Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...158..288h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 158, no. 1-2, April 1986, p. 288-296. Research supported by the Alexander von
Astronomy and Astrophysics
Astrophysics
11
Chromosphere, Magnetic Flux, Magnetohydrodynamic Stability, Solar Atmosphere, Solar Magnetic Field, Solar Oscillations, Carbon Monoxide, Convection, Radiative Heat Transfer, Solar Temperature, Spicules
Scientific paper
The linear stability of cool flux tubes in the solar chromosphere which are initially in radiative equilibrium is examined. Owing to the presence of carbon monoxide, there exists a narrow region near the temperature minimum where the temperature gradient becomes steep enough to drive a convective instability. The thin flux tube equations are used and in a simple manner radiative heat exchange with the ambient medium are included. Initial states of constant beta (where beta is the ratio of gas to magnetic pressure) are considered. Results for various values of beta are presented. It is found that for beta less than 5.7 the tube is overstable with periods in the range 300-600 s. At beta = 5.7 a bifurcation occurs into two purely growing modes. Growth rates, eigenvectors of the fundamental modes are calculated and phase relationships are examined. It is suggested that overstable oscillations should invariably be associated with cool flux tubes. These oscillations transport energy and can thus change the thermodynamic structure of flux tubes. It is conjectured that the CO overstability may be responsible for spicules.
Hasan Sirajul S.
Kneer Franz
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