Shocks in the distant heliosphere

Details Shocks in the distant heliosphere Shocks in the distant heliosphere

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.6721w&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A4, p. 6721-6728

Physics

10

Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Interstellar Gas

Scientific paper

Voyager data are used to study two aspects of pickup proton shocks in the distant heliosphere: (1) Two shocks having similar speed jump of ~50 km/s observed at 5 AU and at 43 AU demonstrate the effects of pickup protons on weakening interplanetary shocks at increasing heliocentric distance. (2) On the basis of three shocks identified outside 34 AU from high-resolution plasma and magnetic field data we develop an empirical model to study the jump conditions of pickup protons across solar wind shocks. Making use of the empirical model one can study the postshock conditions of pickup protons for the global merged interaction region (GMIR) shock and the termination shock; this will enable us to calculate more accurately the propagation of the GMIR shock and the interaction of GMIR shock with the termination shock. We also find that the variation of the pickup proton temperature T1 across the shock is very close to the adiabatic relation that T1 is proportional to the magnetic field strength B.

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