Abstract
Results of a detailed study on supergranule lifetime and velocity fields are presented. We show the correlation between the observed downdraft velocity and the network magnetic flux elements on the quiet sun. After excluding areas with magnetic flux density ≥ 25 G, we find that the upper limit of the supergranule vertical speed is 0.1 km s−1 for both downdraft and updraft, and the r.m.s. speed is 0.03 km s−1. By observing the evolution of individual supergranules, we find that the average lifetime of supergranules might be ≥ 50 hours. We describe different ways of formation and decay of supergranular cells. New cells usually form in an area containing no pre-existing supergranule velocity fields. Cells may disappear in two ways: fragmentation and fading away.
Similar content being viewed by others
References
Antia, H. M., Chitre, S. M., and Pandey, S. K.: 1981, Solar Phys. 70, 67.
Chou, D., LaBonte, B. J., Braun, D. C., and Duvall, T. L.: 1989, in preparation.
Deubner, F. L.: 1971, Solar Phys. 17, 6.
Duvall, T. L.: 1980, Solar Phys. 66, 213.
Frazier, E. N.: 1970, Solar Phys. 14, 89.
Giovanelli, G. R.: 1980, Solar Phys. 67, 211.
Hart, A. B.: 1954, Monthly Notices Roy. Astron. Soc. 114, 2.
Hart, A. B.: 1956, Monthly Notices Roy. Astron. Soc. 116, 38.
Janssens, T. J.: 1970, Solar Phys. 11, 222.
Kubičela, A.: 1976, Solar Phys. 47, 551.
Leighton, R. B. 1957, Publ. Astron. Soc. Pacific 69, 497.
Leighton, R. B. 1964, Astrophys. J. 140, 1547.
Leighton, R. B. 1969, Astrophys. J. 156, 1.
Leighton, R. B., Noyes, R. W., and Simon, G. W.: 1962, Astrophys. J. 135, 474.
Livingston, W. C. and Orrall, F. Q.: 1974, Solar Phys. 39, 301.
Livingston, W. C., Harvey, J., Pierce, A. K., Schrage, D., Gillespie, B., Simmons, J., and Slaughter, C.: 1976a, Applied Opt. 15, 33.
Livingston, W. C., Harvey, J., Slaughter, C., and Trumbo, D.: 1976b, Applied Opt. 15, 40.
Martin, S. F.: 1988, Solar Phys. 117, 231.
Mosher, J.: 1976a, BBSO Preprint No. 159.
Mosher, J.: 1976b, Ph.D. Thesis, California Institute of Technology.
Musman, S. and Rust, D. M.: 1970, Solar Phys. 13, 261.
November, L. J., Toomre, J., and Gebbie, K. B.: 1981, Astrophys. J. 245, L123.
November, L. J., Toomre, J., Gebbie, K. B., and Simon, G. W.: 1982, Astrophys. J. 258, 846.
Rogers, E. H.: 1970, Solar Phys. 13, 57.
Shi, Z., Wang, J., and Patterson, A.: 1986, BBSO Preprint No. 257.
Skumanich, A., Smythe, C., and Frazier, E. N.: 1975, Astrophys. J. 200, 747.
Simon, G. W. and Leighton, R. B.: 1964, Astrophys. J. 140, 1120.
Smithson, R. C.: 1973, Solar Phys. 29, 365.
Stenflo, J. O., Harvey, J. W., Brault, J. W., and Solanki, S.: 1984, Astron. Astrophys. 131, 333.
Wang, H.: 1988, Solar Phys. 116, 1.
Wang, H. and Zirin, H.: 1988, Solar Phys. 115, 205.
Worden, S. P. and Simon, G. W.: 1976, Solar Phys. 46, 73.
Zirin, H.: 1985, Australian J. Phys. 38, 961.
Zirin, H.: 1987, Solar Phys. 110, 101.
Zirin, H.: 1989, in preparation.
Zirin, H. and Wang, H.: 1987, Presentation in AAS Solar Physics Division Meeting, May 13–15, 1987, Honolulu.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Wang, H., Zirin, H. Study of supergranules. Sol Phys 120, 1–17 (1989). https://doi.org/10.1007/BF00148532
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00148532