Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..932..144s&link_type=abstract
TURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS; 6th Annual International Astrophysics Conference. AIP Conference P
Astronomy and Astrophysics
Astrophysics
Mhd Waves, Plasma Waves, Turbulence, Solar Wind Plasma, Sources Of Solar Wind, Particle Emission, Solar Wind
Scientific paper
We report the results of a search for waves/turbulence in the Heliospheric Plasma Sheet (HPS) surrounding the Heliospheric Current Sheet (HCS). The HPS is treated as a distinctive heliospheric structure distinguished by relatively high Beta, slow speed plasma. The data used in the investigation are from a previously published study of the thicknesses of the HPS and HCS that were obtained in January to May 2004 when Ulysses was near aphelion at 5 AU. The advantage of using these data is that the HPS is thicker at large radial distances and the spacecraft spends longer intervals inside the plasma sheet. From the study of the magnetic field and solar wind velocity components, we conclude that, if Alfvén waves are present, they are weak and are dominated by variations in the field magnitude, B, and solar wind density, Np, that are anti-correlated. To distinguish between slow mode waves, Pressure Balance Structures (PBS) and Minor Modes, correlations between magnetic, kinetic and total static pressures (pB, pK, and pT) are studied. The slopes of the pB - pK, and pK - pT regression lines are qualitatively consistent with slow mode waves and rule out the other possibilities. In principle, the slopes are measures of the wave speed relative to the Alfvén and sound speeds and imply the direction of propagation with respect to the ambient field.
Smith Edward. J.
Zhou Xiaoyan
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