Difference between revisions of "Working Group 5"

From heliophysics
Jump to: navigation, search
Line 1: Line 1:
This page is a summary of the work of Working Group 5  (WG5) led by Spiros Patsourakos (Greece). WG5 is dedicated to predicting the southern magnetic field component of CMEs.
+
This page is a summary of Working Group 5  (WG5) led by Spiros Patsourakos (Greece). WG5 is dedicated to predicting the southern magnetic field component of CMEs.
  
 
----
 
----
Line 5: Line 5:
  
 
=='''WG5 Statement'''==
 
=='''WG5 Statement'''==
The presence of southward magnetic fields in ICMEs are
+
The presence of southward magnetic fields (Bs) in ICMEs is
 
the most important factor in producing geomagnetic storms.
 
the most important factor in producing geomagnetic storms.
The challenge is that direct observations of magnetic fields near the Sun
+
The challenge is that direct observations of the magnetic field vectors near the Sun
 
are extremely limited: currently possible only in the
 
are extremely limited: currently possible only in the
 
photosphere/chromosphere
 
photosphere/chromosphere
at the solar end and by in-situ observations at 1 AU.
+
in the solar end and by in-situ observations at 1 AU.
WG5 aims to understand and reconstruct the possible flux
+
WG5 aims to understand and reconstruct the possible magnetic flux
rope magnetic structure
+
rope structure
 
of CMEs/ICMEs from observations and models. It also aims to
 
of CMEs/ICMEs from observations and models. It also aims to
predict the intensity and the duration of of the Bs in ICMEs
+
predict the intensity and possibly the duration of the Bs in ICMEs
upon arriving at the Earth.
+
upon arrival at Earth.
  
 
----
 
----
Line 21: Line 21:
 
=='''Methodology'''==
 
=='''Methodology'''==
  
* Deduce near-Sun |B| of CMEs (e.g., radio, flux-rope model, magnetic helicity, CME-driven shocks)
+
* Deduce/estimate near-Sun |B| of CMEs (e.g., radio, flux-rope model, magnetic helicity, CME-driven shocks)
 
* Deduce near-Sun orientation of CMEs (e.g., geometrical CME modeling)
 
* Deduce near-Sun orientation of CMEs (e.g., geometrical CME modeling)
* Propagate near-Sun |B| to 1 AU (theoretical/observational scaling-laws, MHD modeling)
+
* Propagate near-Sun |B| to 1 AU (e.g., theoretical/observational scaling-laws, MHD modeling)
 
* Propagate near-Sun orientation to 1 AU (MHD modeling)
 
* Propagate near-Sun orientation to 1 AU (MHD modeling)
 
* Compare predictions with observations at 1 AU (MC fitting)
 
* Compare predictions with observations at 1 AU (MC fitting)
Line 31: Line 31:
 
==='''Preliminary Work Plan'''===
 
==='''Preliminary Work Plan'''===
 
----
 
----
* 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)
+
* 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 various team members ----coordinate w/ the data and campaign WGs (yrs 1-2)
 
* Assess the pros & cons of the various methods of near-Sun |B| determination -- coordinate w/ the theory and modeling WGs (yrs 1-2)
 
* Assess the pros & cons of the various methods of near-Sun |B| determination -- coordinate w/ the theory and modeling WGs (yrs 1-2)
 
* Apply methods (existing or improved) to a sample of CMEs and determine near-Sun |B| -> paper and list of events/data (yrs 2-3)
 
* Apply methods (existing or improved) to a sample of CMEs and determine near-Sun |B| -> paper and list of events/data (yrs 2-3)
Line 40: Line 40:
 
==='''Current Action Items'''===
 
==='''Current Action Items'''===
 
----
 
----
* Prepare a list of CMEs of which their near-Sun magnetic field has been already been deduced, by at least one method.   
+
* 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.  
+
<b> Please fill in the table below by the end of February 2015. </b> Events that you also plan to deduce  their magnetic fields could be also included in the table.  
 
[[List of CMEs for WG5 Analysis]]
 
[[List of CMEs for WG5 Analysis]]
  
  
 
----
 
----

Revision as of 14:21, 20 December 2014

This page is a summary of Working Group 5 (WG5) led by Spiros Patsourakos (Greece). WG5 is dedicated to predicting the southern magnetic field component of CMEs.



WG5 Statement

The presence of southward magnetic fields (Bs) in ICMEs is the most important factor in producing geomagnetic storms. The challenge is that direct observations of the magnetic field vectors near the Sun are extremely limited: currently possible only in the photosphere/chromosphere in the solar end and by in-situ observations at 1 AU. WG5 aims to understand and reconstruct the possible magnetic flux rope structure of CMEs/ICMEs from observations and models. It also aims to predict the intensity and possibly the duration of the Bs in ICMEs upon arrival at Earth.


Methodology

  • Deduce/estimate near-Sun |B| of CMEs (e.g., radio, flux-rope model, magnetic helicity, CME-driven shocks)
  • Deduce near-Sun orientation of CMEs (e.g., geometrical CME modeling)
  • Propagate near-Sun |B| to 1 AU (e.g., theoretical/observational scaling-laws, MHD modeling)
  • Propagate near-Sun orientation to 1 AU (MHD modeling)
  • Compare predictions with observations at 1 AU (MC fitting)

Preliminary Work Plan


  • Find suitable datasets for near-Sun |B| field calculations applicable to as many of the available methods as possible --- start with events already analysed by various team members ----coordinate w/ the data and campaign WGs (yrs 1-2)
  • Assess the pros & cons of the various methods of near-Sun |B| determination -- coordinate w/ the theory and modeling WGs (yrs 1-2)
  • Apply methods (existing or improved) to a sample of CMEs and determine near-Sun |B| -> paper and list of events/data (yrs 2-3)
  • 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)

Current Action Items


  • Prepare a list of CMEs of which their near-Sun magnetic field has been already been deduced by at least one method.

Please fill in the table below by the end of February 2015. Events that you also plan to deduce their magnetic fields could be also included in the table. List of CMEs for WG5 Analysis