Abstract
The appearances of several X-ray active regions observed on March 7, 1970 and June 15, 1973 are compared with the corresponding coronal magnetic field topology. Coronal fields have been computed from measurements of the longitudinal component of the underlying magnetic fields, under the current-free hypothesis. An overall correspondence between X-ray structures and calculated field lines is established, and the magnetic counterpart of different X-ray features is also examined. A correspondence between enhanced X-ray emission and the location of compact closed field lines is suggested by this study.
Representative magnetic field values calculated under the assumption of current-free fields are given for heights up to 200″.
Similar content being viewed by others
References
Altschuler, M. D. and Newkirk, G.: 1969, Solar Phys. 9, 131.
Harvey, J. W.: 1969, Ph.D. Thesis, Univ. of Colorado, Dept. of Astro-Geophysics.
Krieger, A. S., Vaiana, G. S., and Van Speybroeck, L. P.: 1971 in R. Howard (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 387.
Levine, R.: 1974, private communication.
Levine, R. and Altschuler, M.: 1974, Solar Phys. 36, 345.
Livingston, W., Harvey, J., and Slaughter, C.: 1970, Nature 226, 1146.
Newkirk, G., Jr., Trotter, D. E., Altschuler, M. D., and Howard, R.: 1972, Solar Phys. 24, 370.
Rust, D. M.: 1966, Thesis, University of Colorado.
Rust, D. M.: 1970, Astrophys. J. 160, 315.
Rust, D. M. and Roy, J. R.: 1971 in R. Howard (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 569.
Schmidt, H. U.: 1964 in V. N. Ness (ed.), AAS-NASA Symposium on Physics of Solar Flares, NASA SP-50, 107.
Tandberg-Hanssen, E.: 1971 in R. Howard (ed.), ‘Solar Magnetic Fields’, IA U Symp. 43, 192.
Vaiana, G. S. and Giacconi, R.: 1969, in D. A. Tidman and D. G. Wentzel (eds.), Plasma Instabilities in Astrophysics, Gordon and Breach, N.Y., p. 91.
Vaiana, G. S., Krieger, A. S., and Timothy, A. F.: 1973a, Solar Phys. 32, 81.
Vaiana, G. S., Davis, J. M., Giacconi, R., Krieger, A. S., Silk, J. K., Timothy, A. F., and Zombeck, M.: 1973b, Astrophys. J. Letters 185, L47.
Van Speybroeck, L. P., Krieger, A. S., and Vaiana, G. S.: 1970, Nature 227, 818.
Author information
Authors and Affiliations
Additional information
On leave from the Osservatorio Astrofisico di Arcetri, Florence, Italy.
Rights and permissions
About this article
Cite this article
Poletto, G., Vaiana, G.S., Zombeck, M.V. et al. A comparison of coronal X-ray structures of active regions with magnetic fields computed from photospheric observations. Sol Phys 44, 83–99 (1975). https://doi.org/10.1007/BF00156848
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00156848