Diagnose Physical Conditions Near the Flare Energy-release Sites from Observations of Solar Microwave Type III Bursts

TL;DR

This paper develops formulas to diagnose plasma density, temperature, magnetic field, and electron beam properties near solar flare energy-release sites using microwave type III burst observations, aiding understanding of flare physics.

Contribution

It introduces a new set of formulas that incorporate magnetic field effects to estimate physical conditions near flare energy-release sites from microwave burst data.

Findings

Estimated plasma density and magnetic field strength near reconnection sites.

Derived electron beam velocities and energies from burst observations.

Applied formulas to real flare data, yielding plausible physical parameters.

Abstract

In the physics of solar flares, it is crucial to diagnose the physical conditions near the flare energy-release sites. However, so far it is unclear how do diagnose these physical conditions. Solar microwave type III burst is believed to be a sensitive signature of the primary energy release and electron accelerations in solar flares. This work takes into account the effect of magnetic field on the plasma density and developed s set of formulas which can be used to estimate the plasma density, temperature, magnetic field near the magnetic reconnection site and particle acceleration region, and the velocity and energy of electron beams. We applied these formulas to three groups of microwave type III pairs in a X-class flare, and obtained some reasonable and interesting results. This method can be applied to other microwave type III bursts to diagnose the physical conditions of source regions, and provide some basic information to understand the intrinsic nature and fundamental processes occurring near the flare energy-release sites.