Zobrazeno 1 - 10
of 89
pro vyhledávání: '"Habbal, Shadia Rifai"'
Potential Field Source Surface (PFSS) models are widely used to simulate coronal magnetic fields. PFSS models use the observed photospheric magnetic field as the inner boundary condition and assume a perfectly radial field beyond a ``Source Surface"
Externí odkaz:
http://arxiv.org/abs/2408.16149
Publikováno v:
Astrophysical Journal; 10/20/2024, Vol. 974 Issue 2, p1-15, 15p
In the applications of solar magneto-seismology(SMS), employing the ratio of the period of the fundamental mode to twice the one of its first overtone, $P_1/2P_2$, plays an important role. We examine how field-aligned flows affect the dispersion prop
Externí odkaz:
http://arxiv.org/abs/1303.1689
Autor:
Li, Bo, Habbal, Shadia Rifai
How the solar wind is accelerated to its supersonic speed is intimately related to how it is heated. Mechanisms based on ion-cyclotron resonance have been successful in explaining a large number of observations, those concerning the significant ion t
Externí odkaz:
http://arxiv.org/abs/1211.7136
Autor:
Richie-Halford, Adam C., Iess, Luciano, Tortora, Paolo, Armstrong, John W., Asmar, Sami W., Woo, Richard, Habbal, Shadia Rifai, Morgan, Huw
Publikováno v:
Space Weather, 7, S12003
Radio remote sensing of the heliosphere using spacecraft radio signals has been used to study the near-sun plasma in and out of the ecliptic, close to the sun, and on spatial and temporal scales not accessible with other techniques. Studies of space-
Externí odkaz:
http://arxiv.org/abs/1003.3848
Publikováno v:
Astrophys.J.661:593-601,2007
The effect of solar rotation on the proton-alpha differential flow speed, $v_{\alpha p}$, and consequently on the angular momentum transport in the solar wind, is explored. It is found that the force introduced by the azimuthal components plays an im
Externí odkaz:
http://arxiv.org/abs/astro-ph/0702380
Sunspots are locations on the Sun where unique atmospheric conditions prevail. In particular, the very low temperatures found above sunspots allow the emission of H_2 lines. In this study we are interested in the radiation emitted by sunspots in the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0611490
The very sharp decrease of density with heliocentric distance makes imaging of coronal density structures out to a few solar radii challenging. The radial gradient in brightness can be reduced using numerous image processing techniques, thus quantita
Externí odkaz:
http://arxiv.org/abs/astro-ph/0602174
Autor:
Morgan, H., Habbal, Shadia Rifai
Publikováno v:
Astrophys.J. 630 (2005) L189
Due to their high intensity of emission in the O VI 1031.9 and 1037.6A lines, even small sunspots on the solar disk can strongly influence the intensity of the radiative scattering component of O VI lines in the corona. Observations of O VI disk spec
Externí odkaz:
http://arxiv.org/abs/astro-ph/0602176
Recent observations of the spectral line profiles and intensity ratio of the O VI 1032 {\AA} and 1037.6 {\AA} doublet by the Ultraviolet Coronagraph Spectrometer (UVCS) on the Solar and Heliospheric Observatory (SOHO), made in coronal holes below 3.5
Externí odkaz:
http://arxiv.org/abs/astro-ph/9805021