Microwave Signature of Relativistic Positrons in Solar Flares

TL;DR

This paper presents a novel microwave imaging technique to detect relativistic positrons in solar flares by exploiting their opposite helicity radiation signature, enabling remote identification of antiparticles in astrophysical sources.

Contribution

The study introduces a new method using microwave polarimetry and imaging to detect relativistic positrons in solar flares, overcoming previous detection challenges.

Findings

Detected relativistic positrons in multiple solar flares.

Demonstrated the feasibility of remote antiparticle detection via microwave helicity signatures.

Provided insights into high-energy nuclear processes in solar activity.

Abstract

Relativistic antiparticles can be created in high-energy nuclear interactions; thus, detection of antiparticles in an astrophysical source can tell us something remarkable about the underlying high-energy processes and nuclear interactions. However, once created, the antiparticles remain a minor fraction of their conjugant normal particles, so the detection of the antiparticles represents a big science challenge. To address this challenge we employ imaging and polarimetry of microwave radiation produced as the positrons gyrate in the ambient magnetic field. The key property of the radiation used in this method is that the oppositely charged particles, electrons and positrons, produce radiation with opposite helicity, easily distinguishable by currently operating radio facilities. Analysis of available spatially resolved microwave data augmented by independent magnetic field measurements allows us to remotely detect the relativistic positron component in several solar flares.