Solar Physics

, Volume 194, Issue 1, pp 43–58

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


  • D. Banerjee
    • Armagh Observatory
  • L. Teriaca
    • Armagh Observatory
  • J.G. Doyle
    • Armagh Observatory
  • P. Lemaire
    • Insitut d'Astrophysique Spatiale, Unite Mixte CNRSUniversite Paris XI

DOI: 10.1023/A:1005253413687

Cite this article as:
Banerjee, D., Teriaca, L., Doyle, J. et al. Solar Physics (2000) 194: 43. doi:10.1023/A:1005253413687


We present observations of O vi 1032 Å line profiles obtained with the SUMER instrument on SOHO extending from the solar disk to 1.5 R 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 . Possible implications regarding the magnetic topologies of these two regions and related heating mechanisms are discussed. The O vi linewidth measurements are combined with UVCS output to provide an overview of its variations with height extending up to 3.5 R . We find a linear increase of the linewidth from 1 to 1.2 R , then a plateau followed by a sharp increase around 1.5 R .

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© Kluwer Academic Publishers 2000