Abstract:
A semiempirical, axisymmetric model of the solar minimum corona is developed by solving the equations for conservation of mass and momentum with prescribed anisotropic temperature distributions. In the high-latitude regions, the proton temperature anisotropy is strong and the associated mirror force plays an important role in driving the fast solar wind; the critical point where the outflow velocity equals the parallel sound speed (v = c ∥) is reached already at 1.5 R⊙ from Sun center. The slow wind arises from a region with open-field lines and weak anisotropy surrounding the equatorial streamer belt. The model parameters were chosen to reproduce the observed latitudinal extent of the equatorial streamer in the corona and at large distance from the Sun. We find that the magnetic cusp of the closed-field streamer core lies at about 1.95 R⊙. The transition from fast to slow wind is due to a decrease in temperature anisotropy combined with the nonmonotonic behavior of the nonradial expansion factor in flow tubes that pass near the streamer cusp. In the slow wind, the plasma β is of order unity and the critical point lies at about 5 R ⊙, well beyond the magnetic cusp. The predicted outflow velocities are consistent with O5+ Doppler dimming measurements from UVCS/SOHO. We also find good agreement with polarized brightness (pB) measurements from LASCQ/SOHO and H I Lyα images from UVCS/SOHO.
Registro:
Documento: |
Artículo
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Título: | The effect of proton temperature anisotropy on the solar minimum corona and wind |
Autor: | Vásquez, A.M.; Van Ballegooijen, A.A.; Raymond, J.C. |
Filiación: | Harvard-Smithsonian Ctr. Astrophys., MS 15, 60 Garden Street, Cambridge, MA 02138, United States Inst. de Astron./Fis. del Espacio, Casilla de Correo 67, Succursale 28, 1428 Buenos Aires, Argentina
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Palabras clave: | MHD; Solar wind; Sun: corona; Sun: magnetic fields; Sun: UV radiation |
Año: | 2003
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Volumen: | 598
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Número: | 2 I
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Página de inicio: | 1361
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Página de fin: | 1374
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DOI: |
http://dx.doi.org/10.1086/379008 |
Título revista: | Astrophysical Journal
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Título revista abreviado: | Astrophys. J.
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ISSN: | 0004637X
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v598_n2I_p1361_Vasquez |
Referencias:
- Allen, C.W., (1973) Astrophysical Quantities, , London: Athlone
- Allen, L.A., Habbal, S.R., Hu, Y.Q., (1998) J. Geophys. Res., 103, p. 6551
- Chen, Y., Hu, Y.Q., (2001) Sol. Phys., 199, p. 371
- (2002) Ap&SS, 282, p. 447
- Cranmer, S.R., (2002) Proc. 11th SOHO Symp., from Solar Min to Max: Half a Solar Cycle with SOHO, p. 361. , ed. A. Wilson (ESA SP-508; Noordwijk: ESA)
