Waxaa la ogaaday in Callisto ay ka jawaabto kala duwanaanshaha magnetic field ee Jupiter sida goob si fiican u socodsiisa; taas oo ah, goobta ma geli karto gudaha Callisto, taasoo soo jeedinaysa in lakabka dareeraha ah ee dareeraha ah ee gudaha ugu yaraan 10 km. Jiritaanka baddu waxay u badan tahay haddii biyaha ay ku jiraan qadar yar oo ammonia ama antifreeze kale, illaa 5% miisaan ahaan. Xaaladdan oo kale, lakabka biyaha barafka ah wuxuu noqon karaa ilaa 250-300 km.
250 ilaa 300 oo km