Nobeyama Radioheliograph (NoRH)

First Observational Evidence for Meridional Flow-like Profile in 17 GHz: Magnetic Trees on the Sun? by Srinjana Routh et al.

June 17, 2026

Decrypting the behaviour of large-scale flows in the Sun, namely the differential rotation and the meridional circulation, is detrimental to the understanding of the evolution of the solar magnetic field in the global context. Among them, the meridional flow has been notoriously difficult to measure, owing to the fact that it is an order of magnitude lower than the differential rotation measurements, with its existence in the higher solar atmosphere […]

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 […]

Solar Microwave Polarization Observed by the Newest and Oldest Solar Radio Telescopes by Masumi Shimojo

May 1, 2024

Polarization, regardless of wavelength, is one of the key observables for understanding the solar atmosphere because it provides information about magnetic fields, and microwave polarization is also one of them. It can reveal magnetism in the chromosphere, transition region, and corona from the microwave polarization dependencies of opacity and emissivity related to magnetic fields. Although observing solar polarization in the microwave range is not easy, it has a long history […]

Localized Microwave and EUV Bright Structures in an Eruptive Prominence by J. Huang et al.*

July 30, 2019

We study a solar eruptive prominence with flare/coronal mass ejection (CME) event by microwave and extreme ultraviolet (EUV) observations. Its evolution can be divided into three phases: slow rise, fast expansion, and ejection. In the slow-rise phase, the prominence continuously twists for more than one hour with a patch of bright emission appearing around the top. When the north leg interacts with the local small-size loops, the fast expansion is […]

Association of radio polar cap brightening with bright patches and coronal holes by C. L. Selhorst et al.*

March 20, 2018

The purpose of this work is to model the emission of 17 GHz polar bright patches, which are frequently observed by the Nobeyama Radioheliograph (NoRH) in association with coronal holes. Although these bright regions have been observed for a few decades, their nature remains unclear. Our simulations were based on the temperature and density profiles from the SSC atmospheric model (Selhorst et al., 2005), with modifications to include a coronal […]