NASA's IBEX (Interstellar Boundary Explorer) spacecraft has made the first all-sky map of the heliosphere and the results have taken researchers by surprise. The map is bisected by a bright, winding ribbon of unknown origin which runs perpendicular to the direction of the galactic magnetic field just outside the heliosphere. The ribbon is not a source of light but rather a soruce of particles -- energetic neutral atoms or ENAs. IBEX's sensors can detect these particles, which are produced in the outer heliosphere where the solar wind begins to slow down and mix with interstellar matter from outside the solar system. Eric Christian, IBEX deputy mission scientist at NASA's Goddard Space Flight Center notes: "This ribbon winds between the two Voyager spacecraft and was not observed by either of them ... It's like having two weather stations but missing the big storm that runs between them." IBEX principal investigator Dave McComas oc the Southwest Research Institute adds: We're missing some fundamental aspect of interaction between the heliosphere and the rest of the galaxy. Theorists are working like crazy to figure this out."
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Link to story at www.SpaceWeather.com or just Google 'Giant Ribbon Discovered at the Edge of the Solar System 10.15.2009' for the NASA writeup.









