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| − | This page is a summary of the work by Working Group 5, dedicated to predicting the southern magnetic field component of CMEs.
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| − | =='''WG5 Statement'''==
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| − | The presence of southward magnetic fields in ICMEs are
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| − | the most important factor in producing geomagnetic storms.
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| − | The challenge is that direct observations of magnetic fields near the Sun
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| − | are extremely limited: currently possible only in the
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| − | photosphere/chromosphere
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| − | at the solar end and by in-situ observations at 1 AU.
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| − | WG5 aims to understand and reconstruct the possible flux
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| − | rope magnetic structure
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| − | of CMEs/ICMEs from observations and models. It also aims to
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| − | predict the intensity and the duration of of the Bs in ICMEs
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| − | upon arriving at the Earth.
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| − | =='''Methodology'''==
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| − | * Deduce near-Sun |B| of CMEs (e.g., radio, flux-rope model, magnetic helicity, CME-driven shocks)
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| − | * Deduce near-Sun orientation of CMEs (e.g., geometrical CME modeling)
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| − | * Propagate near-Sun |B| to 1 AU (theoretical/observational scaling-laws, MHD modeling)
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| − | * Propagate near-Sun orientation to 1 AU (MHD modeling)
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| − | * Compare predictions with observations at 1 AU (MC fitting)
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| − | ==='''Preliminary Work Plan'''===
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| − | * Find suitable datasets for near-Sun |B| field calculations applicable to as many of the available methods as possible --- <b> start with events already analysed </b> by the various team members ----coordinate w/ the data and campaign WGs (yrs 1-2)
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| − | * Assess the pros & cons of the various methods of near-Sun |B| determination -- coordinate w/ the theory and modeling WGs (yrs 1-2)
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| − | * Apply methods (existing or improved) to a sample of CMEs and determine near-Sun |B| -> paper and list of events/data (yrs 2-3)
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| − | * Extrapolate near-Sun |B| & orientation to 1 AU and compare w/ in-situ measurements and MC fittings ->paper and tables of pertinent data (yrs 3-4)
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| − | ==='''Current Action Items'''===
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| − | * Prepare a list of CMEs of which their near-Sun magnetic field has been already been deduced, by at least one method. <b> Please fill in the table below by end of January 2015. </b> Events that you also plan to analyze their magnetic fields could be also included in the table. [[List of CMEs for WG5 Analysis]]
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