✦ LIBER ✦

Properties of coronal arches

✍ Scribed by John M. Davis; Allen S. Krieger

Publisher: Springer
Year: 1982
Tongue: English
Weight: 1011 KB
Volume: 80
Category: Article
ISSN: 0038-0938
DOI: 10.1007/bf00147975

No coin nor oath required. For personal study only.

✦ Synopsis

The properties of coronal arches located on the peripheries of active regions, observed during a sounding rocket flight on March 8, 1973, are discussed. The arches are found to overlie filament channels and their footpoints are traced to locations on the perimeters of supergranulation cells. The arches have a wide range of lengths although their widths are well approximated by the value 2.2 x 109 cm. Comparison of the size of the chromospheric footprint with the arch width indicates that arches do not always expand as they ascend into the corona. The electron temperatures and densities of the plasma contained in the arches were measured and the pressure calculated; typical values are 2 x 106 K, 1 x 109 cm 3, and 2 x 10 1 dyne cm -2, respectively. The variation of these parameters with position along the length of the arch indicates that the arches are not in hydrostatic equilibrium.

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