A Technique for Comparing Solar Wind Structures Observed by ACE and Ulysses

H. A. Elliott, D. J. McComas, P. Riley

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Comparison of solar wind observations from the ACE spacecraft, in the ecliptic plane at ∼1 AU, and the Ulysses spacecraft as it orbits over the Sun's poles, may provide valuable information about the latitudinal extent and variation of solar wind structures in the heliosphere. While qualitative comparisons can be made using average properties observed at these two locations, comparison of specific, individual structures requires a procedure to determine if a given structure has been observed by both spacecraft. Before addressing the challenge of comparing such structures at different latitudes, we seek to benckmark our procedure by comparing solar wind structures observed when both spacecraft were near the ecliptic plane. In this paper we assess the use of a 1-D hydrodynamic code to propagate ACE plasma measurements out to the distance of Ulysses and develop a procedure for compensating for the differing longitudes of the ACE and Ulysses spacecraft. In addition to comparing the plasma parameters and their characteristic profiles, we examine superthermal electron measurements and magnetic field polarity to determine if the same features are encountered at both ACE and Ulysses. We find that when both spacecraft are near the ecliptic plane; they frequently observe the same features.

Original languageEnglish (US)
Title of host publicationSolar Wind Ten
Subtitle of host publicationProceedings of the 10th International Solar Wind Conference
EditorsMarco Velli, Roberto Bruno, Francesco Malara
PublisherAmerican Institute of Physics Inc.
Number of pages4
ISBN (Electronic)0735401489
StatePublished - Sep 2 2003
Externally publishedYes
Event10th International Solar Wind Conference - Pisa, Italy
Duration: Jun 17 2002Jun 21 2002

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Other10th International Solar Wind Conference

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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