Abstract
Using empirical velocity distributions derived from UVCS and SUMER ultraviolet spectroscopy, we construct theoretical models of anisotropic ion temperatures in the polar solar corona. The primary energy deposition mechanism we investigate is the dissipation of high frequency (10-10000 Hz) ion-cyclotron resonant Alfvén waves which can heat and accelerate ions differently depending on their charge and mass. We find that it is possible to explain the observed high perpendicular temperatures and strong anisotropies with relatively small amplitudes for the resonant waves. There is suggestive evidence for steepening of the Alfvén wave spectrum between the coronal base and the largest heights observed spectroscopically. Because the ion-cyclotron wave dissipation is rapid, even for minor ions like O5+, the observed extended heating seems to demand a constantly replenished population of waves over several solar radii. This indicates that the waves are generated gradually throughout the wind rather than propagated up from the base of the corona.
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References
Banaszkiewicz, M., Axford, W. I., and McKenzie, J. F.: 1998, A&A, 337, 940.
Barakat, A. R., and Schunk, R. W.: 1981, J. Phys. D, 14, 421.
Cranmer, S. R., Field, G. B., and Kohl, J. L.: 1999a, Ap. J., 518, in press (20 June 1999).
Cranmer, S. R., et al.: 1999b, Ap. J., 511, 481.
Feldman, W. C., and Marsch, E.: 1997, in Cosmic Winds and the Heliosphere, ed. J. R. Jokipii, C. P. Sonett, and M. S. Giampapa (Tucson: University of Arizona Press), 617.
Goldstein, M. L., Roberts, D. A., and Matthaeus, W. H.: 1995, Ann. Rev. Astron. Astrophys., 33, 283.
Guhathakurta, M., and Holzer, T. E.: 1994, Ap. J., 426, 782.
Hassler, D. M., Wilhelm, K., Lemaire, P., and Sch¨uhle, U.: 1997, Solar Phys., 175, 375.
Hollweg, J. V., and Turner, J. M.: 1978, J. Geophys. Res., 83, 97.
Isenberg, P. A.: 1984, J. Geophys. Res., 89, 6613.
Isenberg, P. A., and Hollweg, J. V.: 1982, J. Geophys. Res., 87, 5023.
Ko, Y.-K., Fisk, L. A., Geiss, J., Gloeckler, G., and Guhathakurta, M.: 1997, Solar Phys., 171, 345.
Kohl, J. L., et al.: 1995, Solar Phys., 162, 313.
Kohl, J. L., et al.: 1997, Solar Phys., 175, 613.
Kohl, J. L., et al.: 1998a, Ap. J. Letters, 501, L127.
Kohl, J. L., et al.: 1998b, Ap. J. Letters, 510, L59.
Leamon, R. J., Smith, C.W., Ness, N. F., Matthaeus, W. H., and Wong, H. K.: 1998, J. Geophys. Res., 103, 4775.
Marsch, E., Goertz, C. K., and Richter, K.: 1982, J. Geophys. Res., 87, 5030.
Schwartz, S. J.: 1980, Rev. Geophys. Space Phys., 18, 313.
Spitzer, L., Jr.: 1962, Physics of Fully Ionized Gases, 2nd ed. (New York: Wiley).
Tu, C.-Y., and Marsch, E.: 1997, Solar Phys., 171, 363.
Tu, C.-Y., Marsch, E., Wilhelm, K., and Curdt, W.: 1998, Ap. J., 503, 475.
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Cranmer, S.R., Field, G.B. & Kohl, J.L. Spectroscopic Constraints on Models of Ion-cyclotron Resonance Heating in the Polar Solar Corona. Space Science Reviews 87, 149–152 (1999). https://doi.org/10.1023/A:1005142922406
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DOI: https://doi.org/10.1023/A:1005142922406