Abstract
Measurements of the C iv 1548 Å and Si iv 1393 Å lines made with the University of Colorado Ultraviolet Spectrometer on board OSO-8 show that the mean profiles are redshifted at disk center. Assuming these lines to be optically thin, we measure an apparent average downflow of material in the 50 000 to 100 000 K temperature range which is weighted by the emission measure in these lines. The magnitude of the redshift varies from 6–17 km s−1 with a mean of 12 km s−1 and is persistent at least on the order of months, which is the time covered by the observations presented in this paper. Pneuman and Kopp (1978) have demonstrated that the flux of material associated with this downflow is of the same order of magnitude as the flux of material being carried upward in spicules. Thus, it is possible that material observed to be downflowing in C iv and Si iv has its origins in the upward moving spicule material.
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References
Athay, R. G.: 1977, Mem. Soc. Astron. Italiana 48, 509.
Athay, R. G. and White, O. R.: 1979, Astrophys. J. Suppl. 39, 333.
Billings, D. E., Roussel-Dupré, R., and Francis, M. H.: 1977, Solar Phys. 55, 287.
Brown, C. M., Tilford, S. G., and Tousey, R.: 1974, J. Opt. Soc. Am. 64, No. 12, 1665.
Brueckner, G. E.: 1979paper presented at XVIIth General Assembly of the IAU, Montreal, August 1979.
Bruner, E. C., Jr.: 1977, Space Sci. Inst. 3, 369.
Bruner, E. C., Jr.: 1978, Astrophys. J. 226, 1140.
Bruner, E. C., Jr., Chipman, E. G., Lites, B. W., Rottman, G. J., Shine, R. A., Athay, R. G., and White, O. R.: 1976, Astrophys. J. Letters 210, L97.
Chipman, E. G.: 1977, Solar Phys. 55, 277.
Doschek, G. A., Feldman, U., and Bohlin, J. D.: 1976a, Astrophys. J. Letters 205, L177.
Doschek, G. A., Feldman, U., Van Hoosier, M. E., and Bartoe, J. D. F.: 1976b, Astrophys. J. Suppl. 31, 434.
Gause, K. and Bruner, E. C. Jr.: 1976, paper entitled ‘Structural and Mechanical Systems’ contained in LASP internal publication, Design and Operation of the University of Colorado Experiment Aboard OSO-8.
Linsky, J. L. and Avrett, E. H.: 1970, Publ. Astron. Soc. Pacific 82, No. 485, 169.
Pneuman, G. W. and Kopp, R. A.: 1978, Solar Phys. 57, 49.
Roussel-Dupré, R. A. and Beerman, C.: 1981, Astrophys. J., submitted for publication.
Roussel-Dupré, D., Shine, R. A., Chipman, E. G., Bruner, E. C., Jr., Lites, B. W., Rottman, G. J., Orral, F. Q., Athay, R. G., and White, O. R.: 1976, Bull. Am. Astron. Soc. 8, 312.
Shine, R. A., Roussel-Dupré, D., Bruner, E. D., Jr., Chipman, E. G., Lites, B. W., Rottman, G. J., Athay, R. G., and White, O. R.: 1976, Astrophys. J. Letters 210, L107.
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Roussel-Dupré, D., Shine, R.A. Evidence of redshifts in the average solar line profiles of C iv and Si iv from OSO-8 observations. Sol Phys 77, 329–340 (1982). https://doi.org/10.1007/BF00156115
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DOI: https://doi.org/10.1007/BF00156115