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Properties Of High-Latitude Cme-Driven Disturbances During Ulysses Second Northern Polar Passage, Daniel B. Reisenfeld, J. T. Gosling, R. J. Forsyth, P. Riley, O. C. St. Cyr

Physics and Astronomy Faculty Publications

Ulysses observed five coronal mass ejections (CMEs) and their associated disturbances while the spacecraft was immersed in the polar coronal hole (CH) flow above 70° N in late 2001. Of these CMEs, two were very fast (>850 km s⁻¹) driving strong shocks in the wind ahead, and two others were over-expanding. The two fast CMEs were observed leaving the Sun by LASCO/SOHO, and were observed in the ecliptic by Genesis and ACE. These were large events, spanning at least from the northern heliospheric pole to the ecliptic. One-dimensional hydrodynamic simulations indicate that these could be described as …