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- W1963553847 abstract "The tenuous supersonic solar wind that streams from the top of the corona passes through a natural boundary -- the Alfv'en surface -- that marks the causal disconnection of individual packets of plasma and magnetic flux from the Sun itself. The Alfv'en surface is the locus where the radial motion of the accelerating solar wind passes the radial Alfv'en speed, and therefore any displacement of material cannot carry information back down into the corona. It is thus the natural outer boundary of the solar corona, and the inner boundary of interplanetary space. Using a new and unique motion analysis to separate inbound and outbound motions in synoptic visible-light image sequences from the COR2 coronagraph on board the STEREO-A spacecraft, we have identified inbound wave motion in the outer corona beyond 6 solar radii for the first time, and used it to determine that the Alfv'en surface is at least 12.5 solar radii from the Sun over the polar coronal holes and 17 solar radii in the streamer belt, well beyond the distance planned for NASA's upcoming Solar Probe Plus mission. To our knowledge this is the first measurement of inbound waves in the outer solar corona, and the first direct measurement of lower bounds for the Alfv'en surface." @default.
- W1963553847 created "2016-06-24" @default.
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- W1963553847 date "2014-05-12" @default.
- W1963553847 modified "2023-10-18" @default.
- W1963553847 title "INBOUND WAVES IN THE SOLAR CORONA: A DIRECT INDICATOR OF ALFVÉN SURFACE LOCATION" @default.
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- W1963553847 doi "https://doi.org/10.1088/0004-637x/787/2/124" @default.
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