Ulysses Solar Wind Plasma Observations at High Southerly Latitudes

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Science  19 May 1995:
Vol. 268, Issue 5213, pp. 1030-1033
DOI: 10.1126/science.268.5213.1030


Solar wind plasma observations made by the Ulysses spacecraft through –80.2° solar latitude and continuing equatorward to –40.1° are summarized. Recurrent high-speed streams and corotating interaction regions dominated at middle latitudes. The speed of the solar wind was typically 700 to 800 kilometers per second poleward of –35°. Corotating reverse shocks persisted farther south than did forward shocks because of the tilt of the heliomagnetic streamer belt. Sporadic coronal mass ejections were seen as far south as –60.5°. Proton temperature was higher and the electron strahl was broader at higher latitudes. The high-latitude wind contained compressional, pressure-balanced, and Alfvénic structures.