- Cranmer, S.R., (1999) ApJ, 511, p. 481
- Cuperman, S., Bruma, C., Detman, T., Dryer, M., (1993) ApJ, 404, p. 356
- Cuperman, S., Ofman, L., Dryer, M., (1990) ApJ, 350, p. 846
- Doorzycka, D., Cranmer, S.R., Panasyuk, A.V., Strachan, L., Kohl, J.L., (1999) J. Geophys. Res., 104, p. 9791
- Dusenbery, P.B., Hollweg, J.V., (1981) J. Geophys. Res., 86, p. 153
- Frazin, R.A., (2002), Ph.D. thesis, Univ. Illinois, Urbana-Champaign; Frazin, R.A., Cranmer, S.R., Kohl, J.L., (2003) ApJ, 597, p. 1145
- Gibson, S.E., (2001) Space Sci. Rev., 97, p. 69
- Gibson, S.E., Fludra, A., Bagenal, F., Biesecker, D., Del Zanna, G., Bromage, B., (1999) J. Geophys. Res., 104, p. 9691
- Guhathakurta, M., Fludra, A., Gibson, S.E., Biesecker, D., Fisher, R., (1999) J. Geophys. Res., 104, p. 9801
- Guhathakurta, M., Holzer, T.E., Macqueen, R.M., (1996) ApJ, 458, p. 817
- Habbal, S.R., Woo, R., Fineschi, S., O'Neal, R., Kohl, J., Noci, G., Korendyke, C., (1997) ApJ, 489, pp. L103
- Hu, Y.Q., Habbal, S.R., (1999) J. Geophys. Res., 104, p. 17045
- Hummer, D.G., (1994) MNRAS, 268, p. 109
- Isenberg, P.A., Hollweg, J.V., (1983) J. Geophys. Res., 88, p. 3293
- Ko, Y.-K., Fisk, L.A., Geiss, J., Gloeckler, G., Guhathakurta, M., (1997) Sol. Phys., 171, p. 345
- Kohl, J.L., Strachan, L., Gardner, L.D., (1996) ApJ, 465, pp. L141
- Kohl, J.L., (1995) Sol. Phys., 162, p. 313
- (1997) Sol. Phys., 175, p. 613
- (1998) ApJ, 501, pp. L127
- Landi, E., Doron, R., Feldman, U., Doschek, G.A., (2001) ApJ, 556, p. 912
- Li, J., Raymond, J.C., Acton, L.W., Kohl, J.L., Romoli, M., Noci, G., Naletto, G., (1998) ApJ, 506, p. 431
- Linker, J.A., Van Hoven, G., Schnack, D.D., (1990) J. Geophys. Res., 17, p. 2281
- Lionello, R., Linker, J.A., Mikic, Z., (2001) ApJ, 546, p. 542
- Low, B.C., (1986) ApJ, 310, p. 953
- Marsh, E., Muhlhauser, K.-H., Rosenbauer, H., Schwenn, R., Neubauer, F.M., (1982) J. Geophys. Res., 86, p. 9199
- Munro, R.H., Jackson, B.V., (1977) ApJ, 213, p. 874
- Newkirk Jr., G.A., (1967) ARA&A, 5, p. 213
- Noci, G., Kohl, J.L., Withbroe, G.L., (1987) ApJ, 315, p. 706
- Noci, G., (1997) Proc. Fifth SOHO Workshop: The Corona and Solar Wind Near Minimum Activity, p. 75. , ed. A. Wilson (ESA SP-404;Noordwijk: ESA)
- Olsen, E.L., Leer, E., (1996) ApJ, 462, p. 982
- Olsen, E.L., Leer, E., (1996) ApJ, 462, p. 982
- Olsen, E.L., Leer, E., Holzer, T., (1994) ApJ, 420, p. 913
- Phillips, J.L., (1995) Geophys. Res. Lett., 22, p. 3301
- Pilipp, W.G., Muehlhaeuser, K.-H., Miggenrieder, H., Montgomery, M.D., Rosenbauer, H., (1987) J. Geophys. Res., 92, p. 1075
- Pneuman, G., Kopp, R.A., (1971) Sol. Phys., 18, p. 258
- Press, W.H., Teucholsky, S.A., Vetterling, W.T., Flannery, B.P., (1992) Numerical Recipes in Fortran: The Art of Scientific Computing (2 Ed.), p. 413. , Cambridge: Cambridge Univ. Press
- Raymond, J.C., (1997) Sol. Phys., 175, p. 645
- Riley, P., Linker, J.A., Mikic, Z., (2001) J. Geophys. Res., 106, p. 15889
- Saito, K., Poland, A.I., Munro, R.H., (1977) Sol. Phys., 55, p. 121
