Magnetic fields at the solar wind termination shock

Details Magnetic fields at the solar wind termination shock Magnetic fields at the solar wind termination shock

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008natur.454...75b&link_type=abstract

Nature, Volume 454, Issue 7200, pp. 75-77 (2008).

Computer Science

65

Scientific paper

A transition between the supersonic solar wind and the subsonic heliosheath was observed by Voyager 1, but the expected termination shock was not seen owing to a gap in the telemetry. Here we report observations of the magnetic field structure and dynamics of the termination shock, made by Voyager 2 on 31 August-1 September 2007 at a distance of 83.7AU from the Sun (1AU is the Earth-Sun distance). A single crossing of the shock was expected, with a boundary that was stable on a timescale of several days. But the data reveal a complex, rippled, quasi-perpendicular supercritical magnetohydrodynamic shock of moderate strength undergoing reformation on a scale of a few hours. The observed structure suggests the importance of ionized interstellar atoms (`pickup protons') at the shock.

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