The " warming " on Pluto, for example, is an extremely indirect measurement of atmospheric density during " two " occlusion events of stars-the atmosphere was thicker the second time, which may mean that more of it had thawed from the frozen state, which may mean that Pluto was warmer ( or not ).
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By this point most space scientists had abandoned the hypothesis that a change in magnetic field direction must accompany crossing of the heliopause; A key finding that persuaded many scientists that the heliopause had been crossed was an indirect measurement of an 80-fold increase in electron density, based on the frequency of plasma oscillations observed beginning on April 9, 2013, provided additional data.
