Abstract
The steady-state pressure structure of a solar coronal loop is discussed using the theory of magneto-hydrodynamical turbulence in cylindrical geometry. The steady state is represented by the superposition of two Chandrasekhar-Kendall functions. This representation, in principle can delinetate the three dimensional temperature structure of the coronal loop. In this paper, we have restricted ourselves to a two dimensional modeling since only this structure submits itself to the scrutiny of the available observations. The radial as well as the axial variations of the pressure in a constant density loop are calculated. These variations are found to conform to the observed features of cool core and hot sheath of the loops as well as to the location of the temperature maximum at the apex of the loop. We find that these features are not present uniformly all along either the length of the loop or across the radius as will be shown in the text. We have also discussed the possible oscillatory nature of these pressure variations and the associated time periods have been estimated.
Similar content being viewed by others
References
Foukal, P. V.: 1978, Astrophys. J. 223, 1046.
Hood, A. W. and Priest, E. R.: 1979, Astron. Astrophys. 77, 233.
Krieger, A. S., de Feiter, L. D., and Vaiana, G. S.: 1976, Solar Phys. 47, 117.
Krishan, V.: 1983a, A Steady State Model of Active Region Coronal Loops. Proceedings of College on Radiation in Plasmas, Trieste, 1983.
Krishan, V.: 1983b, Solar Phys. 88, 155.
Krishan, V.: 1985, Solar Phys. 95, 269.
Levine, R. H. and Withbroe, G. L.: 1977, Solar Phys. 51, 83.
Montgomery, D., Turner, L., and Vahala, G.: 1978, Phys. Fluids 21, 757.
Poletto, G., Vaiana, G. S., Zomback, M. V., Krieger, A. S., and Timothy, A. F.: 1975, Solar Phys. 44, 83.
Taylor, J. B.: 1974, Phys. Rev. Letters 33, 1139.
Tsinganos, K. C: 1981, Astrophys. J. 245, 764.
Tsinganos, K. C.: 1982a, Astrophys. J. 252, 775.
Tsinganos, K. C.: 1982b, Astrophys. J. 259, 820.
Vaiana, G. S. and Rosner, R.: 1978, Ann. Rev. Astron. Astrophys. 16, 393.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Krishan, V. Two-dimensional pressure structure of a coronal loop. Sol Phys 97, 183–189 (1985). https://doi.org/10.1007/BF00152987
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00152987