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The Fall 2000 and Fall 2001 SOHO-Ulysses QuadraturesSOHO-Ulysses quadrature occurs when the SOHO-Sun-Ulysses included angle is 90 degrees. It is only at such times that the same plasma leaving the Sun in the direction of Ulysses can first be remotely analyzed with SOHO instruments and then later be sampled in situ by Ulysses instruments. The quadratures in December 2000 and 2001 are of special significance because Ulysses will be near the south and north heliographic poles, respectively, and the solar cycle will be near sunspot maximum. Quadrature geometry is sometimes confusing and observations are influenced by solar rotation. The Fall 2000 and 2001 quadratures are more complex than usual because Ulysses is not in a true polar orbit and the orbital speed of Ulysses about the Sun is becoming comparable to the speed of SOHO about the Sun. In 2000 Ulysses will always be slightly behind the pole but will appear to hang over the pole for over two months because it is moving around the Sun in the same direction as SOHO. In 2001 Ulysses will be slightly in front of the pole so that its footpoint will be directly observable. Detailed plots will be shown of the relative positions of SOHO and Ulysses will their relative positions. In neither case is true quadrature actually achieved, but this works to the observers advantage in 2001.
Document ID
20010021228
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Suess, S. T.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Poletto, G.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Rose, M. Franklin
Date Acquired
August 20, 2013
Publication Date
January 1, 2001
Subject Category
Astrophysics
Meeting Information
Meeting: ESLAB Symposium
Location: Nordwijk
Country: Netherlands
Start Date: February 1, 2001
Sponsors: European Space Agency
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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