Solar MURI, June 2003 H.S. Hudson Tracing SEPs from Earth to Sun H. Hudson.
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Transcript of Solar MURI, June 2003 H.S. Hudson Tracing SEPs from Earth to Sun H. Hudson.
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Solar MURI, June 2003H.S. Hudson
Tracing SEPs from Earth to Sun
H. Hudson
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Solar MURI, June 2003H.S. Hudson
Connectivity from particles
• The guiding-center motion of charged particles defines field-line location in a plasma (tiny Larmor radii; weak non-adiabaticity)
• SEP particles can move relativistically fast, and hence can “freeze” coronal structure to establish a connectivity reference
• Electrons are always semi-relativistic
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Solar MURI, June 2003H.S. Hudson
How to use the SEPs
• We have many SEP events, now with RHESSI identification of solar sources. From each we get some knowledge of the connectivity to a probe in the heliosphere
• Magnetic models based on PFSS theory are now readily available
• The heliospheric part of the propagation can be approached now from ballistic or better solar-wind models
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Solar MURI, June 2003H.S. Hudson
May 1, 1998 modeling
Schrijver-Derosa modeling for May 2, 1998
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Solar MURI, June 2003H.S. Hudson
May 12, 1997 modeling
Schrijver-Derosa modeling for May 12, 1997
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Solar MURI, June 2003H.S. Hudson
Schrijver-Derosa modeling for May 2, 1998
Before… … and after
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Solar MURI, June 2003H.S. Hudson
Pohjolainen et al., ApJ 556, 421 (2001)
SXT after minus before, May 2 1998
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Solar MURI, June 2003H.S. Hudson
Material from Nitta et al. poster
• This is the first work following the ideas outlined
• We will present further developments of it at the SHINE, ACERHESSIWind, and AGU meetings
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Solar MURI, June 2003H.S. Hudson
Finding the open fields
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Solar MURI, June 2003H.S. Hudson
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Solar MURI, June 2003H.S. Hudson
A PFSS Horror Story
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Solar MURI, June 2003H.S. Hudson
Which Parker spiral?
• Need to integrate the streamline of the SW flow to find a source-surface footpoint
• Zeroth approximation with constant speed
• First approximation via history of SW at probe
• MHD simulation