GOCE follows a near-circular path at an altitude of about 224 km (low-Earth orbit*).
ORBIT: Sun-synchronous, dawn-dusk
In a Sun-synchronous orbit the satellite, as it travels from the North to the South Pole, passes over the same part of the Earth at roughly the same local time every day.
A dawn-dusk orbit is a special case of Sun-synchronous orbit that allows a satellite to be permanently bathed in sunlight.
The satellite perpetually trails the shadow of the Earth cast by the Sun. Because the satellite is close to the shadow, the part of the Earth's surface directly below the satellite is always at sunset or sunrise, hence the name of this type of orbit. An advantage of it is that the satellite always has its solar panels bathed in sunlight so that it can produce power by this means continuously (Encyclopedia of science).
*Low-Earth orbit (LEO)-altitude range from 160 to 2000 km above the Earth's surface.