Relationship between Ulysses plasma observations and solar observations during the Whole Sun Month campaign

Pete Riley, J. T. Gosling, D. J. McComas, V. J. Pizzo, J. G. Luhmann, D. Biesecker, R. J. Forsyth, J. T. Hoeksema, A. Lecinski, B. J. Thompson

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


In this report, we summarize measurements made by the plasma experiment on the Ulysses spacecraft during the period designated as "Whole Sun Month" (WSM, August 10 to September 8, 1996). This interval coincided with the return of solar wind variability at Ulysses. Ulysses was located, at ∼ 28° N heliographic latitude, at a heliocentric distance of 4.25 AU, and on the opposite side of the Sun from Earth. In particular, we explore the evolution of the solar wind between the Sun and Ulysses for several rotations surrounding WSM. Specifically, we map Ulysses measurements back toward the Sun by applying a two-dimensional inverse MHD algorithm. This approach is compared with the commonly used constant speed (or ballistic) approximation. We find that the MHD mapping technique produces substantially better results when compared with solar observations. Both the Ulysses MHD-mapped results and the solar observations are consistent with a picture of a modestly tilted streamer belt (< 10°) that was deformed northward by an active region at 240° - 270° longitude.

Original languageEnglish (US)
Article number1998JA900078
Pages (from-to)9871-9879
Number of pages9
JournalJournal of Geophysical Research: Space Physics
Issue numberA5
StatePublished - May 1 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Space and Planetary Science


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