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)