Polar Plumes and Inter-plume regions as observed by SUMER on SOHO

Details Polar Plumes and Inter-plume regions as observed by SUMER on SOHO Polar Plumes and Inter-plume regions as observed by SUMER on SOHO

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000soph..194...43b&link_type=abstract

Solar Physics, v. 194, Issue 1, p. 43-58 (2000).

Physics

28

Scientific paper

We present observations of Ovi 1032 Å line profiles obtained with the SUMER instrument on SOHO extending from the solar disk to 1.5 R_solar above the limb in the north polar coronal hole. Variations of the intensity and linewidth in the polar plume and inter-plume regions are investigated. We find an anti-correlation between the intensity and the linewidth in the plume and inter-plume regions with detailed plume structures been seen out to 1.5 R_solar. Possible implications regarding the magnetic topologies of these two regions and related heating mechanisms are discussed. The Ovi linewidth measurements are combined with UVCS output to provide an overview of its variations with height extending up to 3.5 R_solar. We find a linear increase of the linewidth from 1 to 1.2 R_solar, then a plateau followed by a sharp increase around 1.5 R_solar.

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