- Scholz, T.T., Walters, H.R.J., (1991) ApJ, 380, p. 302
- Sheeley Jr., N.R., (1997) ApJ, 484, p. 472
- Sittler Jr., E.C., Guhathakurta, M., (1999) ApJ, 523, p. 812
- Steinolfson, R.S., Suess, S.T., Wu, S.T., (1982) ApJ, 255, p. 730
- Strachan, L., Suleiman, R., Panasyuk, A.V., Biesecker, D.A., Kohl, J.L., (2002) ApJ, 571, p. 1008
- Suess, S.T., Gary, G.A., Nerney, S.F., (1999) AIP Conf. Proc., 471, p. 247. , Solar Wind Nine, ed. S. R. Habbal, R. Esser, J. V. Hollweg, & P. A. Isenberg (Woodbury: AIP)
- Suess, S.T., Nerney, S.F., (1999) Proc. 9th European Meeting on Solar Physics, Magnetic Fields, and Solar Processes, p. 1101. , ed. A. Wilson (ESA SP-44; Noordwijk: ESA)
- (2002) ApJ, 565, p. 1275
- Suess, S.T., Poletto, G., Corti, G., Simnett, G., Noci, G., Romoli, R., Kohl, J., Goldstein, B., (1999) Space Sci. Rev., 87, p. 319
- Sùess, S.T., Wang, A.-H., Wu, S.T., (1996) J. Geophys. Res., 101, p. 19957
- Tu, C.-Y., Marsch, E., (1997) Sol. Phys., 171, p. 363
- Van de Hulst, H.C., (1950) Bull. Astron. Inst. Netherlands, 11, p. 135
- Vásquez, A.M., Raymond, J.C., Van Ballegooijen, A.A., (1999) Space Sci. Rev., 87, p. 335
- Vásquez, A.M., Van Ballegooijen, A.A., Raymond, J.C., (1999) AIP Conf. Proc., 471, p. 243. , Solar Wind Nine, ed, S. R. Habbal, R. Esser, J. V. Hollweg, & P. A. Isenberg (Woodbury: AIP)
- Wang, A.H., Wu, S.T., Suess, S.T., Poletto, G., (1993) Sol. Phys., 147, p. 55
- (1998) J. Geophys. Res., 103, p. 1913
- Wang, Y.-M., (1994) ApJ, 437, pp. L67
- Wang, Y.-M., Sheeley Jr., N.R., (1990) ApJ, 355, p. 726
- Wang, Y.-M., Sheeley Jr., N.R., Phillips, J.L., Goldstein, B.E., (1997) ApJ, 488, pp. L51
- Wang, Y.-M., (1997) ApJ, 485, p. 875
- (1998) ApJ, 498, pp. L165
- Washimi, H., Yoshino, Y., Ogino, T., (1987) J. Geophys. Res., 14, p. 487
- Wilhelm, K., Marsch, E., Dwivedi, B.N., Hassler, D.M., Lemaire, Ph., Gabriel, A.H., Huber, M.C.E., (1998) ApJ, 500, p. 1023
- Withbroe, G.L., Kohl, J.L., Weiser, H., Munro, R.H., (1982) Space Sci. Rev., 33, p. 17
- Yeh, T., Pneuman, G.W., (1977) Sol. Phys., 54, p. 419
Citas:
---------- APA ----------
Vásquez, A.M., Van Ballegooijen, A.A. & Raymond, J.C.
(2003)
. The effect of proton temperature anisotropy on the solar minimum corona and wind. Astrophysical Journal, 598(2 I), 1361-1374.
http://dx.doi.org/10.1086/379008---------- CHICAGO ----------
Vásquez, A.M., Van Ballegooijen, A.A., Raymond, J.C.
"The effect of proton temperature anisotropy on the solar minimum corona and wind"
. Astrophysical Journal 598, no. 2 I
(2003) : 1361-1374.
http://dx.doi.org/10.1086/379008---------- MLA ----------
Vásquez, A.M., Van Ballegooijen, A.A., Raymond, J.C.
"The effect of proton temperature anisotropy on the solar minimum corona and wind"
. Astrophysical Journal, vol. 598, no. 2 I, 2003, pp. 1361-1374.
http://dx.doi.org/10.1086/379008---------- VANCOUVER ----------
Vásquez, A.M., Van Ballegooijen, A.A., Raymond, J.C. The effect of proton temperature anisotropy on the solar minimum corona and wind. Astrophys. J. 2003;598(2 I):1361-1374.
http://dx.doi.org/10.1086/379008