Show simple item record Vasquez, Alberto Marcos van Ballegooijen, Adriaan A. Raymond, John C. 2017-07-24T18:29:26Z 2003-12-01
dc.identifier.citation Vasquez, Alberto Marcos; van Ballegooijen, Adriaan A.; Raymond, John C.; The Effect of Proton Temperature Anisotropy on the Solar Minimum Corona and Wind; IOP Publishing; Astrophysical Journal; 598; 2; 1-12-2003; 1361-1374
dc.identifier.issn 0004-637X
dc.description.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 ¼ ck) 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 onmonotonic behavior of the nonradial expansion factor in flow tubes that pass near the streamer cusp. In the slow wind, the plasma 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 O5þ Doppler dimming measurements from UVCS/ SOHO. We also find good agreement with polarized brightness ( pB) measurements from LASCO/SOHO and H i Ly images from UVCS/SOHO.
dc.format application/pdf
dc.language.iso eng
dc.publisher IOP Publishing
dc.rights info:eu-repo/semantics/openAccess
dc.subject.classification Astronomía
dc.subject.classification Ciencias Físicas
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title The Effect of Proton Temperature Anisotropy on the Solar Minimum Corona and Wind
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion 2017-07-24T14:12:57Z
dc.journal.volume 598
dc.journal.number 2
dc.journal.pagination 1361-1374
dc.journal.pais Reino Unido
dc.journal.ciudad Londres
dc.description.fil Fil: Vasquez, Alberto Marcos. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil Fil: van Ballegooijen, Adriaan A.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil Fil: Raymond, John C.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.journal.title Astrophysical Journal
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dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/

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