Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..409g&link_type=abstract
In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun
Physics
Solar Plumes, Coronal Holes, Doppler Dimming
Scientific paper
Understanding the nature of polar plumes is an important outstanding question for coronal physics. The current best picture, that they represent higher density, lower velocity plasma in a two-component solar wind, is open to challenge and requires further definitive research. We have studied the region up to 1.3 solar radii above the limb, in a polar coronal hole during solar minimum. Observations with SUMER of the oxygen VI doublet at 1032 Å are interpreted in terms of the outflow velocity, using the Doppler dimming technique. Understanding these structures can have an important influence on theories of heating and acceleration of the fast solar wind and the structure of the local magnetic field. Interpretation of an "interplume" region leads to flow velocities ranging from 20 km/s at 1.1 Ro up to 46 km/s at 1.3 Ro. The more intense regions, known as plumes, are difficult to understand, due to uncertainties regarding their 3-dimensional structure.
Bely-Dubau Francoise
Gabriel Alan H.
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