Flows in Sunspot Plumes Detected with SOHO

Details Flows in Sunspot Plumes Detected with SOHO Flows in Sunspot Plumes Detected with SOHO

1998-05-19

arxiv.org/abs/astro-ph/9805249v1

Astronomy and Astrophysics

Astrophysics

11 pages, 4 figures

Scientific paper

10.1086/311589

Bright EUV sunspot plumes have been observed in eight out of eleven different sunspot regions with the Coronal Diagnostic Spectrometer -- CDS on SOHO. From wavelength shifts we derive the line-of-sight velocity, relative to the average velocity in the rastered area, 120 arcsec x 120 arcsec. In sunspot plumes we find that the motion is directed away from the observer and increases with increasing line formation temperature, reaches a maximum between 15 and 41 km~s$^{-1}$ close to log T $\approx$ 5.5, then decreases abruptly. The flow field in the corona is not well correlated with the flow in the transition region and we discuss briefly the implication of this finding.

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