matt hill gang li shine 2007 session summary for shock geometry & upstream and downstream...
TRANSCRIPT
Matt Hill
Gang Li
SHINE 2007
Session summary for
Shock geometry & upstream and downstream phenomena
1-day session:
Tuesday morning
Tuesday afternoon
M. Lee: SEP Events, ESP Events and Shock Acceleration: Theory and Observations
C. W. Smith: Upstream (downstream) wave phenomena at a CME-driven shock
C. Cohen: Energetic particle spectra at interplanetary shocks
R.Kalenbach: Upstream wave spectrum and its temporal evolution in gradual SEP events
J. Giacalone: Reconciling Observed Spectra in SEP events with Diffusive Shock Acceleration: The Role of Large-Scale Turbulence
Errol Summerlin:The Acceleration of Solar Wind and Pick-up Ions at Interplanetary Shocks
G. Gloeckler:
Ubiquitous v-5 spectra throughout Heliosphere
• compressive turbulence
• divide population to (thermal) core and tail.
• the tail population will see an ensemble of rarefactions and compressions.
• the core ties to one density bump locally.
Cohen et al 2005
Heavy ion spectra shows a “shifting symmetry”
Ng, Reames, and Tylka (2003)
Break energy is ordered by (Q/A) with tightly related to upstream wave spectrum.
• Temporal (spatial) superposition
• Ion escape by magnetic mirroring
• Presence of ambient energetic particles
• Sensitive role of proton-excited waves
• Exponential energy rollover
• Compression ratios; downstream evolution?
I(k)?
k00
k0 (z)
5/3
6
2
Two days before the SHINE meeting, Chuck Smith sent an email to Mihir Desai with the following content: “ Eureka, Eureka! I finally found out. ”
Question: What did Chuck really found out?
different events seen by same s/c are different,
same event seen by different s/c are same.
particles accelerated at a shock will sample a variety of density jumps, not just a of local one => the compression ratio should be an average quantity.
Upstream power spectrum for the Jan. 20th 2005 event
Stochastic acceleration downstream CME shocks
Monte-Carlo simulation with FLM
His passport expires
Session focus: Identify and understand shock acceleration in large SEP events
key question: is 1st order Fermi acceleration the major player for particle acceleration in large SEP events?
Topics:
• upstream and downstream wave observations (or their absence) is large SEP events.
• morphology of particle spectra in large SEP events and its Q/A dependence.
• recent theoretical progresses in theoretical and modeling efforts of particle acceleration at interplanetary shocks.
• how shock acceleration depends on shock geometry
Title: MHD Simulations of Helmet Streamer EruptionsAuthor(s): Joel Allred (Drexel University), Peter MacNeice (Drexel University), Spiro Antiochos (Naval Research Lab)
Title: The Evolution of Heavy Ion Spectra at Interplanetary Shock PassagesAuthor(s): C.M.S.Cohen and R.A. Mewaldt (Caltech), G.M. Mason and G.C. Ho (JHU/APL), J.C. Kasper and J.D. Richardson (MIT), M.A. Lee (UNH)
Title: Event-based CME-driven shock simulations: SEP abundances and low-beta shocksAuthor(s): D. Krauss-Varban, Y. Li, and J. G. Luhmann; Space Sciences Laboratory, University of California, Berkeley
Title: MHD Simulation Outputs for SEP Event Modeling- an example from CISMAuthor(s): J.G. Luhmann, S. Ledvina, D. Krauss-Varban (SSL, UC Berkeley), D. Odstrcil (CIRES, U. of Colorado and NOAA/SEC), P. Riley (SAIC)
Title: First Results for He+ and He2+ From STEREO PLASTICAuthor(s): H. Kucharek(1), M. Popecki(1), A. Galvin(1), B. Klecker(2), E. Moebius(1), C.F. Farrugia(1), L.M. Kistler(1), P. Bochsler(3), R. Karrer(3), A. Opitz(3), and K. Simunac(1).
Title: Acceleration of Helium at Interplanetary ShocksAuthor(s): H. Kucharek (1), E. Moebius (1), F. Allegrini (2), M. I. Desai (2), B. Klecker (3), M.A. Popecki (1), A. B. Galvin (1), and P. Bochsler(4);
Title: Multipoint Studies of Interplanetary Shocks with STEREOAuthor(s): C T Russell(1), L Jian(1), J G Luhmann(2),A Szabo(3), M Acuna(3),X Blanco-Cano(4); (1) UCLA;(2)UCB;(3)GSFC;(4)UNAM
Title: Influence of large-scale interplanetary structures on energetic particle propagation: The September 2004 event at Ulysses and ACEAuthor(s): D. Lario (JHU/APL), R.B. Decker (JHU/APL)
Probing particle acceleration using heavy ion spectra
C. Cohen
• role of waves
• role of geometry
• seed population and injection
• compositional characteristics
• acceleration at a perp. shock, time scales
Theory and Modeling: (M. Lee and J. Giacalone)