Community of European Solar Radio Astronomers

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

2025-11-11

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 […]

Noise in Maps of the Sun at Radio Wavelengths by T. S. Bastian et al.

2025-10-28

The Sun is a powerful source of radio emissions, so much so that – unlike most celestial sources – this emission dominates the system noise of many radio telescopes. The noise resulting from such sources is referred to as “self-noise”. Two recent papers discuss self-noise in maps of the Sun at radio frequencies formed using the techniques of Fourier synthesis imaging. Examples of radio telescopes that exploit this technique include […]

Connecting EUV Observations of Chromospheric Large-Scale Flows and their properties at particular heights using Nobeyama 17 GHz data: I. The differential rotation profile by S. Routh et al.

2025-10-14

The phenomenon of differential rotation in the Sun, described by Eq.1 where A is the equatorial rotation rate, A and C are latitudinal gradients and $\theta$ is latitude, is a cornerstone of solar dynamo theory. While helioseismology and feature tracking in optical and EUV wavelengths have helped map this profile at the surface and in the deep interior, ambiguity remains in the higher layers of the solar atmosphere, largely due […]

On the limitations of using metric radio bursts as diagnostic tools for interplanetary coronal mass ejections by J. Kandekar et al.

2025-09-30

Our Sun is constantly active, and much of its activity, like Solar Flares and Coronal Mass Ejections, is driven by its Magnetic Fields. However, one cannot directly estimate this magnetic field; one needs to employ various observational and radio techniques to estimate these magnetic fields (White 2004; Gopalswamy 2006). While radio-based techniques have been used to explore coronal magnetic fields in localised regions (e.g., using band-splitting in type II bursts; […]

A Flare-related Decimetric Type-IV Radio Burst Induced by the X2 Radiation of Electron Cyclotron Maser Emission by Lv et al.

2025-09-16

Decimetric broadband radio bursts (with frequencies of hundreds of MHz to a few GHz) have been observed from the Sun and other flaring stars. In the solar case, such bursts have been classified as the decimetric type-IV (t-IVdm) bursts. Their spectra often contain substantial fine structures, such as pulsations, spikes, and various absorption structures. This makes them distinct from their metric and centimetric counterparts. Due to the lack of imaging […]

Observation and Modeling of Small Spatial Structures of Solar Radio Noise Storms using the uGMRT by S. Mondal et al.

2025-09-02

One of the most commonly observed solar radio sources in the metric and decametric wavelengths are the so-called solar noise storms. These are generally associated with active regions and are believed to be powered by the plasma emission mechanism. Since plasma emission emits primarily at the fundamental and the harmonic of the local plasma frequency, the apparent angular size of the source can become significantly scatter-broadened due to the multi-path […]

A novel fine spectral structure of solar radio bursts with periodic beaded stripes observed by CBSm of CMP-II by Li et al.

2025-08-19

Substantial fine structures, such as zebras, drifting bursts, spikes, and fibers have been reported during the past decades of observations of solar radio bursts. These fine structures are frequently associated with the wide-band continuum such as type-IV bursts, at both metric and decametric wavelengths. They carry important information about the radiation process and coronal conditions. Previous studies have reported the so-called narrow-band stripes (e.g., Chernov 2008), characterized by a group […]

Polarization Analysis of Type III Langmuir/Z-mode Waves with Coherent Magnetic Component Observations by Solar Orbiter by T. Formánek et al.

2025-08-05

Type III solar radio bursts are generated by beams of energetic electrons propagating through interplanetary space. These electron beams, released from the Sun, travel along the Parker spiral and grow Langmuir waves through a kinetic instability in the electron velocity distribution function. The generated Langmuir waves subsequently undergo mode conversion, producing a radio emission at the plasma frequency or its harmonic. Langmuir waves are electrostatic waves generating the electric field […]

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