SOHO/UVCS Observations of the He I Focusing Cone Near the Sun

Details SOHO/UVCS Observations of the He I Focusing Cone Near the Sun SOHO/UVCS Observations of the He I Focusing Cone Near the Sun

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh32c..04r&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH32C-04

Physics

2144 Interstellar Gas, 2162 Solar Cycle Variations (7536)

Scientific paper

The UVCS spectrometer has observed He I 584 emission scattered by the helium focusing cone. The cone has been observed both upwind and downwind of the Sun along with sightlines crossing the cone between about 0.15 and 0.75 solar radii. Observations since December 1996 show that the brightness has declined by a factor of 4. The fading indicates an increased rate of collisional ionization as solar activity increased.

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