The First Decade of UVCS/SOHO: Coronal Hole Properties

Details The First Decade of UVCS/SOHO: Coronal Hole Properties The First Decade of UVCS/SOHO: Coronal Hole Properties

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.1003m&link_type=abstract

American Astronomical Society, SPD meeting #37, #10.03; Bulletin of the American Astronomical Society, Vol. 38, p.237

Astronomy and Astrophysics

Astrophysics

Scientific paper

We have measured with the SOHO Ultraviolet Coronagraph Spectrometer (UVCS) the physical properties of over 155 large coronal holes that produced a variety of high-speed solar wind conditions at 1 AU. This data set includes observations of coronal holes of different sizes and latitudinal locations present throughout solar cycle 23.In the spring of 2006, the polar coronal holes have not yet evolved to the fully quiescent minimum state seen in 1996-1997, although the next solar minimum is expected to occur during 2006-2007. We will present the solar cycle dependence of the derived plasma parameters for O5+ and protons from the last solar minimum in 1996 to present and compare them, where possible, with the in situ solar wind properties.This work is supported by NASA under Grant NNG05GG38G tothe Smithsonian Astrophysical Observatory, by the Italian Space Agency, and by PRODEX (Swiss contribution).

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