Speaker
Dr
Yulia Kartavykh
(Julius-Maximilians Universität Würzburg, Würzburg, Germany)
Description
We use numerical solutions of the focused transport equation to study the
evolution of the pitch-angle dependent distribution function of protons
in the vicinity of parallel and oblique shock waves and compare the results
with predictions of diffusive shock acceleration theory. We then consider the
case that a seed population of protons is injected close to the Sun
simultaneously with a travelling interplanetary shock, and investigate the
effects of pitch-angle dependent spatial diffusion, first-order Fermi acceleration
at the shock and adiabatic energy losses in the expanding solar wind behind the
shock. We analyze the resulting energy spectra, angular distributions and
intensity-time profiles at various distances from the Sun and discuss the question
whether the typically observed spectra can be explained from acceleration out of
a thermal seed population, or whether a hard injection spectrum would be necessary.
Finally, we apply our simulations to model a number of interplanetary particle
events involving shock waves which were observed on the Helios, ACE and Wind
spacecraft.
| Registration number following "ICRC2015-I/" | 0897 |
|---|---|
| Collaboration | -- not specified -- |
Primary author
Dr
Yulia Kartavykh
(Julius-Maximilians Universität Würzburg, Würzburg, Germany)
Co-authors
Prof.
Michael Gedalin
(Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva, Israel)
Prof.
Wolfgang Dröge
(Julius-Maximilians Universität Würzburg, Würzburg, Germany)
