Download presentation
Presentation is loading. Please wait.
1
Marty Lee Durham, New Hampshire USA
An Analytical Theory of Diffusive Shock Acceleration for Gradual SEP Events Marty Lee Durham, New Hampshire USA
2
Acceleration at a CME-Driven Shock
Lee, 2005
3
First-Order Fermi Acceleration
v vz
4
Upstream Waves I Tsurutani et al., 1983
5
Upstream Waves II Hoppe et al., 1981
6
Instability Mechanism
v VA vz
7
January 20, 2005 GLE Event Bieber et al., 2005
8
Large SEP Events Reames and Ng, 1998
9
SEP Energy Spectra Tylka et al., 2001
10
Shock Geometry Cane et al., 1988
11
Shock Acceleration I
12
Shock Acceleration II
13
Shock Acceleration III
14
Shock Acceleration IV
15
Shock Acceleration V
16
Analytical and Numerical Calculations Proposed I
1. Calculation of with dependence on 2. Role of shock obliquity (Tylka and Lee, 2006)
17
Analytical and Numerical Calculations Proposed II
3. Form of exponential rollover with dependence on 4. Ion spatial profiles upstream of the shock 5. Escaping ions and the streaming limit 6. Inferring from ESP events
18
Spectral Rollover: Mewaldt et al.;
19
Work Plan: Way Behind! Year 1: Complete and publish analytical work
Year 2: Develop the numerical algorithm and test the analytical approximation. Year 3: Systematic comparison of results with selected events
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.