectral filters were combined to create this Natural Color view.
Scientists have found that the Winter Hemisphere typically appears to have more high-altitude haze, making it darker at shorter wavelengths (UltraViolet through blue) and brighter at InfraRed wavelengths.

The switch between dark and bright occurred over the course of a year or two around the last Equinox. Scientists are studying the mechanism responsible for this change, and will monitor the dark-light difference as it flip-flops now that the 2009 Equinox has signaled the coming of Spring and then Summer in the Northern Hemisphere.
Although this hemispheric boundary appears to run directly East-West near the Equator, its position is not level with latitude and is actually offset from the Equator by about 10° of Latitude.
This view looks toward the Saturn-facing side of Titan. North on Titan is up.

The images were obtained with the Cassini Spacecraft wide-angle camera on Aug. 25, 2009 at a distance of approx. 174.000 Km (such as about 108.000 miles) from Titan.
Image scale is roughly 10 Km (a little more than 6 miles) per pixel.