Multi-Spacecraft Observations of ICMEs and Magnetic Clouds: Ulysses and STEREO

Details Multi-Spacecraft Observations of ICMEs and Magnetic Clouds: Ulysses and STEREO Multi-Spacecraft Observations of ICMEs and Magnetic Clouds: Ulysses and STEREO

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh52b..08f&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH52B-08

Physics

2101 Coronal Mass Ejections (7513), 2111 Ejecta, Driver Gases, And Magnetic Clouds, 2134 Interplanetary Magnetic Fields

Scientific paper

The Ulysses spacecraft, in a six year period polar orbit of the Sun, is presently making its third fast latitude scan through heliolatitudes from 80°S in February 2007 to 80°N in January 2008. At perihelion in August 2007 the spacecraft is at a distance of 1.4 AU from the Sun and fortuitously is almost radially aligned with the Earth in heliolongitude. Thus the orbit is also bisecting the locations of the two STEREO spacecraft as they separate in longitude between 10 and 15° either side of the Earth. This period therefore provides a unique opportunity to study the solar wind and its embedded magnetic field from vantage points separated in both longitude and latitude. In this paper we will focus on what we can learn about the structure and propagation of the interplanetary manifestations of coronal mass ejections (ICMEs) from observations by this combination of spacecraft. At the time of writing, data from the prime August period is not yet fully available. However, a period of probable coronal mass ejection activity is apparent in the Ulysses data over about 8 days at the end of June, into July, culminating in a very clear magnetic cloud on the 4th and 5th of July. On a first look, a similarly clear signature is not readily apparent in browse data from either of the STEREO spacecraft or ACE but at this time Ulysses is still about 40° in longitude west (ahead) of STEREO-A and about 30° south in latitude. Nonetheless, this event provides a first interesting case study on which we can build.

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