Transcript He3 and/or electron rich events

SHINE 2007
He3 and/or electron rich events
Question:
What is the underlying acceleration mechanism in impulsive
SEP events now that observations show electron He3 and
Ultra heavy ions are greatly enhanced in these events?
Answer:
We still do not know, but a full-day session next year may help.
G. Mason:
Recent Progress in Understanding 3He-rich SEP Events
V. Petrosian:
Electron and ion acceleration in solar flares by turbulence
I. Roth:
Energization of Coronal Rare Elements - direct association to impulsive
electrons?
L.H. Wang:
Timing studies of electrons and its implication on He3 and electron rich
event
H. Cane
THE SOLAR ENERGETIC PARTICLE EVENT ZOO
From observations:
1. Enhancement of He3/He4 ~10^4.
2. different spectrum of He3
3. Heavy ions and UH enhancement.
4. Source of acceleration
5. Timing constraint.
no single model addresses electrons,
3He, heavy nuclei & UH nuclei
Vahe Petrosian
I. Roth
Stochastic acceleration
Oblique EM Cyclotron wave
Electron
flux
B
k
B
Oblique
Emic
waves
3He, Fe, X,
Kr
Both can explain selective acceleration of 3He, work for ions to some extends.
stochastic acceleration accelerate electrons simultaneous with ions.
Oblique EMIC waves are stimulated by electron beams shooting down.
Propagation and timing study
Impulsive SEP events
Type III burst
high-energy electrons
Acceleration
low-energy electrons
low-energy ions (3He-rich)
t
Dialogue from participants:
Ilan: more data is needed to better understand these impulsive SEP events.
Allan: No. It is not data what we need, but theory!
New classification of SEP events: (H. Cane)
SEP events are complex. The major determining factors are the amount of
magnetic energy, the topology of the magnetic field surrounding the
flare/CME, and the magnetic connection of the observer.