ROSES ID: NNH19ZDA001N Selection Year: 2019
Program Element: Focused Science Topic
Principal Investigator: Lingling Zhao
Affiliation(s): University Of Alabama, Huntsville
Project Member(s):
le Roux, Jakobus A. Co-I University Of Alabama, Huntsville
Zank, Gary P Co-I University Of Alabama, Huntsville
Adhikari, Laxman Postdoctoral Associate University Of Alabama, Huntsville
Li, Gang Co-I University Of Alabama, Huntsville
Summary:
Objective: Gradual solar energetic particle (SEP) events are associated generally with interplanetary shocks driven by coronal mass ejections (CME), where energetic ions are thought to be accelerated via diffusive shock acceleration (DSA). Close to the Sun, strong shocks can occasionally accelerate particles to GeV energies. Most typical CME-driven shocks tend to accelerate charged particles to quite modest energies, and the total energy contained within the accelerated SEPs is typically a small fraction (< 10%) of the kinetic energy of the shock. However, a number of extreme CME-driven shock events have been observed with energetic particle pressures not only dominating the downstream thermal and magnetic field pressures but being a significant fraction of the ram energy of the shock wave itself. These extreme shocks are fast, very broad, and do not satisfy the standard Rankine-Hugoniot conditions. For these extreme events, not only the backreaction of the energetic particles on shock structure has to be properly considered, but the turbulence generated by the SEP component streaming in the solar wind plasma needs also be taken into account as they affect the scattering and transport properties of the SEPs. Therefore, to build a complete picture of extreme SEP events, one should consider shock structure, turbulence, and energetic particles as an integrated system. The science goal of this project is to (1) model the time-dependent, multi-D mediation of shock structure by the DSA of SEPs for extreme SEP events, and (2) describe quantitatively the 2D interplanetary transport of SEPs that escape a mediated shock, stream and generate turbulence that affects the transport of the SEPs themselves.Performance Year | Reference | Investigation Type | Actions |
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3 | L.-L. Zhao (PI), G. P. Zank (Co-I), M. Nakanotani, and L. Ad... G. P. Zank (Co-I), L. L. Zhao (PI), L. Adhikari (Co-I), A. P... B.-B. Wang, L.-L. Zhao (PI), P. Abouhamzeh, G. P. Zank (Co-I... L. Adhikari (Co-I), G. P. Zank (Co-I), D. Telloni, L.-L. Zha... L. Adhikari (Co-I), G. P. Zank (Co-I), B.-B. Wang, L.-L. Zha... B. Park, A. Pitňa, J. Šafránková, Z. Němeček, O. Krupa... M. Nakanotani, G. P. Zank (Co-I), and L.-L. Zhao (PI), Picku... M. Nakanotani, L.-L. Zhao (PI), and G. P. Zank (Co-I), Phase... Zheyi Ding, Gang Li (Co-I), Adolfo Santa Fe Dueñas, Robert ... le Roux, J. A. (Co-I), Parallel and Momentum Superdiffusion ... le Roux, J. A. (Co-I), Anomalous Transport of Energetic Part... Florinski, V., Guzman, J. G. A., Giacalone, J., le Roux, J. ... | Other Investigations Other Investigations Other Investigations Other Investigations Other Investigations Other Investigations Other Investigations Other Investigations Other Investigations Other Investigations Other Investigations Other Investigations |