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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
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
Palabras clave:MHD; Solar wind; Sun: corona; Sun: magnetic fields; Sun: UV radiation
Año:2003
Volumen:598
Número:2 I
Página de inicio:1361
Página de fin:1374
DOI: http://dx.doi.org/10.1086/379008
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v598_n2I_p1361_Vasquez

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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