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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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CANE and RICHARDSON
INTERPLANETARY CORONAL MASS EJECTION
SUN
ICME
SHOCK
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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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Gopalswamy 2006
m-λ type II
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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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SHOCK ACCELERATION
THIRD PHASE
THREE PHASES OF PARTICLE ACCELERATION
FLARE IMPULSIVE PHASE (FIRST) FLARE LATE PHASE (SECOND)
CME
SHOCK
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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 phaseAvailable magnetic energy plus magnetic structure of photosphere and
corona
Very LowNo CME
LowJet
Low/mediumSmall CME
Medium/largeMedium/large CME
No SEP
Open Field Lines?
Yes
No V. Good magneti
c connect
-ion
No
Yes
3He-rich, Fe-rich, He-rich,Electron-rich SEP event
Type III burst
No SEP
Yes
Open Field Lines?
No
Yes
Shock?
Fe-rich, Electron-richSEP event
Type III (and Type II burst)
Connection?
Very good
OK
No
No SEP
Poor
Fe-rich, Electron-rich(possibly 3He-rich He-rich) SEP event
PLUS late Fe-coronal componentType III and Type II burst
Connection?
PoorGood
Yes = 2nd phase
No
Efficient late/extended phase
acceleration?
Open Field Lines?
Aug 14 2002
Yes
No
IMPULSIVE
May 1 2000
No SEP
Sep 17 2002
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Connection?
Fe-coronal orFe-poor event
Strong Shock?
Reasonably Fe-rich event
(Type III), type III-l, (II,IV)
Very poor
Fe-rich early component at low and high energies
Fe-coronal/Fe-poor component later(Type III), type III-l, (II,IV)
Good
Connection?
No
Yes
Yes
Sep 15 2001
GRADUAL
Low energy Fe-coronal late event
Possibly type I
ERUPTING LOOP PLUS RECONNECTION = 1st phaseAvailable magnetic energy plus magnetic structure of photosphere and
corona
Open Field Lines?
No SEP
No
Open Field Lines?
Yes = 3rd phase
Jan 8 2002
No
Yes
Passing ShockOr CIR?
No
Aug 9 2001
No
DSF events
Yes
3rd phase + maybe 2nd phase but no 1st phase
Oct 1 2001
Major events
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eras MAY 2000
ACE ULEIS / SIS ions
SOHO EPHIN electrons
0.3 - 0.7 MeV0.7 – 1 MeV3 - 6 MeV
SOHO ERNE protons & He
8 – 10 MeV p8 – 10 MeV He26 – 32 MeV p8 – 10 MeV He/p
0.3 – 0.6 MeV/n Fe0.3 – 0.6 MeV/n O10 – 13 MeV/n Fe10 – 13 MeV/n O0.3 – 0.6 MeV/nFe/O
FIRST PHASE ONLYPrompt particles Fe and e - rich
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SEPTEMBER 2000
THIRD PHASE ONLY
“DISAPPEARING FILAMENT EVENT”
No prompt particles but W33 location
Delayed Fe-poor increase
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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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