Properties of high-latitude CME-driven disturbances during Ulysses second northern polar passage

Details Properties of high-latitude CME-driven disturbances during Ulysses second northern polar passage Properties of high-latitude CME-driven disturbances during Ulysses second northern polar passage

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30suly5r&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 19, pp. ULY 5-1, CiteID 8031, DOI 10.1029/2003GL017155

Astronomy and Astrophysics

Astrophysics

13

Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Solar Cycle Variations (7536)

Scientific paper

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 overpressured CMEs launched from the Sun at speeds initially faster than ambient, but then decelerating to the ambient solar wind speed as they propagated outward. The two over-expanding CMEs mark their first occurrence since Ulysses' first orbit when such CMEs were only observed in polar CH flow.

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