Why coronal loops cannot exist without solar gravity

Details Why coronal loops cannot exist without solar gravity Why coronal loops cannot exist without solar gravity

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318..421c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 318, July 1, 1987, p. 421-427.

Astronomy and Astrophysics

Astrophysics

14

Chromosphere, Coronal Loops, Solar Gravitation, Stellar Models, Dynamic Models, Gravitational Effects, Magnetohydrodynamic Stability, Thermal Stability

Scientific paper

The authors develop a simple stability analysis of coronal loops which demonstrates that a loop is unstable to coronal temperature fluctuations unless a sufficiently large pressure perturbation accompanies the disturbance. Such pressure fluctuations are possible only if the chromospheric footpoints of the loop exhibit the property of dynamical stiffness, preventing the corona from expanding under the influence of a temperature increase. The stiffness of the chromosphere is shown to derive from its gravitational stratification and its "spring constant" to depend on the gravitational scale height. Any loop whose coronal length is large compared to the chromospheric scale height must therefore "see" the chromospheric footprints as essentially rigid.

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