fine spectral structures

radio spectrum

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

August 19, 2025

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 […]

Radio Probing of Solar Wind Sources in Coronal Magnetic Fields  by A. Koval et al.*

January 18, 2022

The magnetic fields of the Sun govern the solar corona structure where the solar wind emanates and further accelerates supersonically. Therefore, the accurate observational data about the topology, and more significantly, quantities of the coronal magnetic field are pivotal for identifying the solar wind sources as well as for the Space Weather modeling where these data specify initial conditions. Magnetic-field strength values in the solar wind sources are derived from […]

Radio echo in the turbulent corona and simulations of solar drift-pair radio bursts observed with LOFAR by Kuznetsov et al

August 18, 2020

Drift-pair bursts are a rare and mysterious type of fine spectral structures in the low-frequency domain of solar radio emission. First identified by Roberts (1958), they appear in the dynamic spectrum as two parallel frequency-drifting bright stripes separated in time; the trailing stripe seems to repeat the morphology of the leading one with a typical delay of ~1–2 s (see, e.g., Figure 1). Recent imaging spectroscopy observations with the LOw-Frequency […]

Detection of Spike-like structures near the front of Type II radio bursts by S. Armatas et al.*

July 2, 2019

Type II solar radio bursts are the result of energetic electrons accelerated by a shock. This kind of burst appears on dynamic spectra as lanes which drift slowly from high to lower frequencies. Often, we observe a fundamental – harmonic structure, which sometimes exhibits a division on each band called band-split.  Fine structures are emissions with short duration and bandwidth embedded within all types of radio bursts and constitute a […]

Scaling-laws of Radio Spike Bursts and Their Constraints on New Solar Radio Telescopes by Baolin Tan et al.

June 18, 2019

Radio observation is one of the most important methods in solar physics and space science. Sometimes, it is almost the sole approach to observing physical processes such as the acceleration, emission, and propagation of non-thermal energetic particles, etc. Long-term observation and study have revealed that a strong solar radio burst is always composed of many small bursts with different time-scales. Among them, a radio spike burst is the smallest one, […]