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Forward and reverse CIR shocks at 4-5 AU: Ulysses

Tsurutani, B. T.; Echer, E.; Guarnieri, F. L.

In this article, we study fast shocks at CIR boundaries during an extended interval of 15 consecutive major high speed solar wind streams in 1992-1993. Ulysses was 4-5 AU from the sun. The Abraham-Schrauner shock normal method and the Rankine-Hugoniot relations were used to determine fast shock directions and speeds. Out of 33 potential CIR shocks…

Study of the solar Slow Sonic, Alfvén and Fast Magnetosonic transition surfaces

Katsikas, Valadis; Exarhos, George; Moussas, Xenophon

In this paper we study the shape, extend and time variations of the solar wind transition surfaces using the Lima and Priest (1993) hydrodynamic model adequately adapted for the case of the solar wind flow. The transition surfaces, namely the Slow (Sonic), the Alfvén, and the Fast Magnetosonic surface, are important boundaries around the Sun and p…