The evolution of a coronal streamer prior to mass ejection
| Autor: | Rainer M. E. Illing, Richard Wolfson, C. W. S. Conover |
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| Rok vydání: | 1987 |
| Předmět: |
Atmospheric Science
Soil Science Flux Astrophysics Aquatic Science Oceanography Solar prominence symbols.namesake Current sheet Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Astrophysics::Solar and Stellar Astrophysics Earth-Surface Processes Water Science and Technology Physics Ecology Solar flare Paleontology Forestry Helmet streamer Solar physics Magnetic field Geophysics Space and Planetary Science Physics::Space Physics symbols Lorentz force |
| Zdroj: | Journal of Geophysical Research. 92:13641 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/ja092ia12p13641 |
| Popis: | A model describing the quasi-static evolution of a coronal helmet streamer as it is inflated with excess mass was developed. The model produces a sequence of magnetostatic equilibria for a magnetic field configuration that includes a current sheet in the equatorial plane as well as distributed volume currents. The equilibrium solutions are given as Legendre series, and the height at which the current sheet starts is adjusted iteratively to maintain constant flux in the closed-field region. The model was fit to SMM coronagraph/polarimeter observations showing the slow growth of a coronal streamer prior to its disruption in association with an eruptive prominence and mass ejection on August 18, 1980. The results suggest that the early phase of this event is consistent with the quasi-static evolution of the corona in response to the slow addition of mass to the closed-field region of the streamer. |
| Databáze: | OpenAIRE |
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