Expansion Factors in Coronal Holes and Plume/Interplume UVCS Observations

Details Expansion Factors in Coronal Holes and Plume/Interplume UVCS Observations Expansion Factors in Coronal Holes and Plume/Interplume UVCS Observations

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spd....28.0108p&link_type=abstract

American Astronomical Society, SPD meeting #28, #01.08; Bulletin of the American Astronomical Society, Vol. 29, p.880

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We show that expansion factors in plumes and coronal hole areas devoid of plumes are nearly equal because the plasma beta is <<1. Hence, the overall coronal hole expansion factor is equal to the expansion factors of its densest structures. UVCS plume and interplume observations of coronal holes are illustrated, with the purpose of showing the data capabilities. Integration along the line of sight, through a medium containing high and low pressure regions, and the rapid decrease with heliocentric distance of plume intensity, presently hinder an observational determination of the expansion factors between 1.5 and 2 solar radii.

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