Abstract
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 × 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 × 106 K, 1 × 109 cm−3, and 2 × 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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References
Athay, R. G.: 1976, The Solar Chromosphere and Corona: Quiet Sun, D. Reidel Publ. Co., Dordrecht, Holland, p. 406.
Chase, R. C., Krieger, A. S., Švestka, Z., and Vaiana, G. S.: 1976, Space Res. 16, 917.
Cox, D. P. and Tucker, W. H.: 1969, Astrophys. J. 157, 1157.
Davis, J. M. and Krieger, A. S.: 1978, Bull. Am. Astron. Soc. 10, 439.
Davis, J. M. and Krieger, A. S.: 1982, Solar Phys., (in press).
Davis, J. M., Gerassimenko, M., Krieger, A. S., and Vaiana, G. S.: 1975, Solar Phys. 45, 393.
Foukal, P. V.: 1976, Astrophys. J. 210, 575.
Kopp, R. A. and Kuperus, M.: 1968, Solar Phys. 4, 212.
Krieger, A. S., Vaiana, G. S., and Van Speybroeck, L. P.: 1971, in R. Howard (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 397.
Landini, M., Monsignori-Fossi, B. C., Krieger, A. S., and Vaiana, G. S.: 1975, Solar Phys. 44, 69.
Noyes, R. W., Foukal, P. V., Huber, M. C. E., Reeves, E. M., Schmahl, E. J., Timothy, J. G., Vernazza, J. E., and Withbroe, G. L.: 1975, in S. Kane (ed.), ‘Solar Gamma, X-, and EUV Radiation’, IAU Symp. 68, 3.
Pneuman, G. W. and Kopp, R. A.: 1978, Solar Phys. 57, 49.
Poletto, G., Vaiana, G. S., Zombeck, M. V., Krieger, A. S., and Timothy, A. F.: 1975, Solar Phys. 41, 83.
Rosner, R., Tucker, W. H., and Vaiana, G. S.: 1978, Astrophys. J. 220, 643.
Serio, S., Vaiana, G. S., Godoli, G., Motta, S., Pirronello, V., and Zappala, R. A.: 1978, Solar Phys. 59, 65.
Spitzer, L.: 1962, Physics of Fully Ionized Gases, (2nd edition), Interscience, New York.
Švestka, Z.: 1976, in ‘International Symp. on Solar-Terrestrial Physics’, Physics of Solar Planetary Environments, Vol. I, p. 129.
Švestka, Z., Krieger, A. S., and Chase, R. C.: 1977, Solar Phys. 52, 69.
Tousey, R., Bartoe, J. D. F., Bohlin, J. D., Bruechner, G. E., Purcell, J. D., Scherrer, V. F., Sheeley, N. R., Schumacher, R. J., and Van Hoosier, M. E.: 1973, Solar Phys. 33, 265.
Tucker, W. H.: 1973, Astrophys. J. 186, 285.
Tucker, W. H. and Koren, M.: 1971, Astrophys. J. 168, 283.
Vaiana, G. S., Davis, J. M., Giacconi, R., Krieger, A. S., Silk, J. K., Timothy, A. F., and Zombeck, M.: 1973a, Astrophys. J. 185, L47.
Vaiana, G. S., Krieger, A. S., and Timothy, A. F.: 1973b, Solar Phys. 32, 31.
Vaiana, G. S., Krieger, A. S., Petrasso, R., Silk, J. K., and Timothy, A. F.: 1974, Proc. SPIE 44, 185.
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Davis, J.M., Krieger, A.S. Properties of coronal arches. Sol Phys 80, 295–307 (1982). https://doi.org/10.1007/BF00147975
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DOI: https://doi.org/10.1007/BF00147975