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Ulysses: UVCS Coordinated ObservationsWe present results from coordinated observations in which instruments on Solar and Heliospheric Observatory (SOHO) and Ulysses were used to measure the density and flow speed of plasma at the Sun and to again measure the same properties of essentially the same plasma in the solar wind. Plasma was sampled by Ultraviolet Coronagraph Spectrometer (UVCS) at 3.5 and 4.5 solar radii and by Ulysses/SWOOPS at 5 AU. Data were acquired during a nearly 2 week period in May-June 1997 at a latitude of 9-10 degrees north of the equator, on the east limb and, hence, in the streamer belt and the source location of slow wind. Density and outflow speed are compared, in order to check for preservation of the near Sun characteristics in the interplanetary medium. By chance, Ulysses was at the very northern edge of the visible streamer belt. Nevertheless, no evidence of fast wind, or mixing with fast wind coming from the northern polar coronal hole, was evident at Ulysses. The morphology of the streamer belt was similar at the beginning and end of the observation period, but was markedly different during the middle of the period. A corresponding change in density (but not flow speed) was noted at Ulysses.
Document ID
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Suess, S. T.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Poletto, G.
(Osservatorio di Firenze Firenze, Italy)
Corti, G.
(Osservatorio di Firenze Firenze, Italy)
Simnett, G.
(Birmingham Univ. United Kingdom)
Noci, G.
(Florence Univ. Italy)
Romoli, M.
(Florence Univ. Italy)
Kohl, J.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA United States)
Goldstein, B.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1998
Subject Category
Meeting Information
Meeting: SOHO 7
Location: Northeast Harbor, ME
Country: United States
Start Date: September 1, 1998
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