Steady Flows Detected in Extreme-Ultraviolet Loops

Details Steady Flows Detected in Extreme-Ultraviolet Loops Steady Flows Detected in Extreme-Ultraviolet Loops

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...567l..89w&link_type=abstract

The Astrophysical Journal, Volume 567, Issue 1, pp. L89-L92.

Astronomy and Astrophysics

Astronomy

86

Sun: Corona

Scientific paper

Recent Transition Region and Coronal Explorer (TRACE) observations have detected a class of active region loops whose physical properties are inconsistent with previous hydrostatic loop models. In this Letter we present the first co-aligned TRACE and the Solar Ultraviolet Measurement of Emitted Radiation (SUMER) observations of these loops. Although these loops appear static in the TRACE images, SUMER detects line-of-sight flows along the loops of up to 40 km s-1. The presence of flows could imply an asymmetric heating function; such a heating function would be expected for heating that is proportional to (often asymmetric) footpoint field strength. We compare a steady flow solution resulting from an asymmetric heating function to a static solution resulting from a uniform heating function in a hypothetical coronal loop. We find that the characteristics associated with the asymmetrically heated loop better compare with the characteristics of the loops observed in the TRACE data.

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