Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.3003s&link_type=abstract
American Astronomical Society Meeting 210, #30.03; Bulletin of the American Astronomical Society, Vol. 39, p.142
Astronomy and Astrophysics
Astrophysics
Scientific paper
The Ultraviolet Coronagraph Spectrometer (UVCS) on the Solar and Heliospheric Observatory (SOHO) has observed coronal streamers at all phases of the solar activity cycle. A subset of the streamers at solar minimum exhibit a unique feature, first discovered with UVCS, which is a region of reduced emission near the streamer axis as observed in the emission of OVI 103.2 nm. These same streamer core regions show a maximum in intensity at H I Ly-alpha and visible light. We use the UVCS synoptic observations to search for all streamers with this unique feature and then compare the physical properties of these streamers with those of streamers without the reduced OVI emission. The differences may provide clues to the streamer magnetic field configuration and the nature of the solar wind that flows from these structures.
This work is supported by NASA grants NAG5-12781 and NNG05GG38G to the Smithsonian Astrophysical Observatory. SOHO is a project of international cooperation between the European Space Agency and NASA.
Panasyuk Alexander V.
Strachan Leonard Jr.
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