Speaker
Hugh Hudson
(University of Glasgow)
Description
The EVE Sun-as-a-star Doppler information has produced a surprising
result: hot active-region loops sustain steady flows on the order
of 100 km/s. The flows only occur at the higher temperatures (lines
of Mg XII and Fe XIV, for example), making the observation very
differential and redundant. Both of the EVE spectrographs (MEGS-A and
MEGS-B) show the effect. The flows are invariably in the prograde sense
(E limb blue, W limb red), independent of latitude or solar cycle.
EVE detects the flows directly by the bulk Doppler shift of lines
from isolated limb regions, and also systematically via cross-
correlation of AIA image centroids with EVE Doppler shifts.
Primary author
Hugh Hudson
(University of Glasgow)
