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Validation of a synoptic solar wind model
Gombosi, T. I.; Roussev, I. I.; Cohen, O. +1 more
We present a validation of a three-dimensional magnetohydrodynamic model for the solar corona and the inner heliosphere. We compare the results of the model with long-term satellite data at 1 AU for a 1 year period during solar minimum and another year period of solar maximum. Overall, the model predicts rather well the magnitude of the magnetohyd…
Kinematic properties of solar coronal mass ejections: Correction for projection effects in spacecraft coronagraph measurements
Howard, T. A.; Nandy, D.; Koepke, A. C.
One of the main sources of uncertainty in quantifying the kinematic properties of coronal mass ejections (CMEs) using coronagraphs is the fact that coronagraph images are projected into the sky plane, resulting in measurements which can differ significantly from their actual values. By identifying solar surface source regions of CMEs using X-ray a…
Plasmoids in reconnecting current sheets: Solar and terrestrial contexts compared
Farrugia, C. J.; Cranmer, S. R.; Lin, J.
Magnetic reconnection plays a crucial role in violent energy conversion occurring in the environments of high electrical conductivity, such as the solar atmosphere, magnetosphere, and fusion devices. We focus on the morphological features of the process in two different environments, the solar atmosphere and the geomagnetic tail. In addition to in…
Solar Mass Ejection Imager 3-D reconstruction of the 27-28 May 2003 coronal mass ejection sequence
Jackson, B. V.; Buffington, A.; Hick, P. P. +3 more
The Solar Mass Ejection Imager (SMEI) has recorded the inner-heliospheric response in white-light Thomson scattering for many hundreds of interplanetary coronal mass ejections (ICMEs). Some of these have been observed by the Solar and Heliospheric Observatory (SOHO) Large-Angle Spectroscopic Coronagraph (LASCO) instruments and also in situ by near…
Three-dimensional MHD modeling of the global corona throughout solar cycle 23
Wu, S. T.; Feng, X. S.; Song, W. B. +1 more
Based on the space-time conservation element and solution element (CESE) method, we have recently developed a novel 3D magnetohydrodynamic (MHD) model for the solar corona and interplanetary study. Our aim here is to describe the application of this new MHD model to study the global coronal magnetic structures by using the observed line-of-sight p…
Cyclic behavior of solar full-disk activity
Li, K. J.; Gao, P. X.; Li, Q. X. +1 more
In order to describe the cyclic behavior of solar full-disk activity (the surface magnetic fields, filaments, the green Fe XIV, 5303Å corona local maxima intensities, and torsional oscillations), we propose a new concept, a "full-disk activity cycle," which consists of two successive normal cycles: a high-latitude activity cycle following a low-la…
Interplanetary coronal mass ejections that are undetected by solar coronagraphs
Simnett, G. M.; Howard, T. A.
From February 2003 to September 2005 the Solar Mass Ejection Imager on the Coriolis spacecraft detected 207 interplanetary coronal mass ejections (ICME) in the inner heliosphere. We have examined the data from the Large Angle Spectroscopic Coronagraph (LASCO) on the SOHO spacecraft for evidence of coronal transient activity that might have been th…
Posteruptive phenomena in coronal mass ejections and substorms: Indicators of a universal process?
Webb, D. F.; Wiltberger, M.; Schwadron, N. A. +8 more
We examine phenomena associated with eruptions in the two different regimes of the solar corona and the terrestrial magnetosphere. We find striking similarities between the speeds of shrinking magnetic field lines in the corona and dipolarization fronts traversing the magnetosphere. We also examine the similarities between supra-arcade downflows o…
MHD simulations of the global solar corona around the Halloween event in 2003 using the synchronic frame format of the solar photospheric magnetic field
Liu, Yang; Hayashi, Keiji; Zhao, Xue Pu
We performed two time-relaxation magnetohydrodynamics (MHD) simulations of the solar corona: one uses the boundary map representing the solar surface magnetic field distribution before the Halloween event in 2003, and the other uses map representing the postevent distribution. The aims of this study are to test a new concept of a solar surface mag…
Predicting interplanetary shock arrivals at Earth, Mars, and Venus: A real-time modeling experiment following the solar flares of 5-14 December 2006
Barabash, S.; Lundin, R.; Futaana, Y. +12 more
A 3-D, kinematic, solar wind model (Hakamada-Akasofu-Fry version 2 (HAFv.2)) is used to predict interplanetary shock arrivals at Venus, Earth, and Mars during a sequence of significant solar events that occurred in the interval 5-14 December 2006. Mars and Venus were on the opposite side of the Sun from Earth during this period. The shocks from th…