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

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Abstract

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
Volume104
Issue numberA5
DOIs
StatePublished - May 1 1999

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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    Riley, P., Gosling, J. T., McComas, D. J., Pizzo, V. J., Luhmann, J. G., Biesecker, D., Forsyth, R. J., Hoeksema, J. T., Lecinski, A., & Thompson, B. J. (1999). Relationship between Ulysses plasma observations and solar observations during the Whole Sun Month campaign. Journal of Geophysical Research: Space Physics, 104(A5), 9871-9879. [1998JA900078]. https://doi.org/10.1029/1998ja900078