SEP EVENTS AND THE ROLE OF FLARES AND SHOCKS

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SEP EVENTS AND THE ROLE OF FLARES AND SHOCKS

• Hilary Cane, Ian Richardson and
• Tycho von Rosenvinge
• Astroparticle Physics Laboratory,
• NASA/GSFC

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PROPOSED STUDIES

• 1 Event Profiles
• 2 Interplanetary Shock Evolution
• 3 Early Component of SEP Events
• 4 Particle Characteristics at In Situ Shocks

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From Cane and Lario (2006)
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INTERPLANETARY CORONAL MASS EJECTION
ICME
SHOCK
SUN
CANE and RICHARDSON
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SHOCK NORMALS IMF
Volkmer and Neubauer 1984
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TYPE II
IP TYPE II EVENT
2300 UT 2330 UT
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m-? type II
Gopalswamy 2006
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SEP EVENTS AND THE ROLE OF FLARES AND SHOCKS

• Hilary Cane, Ian Richardson and
• Tycho von Rosenvinge
• Astroparticle Physics Laboratory,
• NASA/GSFC

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THREE PHASES OF PARTICLE ACCELERATION
FLARE IMPULSIVE PHASE (FIRST) FLARE LATE
PHASE (SECOND)
SHOCK
CME
SHOCK ACCELERATION THIRD PHASE
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TWO CONDITIONS for detecting particles in IP space
(1) OPEN FIELD LINES (2) MAGNETIC
CONNECTION


LOW FREQUENCY RADIO OBSERVATIONS PROVIDE THE
ANSWERS!
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ERUPTING LOOP PLUS RECONNECTION 1st
phase Available magnetic energy plus magnetic
structure of photosphere and corona
IMPULSIVE
Very Low No CME
Low Jet
Low/medium Small CME
Medium/large Medium/large CME
Shock?
Efficient late/extended phase acceleration?
Yes
Yes 2nd phase
Open Field Lines?
Open Field Lines?
No
No
Yes
Open Field Lines?
V. Good magnetic connect-ion
No
No
Yes
No SEP
Connection?
Yes
Connection?
No
No
Poor
Poor
No SEP
Yes
Good
Very good
No SEP
No SEP
OK
Fe-rich, Electron-rich (possibly 3He-rich
He-rich) SEP event PLUS late Fe-coronal
component Type III and Type II burst
3He-rich, Fe-rich, He-rich, Electron-rich SEP
event Type III burst
Fe-rich, Electron-rich SEP event Type III (and
Type II burst)
Aug 14 2002
May 1 2000
Sep 17 2002
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ERUPTING LOOP PLUS RECONNECTION 1st
phase Available magnetic energy plus magnetic
structure of photosphere and corona
GRADUAL
Strong Shock?
Connection?
Open Field Lines?
Yes 3rd phase
Yes
Very poor
No
Open Field Lines?
No
Good
Passing Shock Or CIR?
Aug 9 2001
Connection?
Jan 8 2002
Yes
Yes
No
No
Oct 1 2001
Fe-coronal or Fe-poor event
No SEP
Yes
3rd phase maybe 2nd phase but no 1st phase
No

Low energy Fe-coronal late event Possibly type I
Reasonably Fe-rich event (Type III), type III-l,
(II,IV)
Fe-rich early component at low and high
energies Fe-coronal/Fe-poor component later (Type
III), type III-l, (II,IV)
DSF events
Sep 15 2001
Major events
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FIRST PHASE ONLY Prompt particles Fe and e - rich
ACE ULEIS / SIS ions
MAY 2000
eras
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THIRD PHASE ONLY DISAPPEARING FILAMENT EVENT No
prompt particles but W33 location Delayed Fe-poor
increase
SEPTEMBER 2000
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CONCLUSIONS

• THREE PHASES OF PARTICLE ACCELERATION
• ALL COMBINATIONS ARE POSSIBLE AND LEAD TO A
  ZOO OF SOLAR ENERGETIC PARTICLE EVENTS

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