On what basis and how are the orbits of artificial stellites classified?
Medium earth orbits:

Explanation

Depending on the height of the satellite 's orbit above the earth's surface , the satellite orbits are classified as below :
(a) If the height of the satellite orbit above the earth's surface is between 200 km and 35780 km , the orbits are called medium earth orbits .
(b) In these orbits, the satellites complete one revolution in 2 to 24 hours .
(c) The geostationary satellites cannot be used in the study of polar regions . For this purpose , elliptical medium earth orbits are also called as polar orbits.