Abstract
This paper studies two properties of chromospheric spicules: their angular distribution and the plasma velocity along their axes. To investigate the first property, we measured the apparent tilt of spicules at the limb, and then computed their actual distribution in space. This was achieved by solving first kind Fredholm or Volterra integral equations by various methods. The distribution of the axial velocity of the spicule plasma was studied on the basis of two types of observations: (1) the height variation of the spicules as a function of time and (2) the Doppler shift of the spectral lines. The resulting velocity distributions, using the experimental data of these two sets of observations, are quite different. The average velocity based on the Doppler shift measurements (≈ 40 km s−1) is greater than that based on height variation of spicules (≈ 20 km s−1). This is due to the ionization of the material as it penetrates the corona.
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References
Alissandrakis, C. E.: 1973, Solar Phys. 32, 345.
Athay, R. G. and Bessey, R. J.: 1964, Astrophys. J. 140, 1174.
Beckers, J. M.: 1963, Astrophys. J. 138, 648.
Beckers, J. M.: 1968, Solar Phys. 3, 367.
Beckers, J. M.: 1972, Ann. Rev. Astron. Astrophys. 10, 73.
Bhavilai, R.: 1965, Monthly Notices Roy. Astron. Soc. 130, 411.
Bray, R. J. and Loughhead, R. E.: 1974, The Solar Chromosphere, Chapman and Hall, London.
Craig, I. J. D. and Brown J. C.: 1986, Inverse Problems in Astronomy, Adam Hilger Ltd, Bristol.
Dunn, R. B.: 1960, Thesis, Harvard University, Sacramento Peak Observatory Contribution, N087, 1965.
Grossman-Doerth, U. and von Uexküll, M.: 1971, Solar Phys. 20, 31.
Krasnov, M., Kisselev, A., and Makarenko, G.: 1977, Equations Integrales, Mir, Moscow.
Krat, V. A. and Krat, T. V.: 1971, Izv. Pulkovo Obs., No. 108, 529.
Kulidzanshivli, V. I.: 1986, Solar Phys. 106, 75.
Kulidzanshivli, V. I. and Nikolsky, G. M.: 1978, Solar Phys. 59, 21.
Lippincott, S. L.: 1957, Smithsonian Contribution to Astrophysics, No. 2.
Michard, R.: 1956, Ann. d'Astrophys. 19, 1.
Michard, R.: 1974, in R. G. Athay (ed.), ‘Chromospheric Fine Structure’, IAU Symp. 56, 3.
Mosher, J. M. and Pope, T. P.: 1977, Solar Phys. 53, 375.
Mouradian, Z.: 1962, Compte Rend. Acad. Sci. Paris 255, 3372.
Mouradian, Z.: 1965, Ann. d'Astrophys. 28, 805.
Pasachoff, J. M., Noyes, R. W., and Beckers, J. M.: 1968, Solar Phys. 5, 131.
Patterson, T. N. L.: 1968, Math. Comp. 22, 847.
Rush, J. H. and Roberts, W. O.: 1954, Australian J. Phys. 7, 230.
Tricomi, F. G.: 1957, Integral Equations, Intersciences Publ., New York.
Zirker, J. B.: 1967, Solar Phys. 1, 204.
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Heristchi, D., Mouradian, Z. On the inclination and the axial velocity of spicules. Sol Phys 142, 21–34 (1992). https://doi.org/10.1007/BF00156631
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DOI: https://doi.org/10.1007/BF00156631