particle acceleration

LOFAR imaging spectroscopy reveals spike-like repeating radio burst pairs in the solar corona by Suli Ma et al.

June 17, 2026

The solar atmosphere is a turbulent and magnetized environment, with the release of magnetic energy readily manifesting as emission across the electromagnetic spectrum. Solar radio emission dominates the radio sky, with the brightest solar radio bursts generated via the plasma emission process. The emission has a complex frequency-time structure with many features that are yet to be understood. Observations Using the LOw Frequency ARray (LOFAR) radio telescope (van Haarlem et […]

Quasi-Periodic Particle Acceleration in a Solar Flare by B. Clarke et al.*

August 17, 2021

Quasi-periodic pulsations (QPPs) are defined as intensity modulations in the flare electromagnetic radiation as a function of time. These modulations have been found to have characteristic periodicities that range from < 1 s up to several minutes. QPPs were first associated with the impulsive phase of flares and observed in the hard X-ray (HXR) and radio wavebands (Parks & Winkler 1969). They have more recently been observed within the thermal […]

Short-period Waves in Flare Loops: Possible Vehicle for Flare Energy Transport by Sijie Yu et al

March 26, 2019

Solar flares involve the sudden release of magnetic energy in the solar corona. Accelerated nonthermal electrons have been often invoked as the primary means for transporting the bulk of the released energy to the lower solar atmosphere. However, significant challenges remain for this scenario, especially in accounting for the large number of accelerated electrons inferred from observations. Propagating magnetohydrodynamics (MHD) waves, particularly those with subsecond/second-scale periods, have been proposed as […]

Synergy of stochastic and systematic energization of plasmas during turbulent reconnection by Th. Pisokas, L. Vlahos and H. Isliker

February 6, 2018

In the current literature the acceleration of particles during solar flares is attributed to either weak turbulence or to large scale Unstable Current Sheet (UCS). The way UCS drive weak turbulence in a separated volume on the loop top or inside the loops below the UCS was never been presented in detail. During the last thirty years the plasma physics community developed the concept of turbulent reconnection. This concept went unnoticed […]

Acceleration and Storage of Energetic Electrons in Magnetic Loops in the Course of Electric Current Oscillations by V.V. Zaitsev and A.V. Stepanov

October 31, 2017

There are long-lived radio events on the Sun and stars like in type IV solar radio bursts with sudden reductions and pulsating type III bursts (Slottje, 1972; Huang et al. 2016) as well as intriguing intense radio emission from ultracool stars that lasts for several rotation periods (Hallinan et al. 2007). This can be the result of the multiple injections of accelerated electrons into the coronal magnetic loops. The idea […]