Radial gradients of ion densities and temperatures observed by SWICS/Ulysses

Details Radial gradients of ion densities and temperatures observed by SWICS/Ulysses Radial gradients of ion densities and temperatures observed by SWICS/Ulysses

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...96l&link_type=abstract

Max-Planck-Inst. für Aeronomie, International Solar Wind 8 Conference, p. 96

Physics

Solar Wind, Protons, Alpha Particles, Density Distribution, Temperature Gradients, Ion Temperature, Heliosphere, Atmospheric Heating, Solar Wind Velocity, Solar Physics, Ulysses Mission, Temperature Ratio, Radial Flow, Adiabatic Conditions, Compressibility Effects, Velocity Distribution

Scientific paper

Mean density and temperature gradients of solar wind protons and alpha-particles between 1 and 5.4 AU are established from SWICS/Ulysses observations. All parameters are classified in speed intervals. au order scheme giving us a natural extension of the Helios observations. which were usually classified according to speed of the wind. The radial gradients show a similar behaviour of both particle species, while the particles radially propagate and thereby cool off in the heliosphere. The slow solar wind is found, for protons as well as a particles. to expand adiabatically all the way out to 5.4 AU, while the fast wind evolves non-adiabatically and is heated by interplanetary sources. It, seems that the heating rate of the a-particles is larger than the heating rate of the protons. The ion temperature ratio and density ratio are determined. They do not indicate any radial dependence. The temperature ratio Talpha/Tp is on average about 4. It has a maximum of 4.5 in the velocity interval where 400 km/s is less than vp is less than 500 km/s, while in slow wind with vp is less than 400 km/s it has a minimum value of 37. and for fast wind with vp is greater than 500 km/s it is 3.9. The density gradients shows compression effects resulting from fast wind overtaking the slow wind.

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