October, 2025 - CESRA: Community of European Solar Radio Astronomers

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

October 28, 2025

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.

October 14, 2025

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 […]