Irregular Proton Injection to High Energies at Interplanetary Shocks

Domenico Trotta, Timothy S. Horbury, David Lario, Rami Vainio, Nina Dresing, Andrew Dimmock, Joe Giacalone, Heli Hietala, Robert F. Wimmer-Schweingruber, Lars Berger, Liu Yang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


How thermal particles are accelerated to suprathermal energies is an unsolved issue, crucial for many astrophysical systems. We report novel observations of irregular, dispersive enhancements of the suprathermal particle population upstream of a high-Mach-number interplanetary shock. We interpret the observed behavior as irregular “injections” of suprathermal particles resulting from shock front irregularities. Our findings, directly compared to self-consistent simulation results, provide important insights for the study of remote astrophysical systems where shock structuring is often neglected.

Original languageEnglish (US)
Article numberL13
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Nov 1 2023

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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