hard X-ray – Community of European Solar Radio Astronomers

Connecting energetic electrons at the Sun and in the heliosphere through X-ray and radio diagnostics by D. Paipa-Leon et al.

2025-06-10

Solar flares accelerate energetic electrons. While some of them escape into interplanetary space and produce interplanetary Type III solar radio bursts, the electrons interacting with the solar atmosphere produce Hard X-ray emission (HXR). Many studies relating the observations of type III radio bursts and HXR emissions have been performed since the first observations of their temporal association (e.g., Kane 1972, 1981). More recently, statistical studies were done by https://www.aanda.org/articles/aa/full_html/2025/02/aa52278-24/aa52278-24.html and James & Vilmer (2023) […]

X-ray/Radio Quasi-periodic Pulsations Associated with Plasmoids in Solar Flare Current Sheets by Kumar, Karpen, and Dahlin

2025-04-15

Plasmoids (or magnetic islands) are believed to play an important role in the onset of fast magnetic reconnection and particle acceleration during solar flares and eruptions. Direct imaging of flare current sheets and formation/ejection of multiple plasmoids in extreme ultraviolet (EUV) images, along with simultaneous X-ray and radio observations, provides significant insights into the mechanisms driving particle acceleration in solar flares. Previous studies have proposed that decimetric radio bursts and […]

Generation of Series of Meter/Decimeter III type Bursts During Thermal Phase of Solar Flare by Meshalkina and Altyntsev

2024-10-22

It has been established that decimeter type III bursts are generated in the upper corona by electron beams. However, many questions remain about their sources to this day. Some were associated with the jets generated by regular solar flares, but most were found to be associated with weak energy release events. The purpose of this work is to determine the relationship of meter and decimeter III type bursts with the […]

Simultaneous Submillimeter and Hard X-Ray Intermittent Processes during Flares
by Guillermo Giménez de Castro et al.*

2016-11-29

Intermittency is a disruptive characteristic of a process, which can be associated, in many cases, with a sudden energy release. Intermittency is a key characteristic of flares that should become evident in the flux time evolution at many different wavelengths. We investigate the similarities and differences of the intermittency during a solar flare in bremsstrahlung hard X-rays and synchrotron+free-free submillimeter emission. For this we chose a particular event that presents […]

Observation of a Quasi-periodic Pulsation in Hard X-Ray, Radio, and Extreme-ultraviolet Wavelengths
by Pankaj Kumar, Valery M. Nakariakov and Kyung-Suk Cho

2016-08-02

Quasi-periodic pulsations (QPPs) with periods from a few seconds to several minutes are often observed during solar/stellar flares in X-ray, radio, and optical wavelength bands. The study of QPPs is useful to understand the physical mechanism for the energy release, plasma heating, and particle acceleration during solar flares…