Community of European Solar Radio Astronomers – Page 2

Observations of coronal holes with the Siberian Radio Heliograph by Altyntsev et al.

2024-11-05

Coronal holes (CHs) are regions of reduced brightness in solar disk images in extreme ultraviolet (EUV) or soft X-ray emissions corresponding to configurations with open magnetic field lines. Data on their area and depth of brightness depression is used in forecasts of solar wind parameters in the vicinity of Earth. Regular two-dimensional observations of CHs in microwaves with a spatial resolution to 10–20“ began in the 1990s at frequencies of […]

Generation of Series of Meter/Decimeter III type Bursts During Thermal Phase of Solar Flare by Meshalkina and Altyntsev

2024-10-22

It has been established that decimeter type III bursts are generated in the upper corona by electron beams. However, many questions remain about their sources to this day. Some were associated with the jets generated by regular solar flares, but most were found to be associated with weak energy release events. The purpose of this work is to determine the relationship of meter and decimeter III type bursts with the […]

Periods and frequency drifts of groups of narrowband decimetric spikes by M. Karlický, J. Dudík and J. Rybák

2024-10-02

The narrowband decimetric spikes belong to the most interesting solar radio bursts, because they are connected to the primary flare process. Their brightness temperature is up to 1015 K. In the radio spectrum, they occur in clouds of many narrowband bursts with a relative bandwidth of about 1-3 % and duration less than 100 ms (Benz, 1986). Many models of these spikes were proposed, such as those based on the […]

Time-Profile Study of Type III Solar Radio Bursts Using Parker Solar Probe by Tulsi Thapa and Yihua Yan

2024-09-10

Type III solar radio bursts are frequent and powerful radio emissions caused by electron beams travelling through the solar corona into the interplanetary medium, providing valuable information about solar magnetic fields and solar wind dynamics. These bursts are associated with solar flares and indicate indirectly an energetic electron moving along magnetic field lines. This study uses Parker Solar Probe data to examine the time-profile characteristics of type III bursts in the low-frequency domain […]

The angular and frequency dependence of solar radio burst rise and decay times using multi-spacecraft observations by Nicolina Chrysaphi et al.

2024-08-27

Density fluctuations populating the heliosphere interfere with propagating radio photons, altering their trajectories through frequency-dependent effects like scattering. Crucially, these density fluctuations are anisotropic, leading to anisotropic scattering and directional radio-wave propagation. This means that observers at different positions may obtain different estimations of radio properties. Such effects are particularly evident in solar radio bursts which are emitted through the plasma emission mechanism. It has been shown that detectors at […]

A Catalog of Metric Type II Radio Bursts Detected by RSTN During Solar Cycle 24 by Bendict Lawrance et al.

2024-08-20

Metric type II radio bursts are a type of solar radio emission characterized by a slowly drifting radio emission observed in dynamic spectra. They are generated by the interaction of a coronal shock wave with the ambient solar wind plasma. We present our recent study, where we have compiled a comprehensive catalog of metric type II radio bursts using data from the Radio Solar Telescope Network (RSTN). This study gives […]

GUI for the e – CALLISTO Data: Analysis of Type II and Type III Solar Radio Bursts by Yashan Hettiarachchi et al.

2024-07-23

Solar radio bursts (SRBs) are sudden peaks in the low-frequency radio emissions originating from the sun. These emissions can also help predict space weather events that could have adverse effects on satellite communications and the global energy grid. A thorough understanding of this phenomenon demands the collection and analysis of solar emission data over vast geographical and time scales. In this regard, the e-CALLISTO network plays a major role through […]

Energetics of compressive waves in the solar corona by Francesco Azzollini et al

2024-07-02

Inelastic scattering off moving or oscillating density fluctuations leads to broadening of radio signals propagating in the solar corona and solar wind. Using an anisotropic density fluctuation model from the kinetic scattering theory for solar radio bursts, we deduce the plasma velocities (perpendicular to the line of sight) required to explain observations of spacecraft signal frequency broadening. The kinetic energy associated with these inferred bulk velocities cascades to smaller and […]

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