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astro-ph.HE2026
Acoustic instability at shock-wave precursors
Antonio Capanema, Pasquale Blasi, Emanuele Sobacchi
Magnetic field amplification is an integral part of the process of particle acceleration at non-relativistic shocks. It is necessary to reach the maximum energies required by obser…
astro-ph.HE2025
Absorption of strong electromagnetic waves in magnetized pair plasmas
Emanuele Sobacchi
We discuss synchrotron absorption of a short electromagnetic pulse that propagates in a cold magnetized pair plasma. We show that the pulse can be absorbed when $ω_{\rm B}/a_0< ω<…
astro-ph.HE2025
The Role of Acoustic Instability in Cosmic-Ray Self-Confinement
Antonio Capanema, Pasquale Blasi, Emanuele Sobacchi
Over the past decades, there has been growing observational and theoretical evidence that cosmic-ray-induced instabilities play an important role in both acceleration and transport…