Community of European Solar Radio Astronomers

First Robust Detection of Linear Polarization from Metric Solar Emissions: Challenging Established Paradigms by S. Dey et al.

2025-12-09

Polarization measurements of solar radio emissions are key diagnostics of coronal plasma, magnetic fields, and propagation effects, and can provide additional constraints on the emission mechanisms. At meter wavelengths, circular polarization (CP) has long been exploited in solar radio studies, while linear polarization (LP) has been assumed to be absent. This view arose from the expectations that strong coronal Faraday rotation would completely depolarize LP within typical observational bandwidths and […]

New Instrument in Solar Flare Detection: A 50–55 GHz Millimeter-Wave Radiometer Spectrometer by X. Xu et al.

2025-11-25

Solar flares, among the most intense explosive phenomena in the solar atmosphere, release vast amounts of energy in a short period, resulting in enhanced electromagnetic radiation across multiple bands. These events pose significant threats to Earth’s space environment and human activities in space. High-energy electrons accelerated during flares emit millimeter-wave radiation through gyrosynchrotron radiation, providing unique insights into the underlying magnetic fields and energy release processes (Fleishman et al 2018). […]

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 […]

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