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Other notable features of Jupiter are its cyclones near the northern and southern poles of the planet. These are called circumpolar cyclones (CPCs) and they have been observed by the Juno Spacecraft using JunoCam and JIRAM. The northern pole has eight cyclones moving around a central cyclone (NPC) while the southern pole only has five cyclones around a central cyclone (SPC). The cyclones look similar to hurricanes on Earth with trailing spiral arms and a denser center, although there are differences between the centers depending on the cyclone. Northern cyclones are labelled by n1-n8 while southern cyclones are labelled s1-s5. In the north, there are three cyclones where the centers have a slower, or even counter rotation. The cyclones in the north tend to be more stable and do not move as much as the southern cyclones. This could be due to the faster wind speeds that are experienced in the south, where the average wind speed is anywhere from 204 km/hr to 330 km/hr whereas the wind speeds in the north range from 157 km/hr to 354 km/hr. It has also been observed that the angular wind velocity increases as the center is approached and radius becomes smaller. The difference in the number of cyclones in the north compared to the south is due to the size of the cyclones. The southern CPCs tend to be bigger with radii ranging from 5,600 km to 7,000 km while northern CPCs range from 4,000 km to 4,600 km