An unusually fast interplanetary coronal mass ejection observed by Ulysses at 5 AU on 15 November 2003

Details An unusually fast interplanetary coronal mass ejection observed by Ulysses at 5 AU on 15 November 2003 An unusually fast interplanetary coronal mass ejection observed by Ulysses at 5 AU on 15 November 2003

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11001102d&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A1, CiteID A01102

Astronomy and Astrophysics

Astrophysics

4

Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections (2101), Solar Physics, Astrophysics, And Astronomy: Solar And Stellar Variability (1650), Interplanetary Physics: Ejecta, Driver Gases, And Magnetic Clouds, Interplanetary Physics: Solar Wind Plasma

Scientific paper

On 15 November 2003, at ~2030 UT, Ulysses/SWOOPS observed the onset of a large, unusually fast interplanetary coronal mass ejection (ICME) in the solar wind at 5.2 AU. Ulysses measured the peak solar wind flow speed associated with this event, vmax = 993 km s-1, in the turbulent sheath region preceding the ICME. This is the fastest solar wind speed recorded by Ulysses/SWOOPS at this distance since November 1992. On 7 November 2003 at 1554 UT, SOHO/LASCO observed the solar counterpart of this ICME behind the west limb of the Sun; the CME had a plane-of-sky speed of 1995 km s-1. We believe this CME originated in AR 0486, the same active region responsible for the extremely fast ICMEs that impacted the Earth on 29 and 30 October 2003. The ICME took at least 4.3 days to propagate past Ulysses and had a radial width of ~2.1 AU. The ICME was a magnetic cloud, with a depressed proton beta of ~0.01 and a smooth rotation of the magnetic field polar angle from 43° to -62°. In addition, Ulysses/SWOOPS also observed bidirectional electron streaming throughout the ICME, indicating that even at this distance, closed field lines threaded the entire event. In the days preceding the ICME, Ulysses observed disturbed solar wind conditions, including six shocks from 6 November to 15 November and several small ICMEs, indicating a high degree of solar activity.

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