Flows in Sunspot Plumes Detected with Solar and Heliospheric Observatory

Details Flows in Sunspot Plumes Detected with Solar and Heliospheric Observatory Flows in Sunspot Plumes Detected with Solar and Heliospheric Observatory

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...502l..85b&link_type=abstract

Astrophysical Journal Letters v.502, p.L85

Astronomy and Astrophysics

Astronomy

17

Sun: Corona, Sun: Transition Region, Sun: Uv Radiation, Sun: Sunspots

Scientific paper

Bright extreme-UV sunspot plumes have been observed in eight out of 11 different sunspot regions with the Coronal Diagnostic Spectrometer on Solar and Heliospheric Observatory. From wavelength shifts, we derive the line-of-sight velocity relative to the average velocity in the rastered area, 120^{''}x120^{''} . 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 {log}T~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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