Parker Solar Probe (PSP)

A 19-day solar radio burst: a corotating radio reservoir in the outer corona by Vratislav Krupar et al.

June 16, 2026

Solar radio astronomers are used to type IV bursts as the long afterglow of eruptive activity: broadband continua, often polarized, produced by energetic electrons trapped in post-eruption magnetic structures. But “long” usually means minutes to hours, sometimes longer in exceptional cases. The event reported by Krupar et al. 2026 changes that scale. A hectometric type IV continuum between about 0.5 and 3 MHz was observed over nearly 19 days, from […]

type III burst magnetic field

Signatures of Large-scale Magnetic Field Disturbances and Switchbacks in Interplanetary Type III Radio Bursts by Daniel L. Clarkson et al.

April 30, 2026

Solar radio bursts are intrinsically linked to the motion of their emitting source through the coronal and heliospheric plasma. Electron transport is mostly confined to magnetic field lines. These electrons move at a substantial fraction of the speed of light and often generate radio emission via the plasma emission process. The resulting radio bursts, such as type III bursts from electrons streaming along open field lines, are an excellent diagnostic […]

Multispacecraft Analysis and Modeling of Type III Radio Burst Exciter Deceleration in Inhomogeneous Heliospheric Plasma F. Azzolini et al.

November 11, 2025

Electron beams accelerated in solar flares and escaping from the Sun along open magnetic field lines can trigger intense radio emissions known as type III solar radio bursts. However, the propagation dynamics of these electrons is still poorly understood and observationally constrained (Dulk et al 1987, Krupar et al 2015). Historically, single-spacecraft measurements have suggested deceleration but suffered from large uncertainties due to unknown source position. By leveraging four spacecraft […]

Multi-spacecraft Radio Observations Trace the Heliospheric Magnetic Field by D. L. Clarkson et al.

April 25, 2025

Solar flares accelerate energetic electrons that escape into interplanetary space, guided by the Parker spiral magnetic field, and are responsible for the generation of the interplanetary Type III solar radio bursts. With multiple spacecraft now in orbit around the Sun (see e.g. Musset et al 2021), we are in a unique position of observing the propagation of radio emission through the heliosphere from multiple vantage points. Recent study by Clarkson […]

Spectral Characteristics of Fundamental–Harmonic Pairs of Interplanetary Type III Radio Bursts Observed by PSP, by Ling Chen et al.

April 1, 2025

Type III radio bursts are the most powerful and common type of solar radio bursts, shifting rapidly from high to low frequencies. In addition to the fast frequency drift from high to low frequencies, the fundamental–harmonic (F-H) frequency pairs’ structure in their dynamic spectra is the other most important observed feature of solar type III radio bursts. In this Letter, using the radio data observed by PSP during encounter phases […]