Incoherent Solar Radio Emission
A. Nindos

TL;DR
This paper reviews incoherent solar radio emission mechanisms—free-free, gyroresonance, and gyrosynchrotron—and discusses their diagnostic applications for probing the solar atmosphere and magnetic fields.
Contribution
It provides a detailed analysis of the emission mechanisms and highlights their potential for solar atmospheric diagnostics, especially in non-flaring and flaring conditions.
Findings
Free-free emission dominates in the non-flaring Sun.
Gyroresonance emission reveals magnetic field strength and orientation.
Gyrosynchrotron emission is key during solar flares at >1-2 GHz.
Abstract
Incoherent solar radio radiation comes from the free-free, gyroresonance, and gyrosynchrotron emission mechanisms. Free-free is primarily produced from Coulomb collisions between thermal electrons and ions. Gyroresonance and gyrosynchrotron result from the acceleration of low-energy electrons and mildly relativistic electrons, respectively, in the presence of a magnetic field. In the non-flaring Sun, free-free is the dominant emission mechanism with the exception of regions of strong magnetic fields which emit gyroresonance at microwaves. Due to its ubiquitous presence, free-free emission can be used to probe the non-flaring solar atmosphere above temperature minimum. Gyroresonance opacity depends strongly on the magnetic field strength and orientation; hence it provides a unique tool for the estimation of coronal magnetic fields. Gyrosynchrotron is the primary emission mechanism in…
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Taxonomy
TopicsSolar and Space Plasma Dynamics · Ionosphere and magnetosphere dynamics · Astro and Planetary Science
