Powerful Solar Flares of September 2017: Correspondence Between Parameters of Microwave Bursts and Proton Fluxes near Earth

TL;DR

This paper examines the radio characteristics of three solar proton flares in September 2017, demonstrating that microwave burst parameters correlate with proton fluxes near Earth, revealing insights into particle acceleration processes.

Contribution

It establishes a correspondence between microwave burst parameters and energetic proton fluxes, highlighting the diagnostic potential of radio observations for solar energetic particle events.

Findings

Microwave flux density correlates with proton fluxes near Earth.

Frequency spectrum of microwave bursts reflects particle energy distribution.

Radio characteristics can predict SEP intensities.

Abstract

In this note, we consider radio characteristics of three proton flares that caused discrete enhancements of solar energetic particles (SEPs) near Earth. The analysis confirmed that the flux density and frequency spectrum of microwave bursts, although the latter are generated by electrons propagating to the photosphere, reflect the number and energy spectrum of accelerated particles, including the 10-100 MeV protons coming to Earth.