Relationships Between Flares and CME’sMonday, 23 June 2008
•Monday, 23 June, 1:30pm, Grindelwald, we have 3 Invited speakers, plenty ofextra time for discussion.
•H.S. Hudson: Relationships Between Flares and CMEs:
“The relationships between flares and CMEs have been fraught with uncertainties in therecent past, but are now becoming observationally clearer. “
•K. K. Reeves: Theoretical Predictions of Energy Release in CMEs and Calculationsof Flare Emissions: ”Using an analytical loss-of-equilibrium model, we have calculatedthe energy release accompanying coronal mass ejections.”
•S. Krucker: Hard X-ray Emissions from the High Corona Associated with CMEs:“For flares occurring 20 or more degrees behind the solar limb, the main thermal andnon-thermal hard X-ray (HXR) flare emissions are occulted, and faint HXR emissionsfrom the high corona (>200 arcsec above flare site) can be investigated….”
SUMMARY: Relationships between Flares and CMEs
“Follow the energy to understand the physics” – H. Hudson
• Seems to be a reasonablecorrelation between flare energyand CME energy!
• But there are big CME events thathave almost no “flare” component
• So maybe the energy relationship isnot all that straight-forward… ?
SUMMARY: Relationships between Flares and CMEs
“Follow the energy to understand the physics” – H. Hudson
NLFFF excess
Potential
• Not clear that NLFFF energy is enough for observedparticle/xray/flare + CME energies…
• The changes are stepwise, of order 10% of the line-of-sight field, and primarily occur at the impulsive phaseof the flare
• Changes in LOS magnetogram field(s) may be relatedto change in tilt of field before/after flares
• All the energy forflares/CMEs very low in thesolar atmosphere
• Hugh’s talk requires a lotof “mental differentiation”
NLFFF excess
50% contour
SUMMARY: Relationships between Flares and CMEs
“Follow the energy to understand the physics” – H. Hudson
• There was this idea
“loops shrink before a flare”
but, the TRACE movie evidence showed thiswas a “certain model’s” breakout reconnectionflux-transfer to side-arcades prior to flare andthat, in fact, all the loops above filamenteruption go up…
Fletcher & Hudson 2008
• The Fletcher & Hudson 2008paper has “sluggish citation rate”
Not twist modes concentrating inflare-loop footpoints but non-linearAlfven waves resulting naturallyfrom reconnection region
SUMMARY: Relationships between Flares and CMEs
“Follow the energy to understand the physics” – H. Hudson
•A. Vourlidas showed STEREO movie showing Poynting flux into CS
SUMMARY: Relationships between Flares and CMEs
“Follow the energy to understand the physics” – H. Hudson
r0 = inner boundary (flare)r1 = outer boundary (CME)
• Forbes+Lin analytic model is “elegant andcomplicated” (not “simple”)
• Energy down is conductive flux
• Energy up is initially poynting flux (shearcomponent) then kinetic energy
• Impulsive phase, up:down energy partition
SUMMARY: Relationships between Flares and CMEs
“Follow the energy to understand the physics” – H. Hudson
• Basic flare picture more-or-lessstill okay…
• But, huge problem with theobservational/theoretical issue of:
Acceleration Particles Photons
“Tell me how many e- you need me toaccelerate and I’ll tell you that you need10X more…” –S. Krucker
If this is true for HXR footpoint sources…
• Now there are a handful of occulted flare events with HXR loop-top sources
all images taken at the same time
SUMMARY: Relationships between Flares and CMEs
“Follow the energy to understand the physics” – H. Hudson
pre-event SXR image
SUMMARY: Relationships between Flares and CMEs
“Follow the energy to understand the physics” – H. Hudson
• What is to be done?
(Today) SHINE Invited Talk 2: “Hard X-rays, Flares, and Particle Acceleration” –Markus Aschwanden
(Wed) WG2: Hard Xrays & Particle Accel, 10:30am
(Thurs) WG1: CME Dynamics, what are EUV-waves? 1:30pm
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• Energy Partition! How much goes where?! How much did we start with?
• Modelers should do the Reeves et al. analysis for their 3D current-sheets
• There ought to be a soln to this e- problem…
• Keep up the good work!