Scientists working on NASA’s Interstellar Boundary Explorer mission have nabbed their first direct glimpse of the so-called heliotail, the long trailing edge of the solar wind. Much to their surprise, three years of data from IBEX, as the Earth-orbiting craft is known, showed that the tail has a sort of clover shape, with separate “lobes” of faster- and slower-moving solar wind.
“Scientists always presumed the heliosphere had a tail,” IBEX mission scientist Eric Christian said during the conference. “But this is the first real data we have that gives us the shape of the tail. We’ve never taken a picture of it.”
The heliosphere is the vast magnetic bubble around the solar system, created by solar wind emanating in all directions from the sun. As the heliosphere moves through the interstellar medium, its tail trails behind — much like the tail of a comet, according to study lead author and IBEX principal investigator Dave McComas of the Southwest Research Institute in San Antonio.
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