theory of shock acceleration of hot ion populations n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Theory of Shock Acceleration of Hot Ion Populations PowerPoint Presentation
Download Presentation
Theory of Shock Acceleration of Hot Ion Populations

Loading in 2 Seconds...

play fullscreen
1 / 42

Theory of Shock Acceleration of Hot Ion Populations - PowerPoint PPT Presentation


  • 111 Views
  • Uploaded on

Theory of Shock Acceleration of Hot Ion Populations. Marty Lee Durham, New Hampshire USA. Current Issues & Challenges. Theory of Planar Stationary Diffusive Shock Acceleration Injection Rates and Injection Thresholds “Hot” and “Cold” Seed Particle Populations Quasilinear Wave Excitation

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Theory of Shock Acceleration of Hot Ion Populations' - milek


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
current issues challenges
Current Issues & Challenges
  • Theory of Planar Stationary Diffusive Shock Acceleration
  • Injection Rates and Injection Thresholds
  • “Hot” and “Cold” Seed Particle Populations
  • Quasilinear Wave Excitation
  • Ion Fractionation Upstream of the Shock
  • Power-law Index: Observations Versus Theory
  • Varying Magnetic Obliquity Within an Event
  • Geometry: Earth’s Bow Shock & Solar Wind Termination Shock
  • Nonlinear Waves & SLAMS
current issues challenges1
Current Issues & Challenges
  • Theory of Planar Stationary Diffusive Shock Acceleration
  • Injection Rates and Injection Thresholds
  • “Hot” and “Cold” Seed Particle Populations
  • Quasilinear Wave Excitation
  • Ion Fractionation Upstream of the Shock
  • Power-law Index: Observations Versus Theory
  • Varying Magnetic Obliquity Within an Event
  • Geometry: Earth’s Bow Shock & Solar Wind Termination Shock
  • Nonlinear Waves & SLAMS
anisotropy limitation

Anisotropy Limitation

Giacalone and Jokipii, 1999

ion features

Ion Features

Van Nes et al., 1984

ace shock survey

ACE Shock Survey

Lario et al., 2005

current issues challenges2
Current Issues & Challenges
  • Theory of Planar Stationary Diffusive Shock Acceleration
  • Injection Rates and Injection Thresholds
  • “Hot” and “Cold” Seed Particle Populations
  • Quasilinear Wave Excitation
  • Ion Fractionation Upstream of the Shock
  • Power-law Index: Observations Versus Theory
  • Varying Magnetic Obliquity Within an Event
  • Geometry: Earth’s Bow Shock & Solar Wind Termination Shock
  • Nonlinear Waves & SLAMS
example event 1999 47 49 cold seeds
Example Event:1999 / 47-49(Cold Seeds)

Density compression: d/u ~ 2.9

Clear proton foreshock of appropriate scale.

Softening particle spectra on the same ESP scale.

Particle intensity index appropriate to shock strength.

Small proton anisotropy.

Wave foreshock appropriate scale.

Argued and confirmed to be cold ion seed population leading to shock acceleration.

example event 1998 217 219 hot seeds
Example Event:1998 / 217-219(Hot Seeds)

Density compression: d/u ~ 1.8

Very modest or questionable proton foreshock if SEP event is properly recognized.

Softening particle spectra on SEP scale.

Moderate proton anisotropy.

Nonexistent wave foreshock.

Argued and confirmed to be hot ion seed population leading to shock acceleration.

current issues challenges3
Current Issues & Challenges
  • Theory of Planar Stationary Diffusive Shock Acceleration
  • Injection Rates and Injection Thresholds
  • “Hot” and “Cold” Seed Particle Populations
  • Quasilinear Wave Excitation
  • Ion Fractionation Upstream of the Shock
  • Power-law Index: Observations Versus Theory
  • Varying Magnetic Obliquity Within an Event
  • Geometry: Earth’s Bow Shock & Solar Wind Termination Shock
  • Nonlinear Waves & SLAMS
wave excitation iii

Wave Excitation - III

 = 7; I0(k)  0

current issues challenges4
Current Issues & Challenges
  • Theory of Planar Stationary Diffusive Shock Acceleration
  • Injection Rates and Injection Thresholds
  • “Hot” and “Cold” Seed Particle Populations
  • Quasilinear Wave Excitation
  • Ion Fractionation Upstream of the Shock
  • Power-law Index: Observations Versus Theory
  • Varying Magnetic Obliquity Within an Event
  • Geometry: Earth’s Bow Shock & Solar Wind Termination Shock
  • Nonlinear Waves & SLAMS
ion fractionation

Ion Fractionation

Tylka et al., 1999

current issues challenges5
Current Issues & Challenges
  • Theory of Planar Stationary Diffusive Shock Acceleration
  • Injection Rates and Injection Thresholds
  • “Hot” and “Cold” Seed Particle Populations
  • Quasilinear Wave Excitation
  • Ion Fractionation Upstream of the Shock
  • Power-law Index: Observations Versus Theory
  • Varying Magnetic Obliquity Within an Event
  • Geometry: Earth’s Bow Shock & Solar Wind Termination Shock
  • Nonlinear Waves & SLAMS
complications within dsa
Complications within DSA

Wave-frame compression ratio:

Van Nes et al., 1984

current issues challenges6
Current Issues & Challenges
  • Theory of Planar Stationary Diffusive Shock Acceleration
  • Injection Rates and Injection Thresholds
  • “Hot” and “Cold” Seed Particle Populations
  • Quasilinear Wave Excitation
  • Ion Fractionation Upstream of the Shock
  • Power-law Index: Observations Versus Theory
  • Varying Magnetic Obliquity Within an Event
  • Geometry: Earth’s Bow Shock & Solar Wind Termination Shock
  • Nonlinear Waves & SLAMS
fe o versus energy
Fe/O Versus Energy

Tylka et al., 2005

fe o versus energy1
Fe/O Versus Energy

Tylka and Lee, 2006

current issues challenges7
Current Issues & Challenges
  • Theory of Planar Stationary Diffusive Shock Acceleration
  • Injection Rates and Injection Thresholds
  • “Hot” and “Cold” Seed Particle Populations
  • Quasilinear Wave Excitation
  • Ion Fractionation Upstream of the Shock
  • Power-law Index: Observations Versus Theory
  • Varying Magnetic Obliquity Within an Event
  • Geometry: Earth’s Bow Shock & Solar Wind Termination Shock
  • Nonlinear Waves & SLAMS
the blunt termination shock
The Blunt Termination Shock

McComas and Schwadron, 2006

current issues challenges8
Current Issues & Challenges
  • Theory of Planar Stationary Diffusive Shock Acceleration
  • Injection Rates and Injection Thresholds
  • “Hot” and “Cold” Seed Particle Populations
  • Quasilinear Wave Excitation
  • Ion Fractionation Upstream of the Shock
  • Power-law Index: Observations Versus Theory
  • Varying Magnetic Obliquity Within an Event
  • Geometry: Earth’s Bow Shock & Solar Wind Termination Shock
  • Nonlinear Waves & SLAMS
upstream waves
Upstream Waves

Hoppe et al., 1981

slide42

SLAMS

Lucek et al., 2008