Vibrating air columns also have resonances at harmonics, like strings. Objects respond more strongly to vibrations at certain frequencies, known as resonances. This may be used in order to remove unwanted resonances or boost certain frequencies. Effects on Schumann resonances have been reported following geomagnetic and ionospheric disturbances. This is done by ensuring that multiple room resonances are not at similar frequencies. The B and B nuclei also cause splitting in the resonances of attached nuclei. Hadrons have excited states known as resonances. There are several other resonances and interactions that enhance Pluto's stability. They correspond to the locations of orbital resonances with Jupiter. Both factors lead to more chaotic orbital behavior at or near mean-motion resonances. No orbital resonances with the binary have been found. Specialized receivers and antennas are needed to detect and record Schumann resonances. Observations of Schumann resonances have been used to track global lightning activity. There were acoustic limitations due to mechanical resonances in both the recording and playback system. Planets with an eccentric orbit could be locked in other resonances.