OBSERVATIONS OF PLASMA UPFLOW IN A WARM LOOP WITH HINODE/EIS

Journal Article · Fri Jul 20 04:00:00 EDT 2012 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/754/1/L4· OSTI ID:22047670

Tripathi, Durgesh ^[1]; Mason, Helen E; Del Zanna, Giulio ^[2]; Bradshaw, Steven ^[3]

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1. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411 007 (India)
2. Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom)
3. Department of Physics and Astronomy, Rice University, Houston, TX 77005 (United States)

A complete understanding of Doppler shift in active region loops can help probe the basic physical mechanism involved into the heating of those loops. Here, we present observations of upflows in coronal loops detected in a range of temperatures (log T = 5.8-6.2). The loop was not discernible above these temperatures. The speed of upflow was strongest at the footpoint and decreased with height. The upflow speed at the footpoint was about 20 km s{sup -1} in Fe VIII, which decreased with temperature, being about 13 km s{sup -1} in Fe X, about 8 km s{sup -1} in Fe XII, and about 4 km s{sup -1} in Fe XIII. To the best of our knowledge, this is the first observation providing evidence of upflow of plasma in coronal loop structures at these temperatures. We interpret these observations as evidence of chromospheric evaporation in quasi-static coronal loops.

• OSTI ID: 22047670
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 754; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
CHROMOSPHERE
DOPPLER EFFECT
EVAPORATION
HEATING
IRON IONS
PLASMA
PROBES
SOLAR CORONA
SUN
TEMPERATURE DEPENDENCE
ULTRAVIOLET RADIATION
VELOCITY