A solar radio dynamic spectrograph with flexible temporal-spectral resolution

Abstract

The observation and research of the solar radio emission have unique scientific values in solar and space physics and related space weather forecasting applications, since the observed spectral structures may carry important information about energetic electrons and underlying physical mechanisms. In this study, we present the design of a novel dynamic spectrograph that is installed at the Chashan solar radio station operated by Laboratory for Radio Technologies, Institute of Space Sciences at Shandong University. The spectrograph is characterized by the real-time storage of digitized radio intensity data in the time domain and its capability to perform off-line spectral analysis of the radio spectra. The analog signals received via antennas and amplified with a low-noise amplifier are converted into digital data at a speed reaching up to 32 k data points per millisecond. The digital data are then saved into a high-speed electronic disk for further off-line spectral analysis. Using different word length(1 k -32 k) and time cadence (5 ms -10 s) for the off-line fast Fourier transform analysis, we can obtain the dynamic spectrum of a radio burst with different (user-defined) temporal (5 ms -10 s) and spectral (3 kHz ∼ 320 kHz) resolution. This brings a great flexibility and convenience to data analysis of solar radio bursts, especially when some specific fine spectral structures are under study.

Harmonics of Solar Radio Spikes at Metric Wavelengths

“…The resolutions of the obtained radio dynamic spectral data are 10 ms in time and 160 kHz in frequency, and the dynamic range is ≈ 50 dB. Du et al (2017) gives the technical details of the data acquisition and recording. In order to make sure the observational data are reliable, we also use the data of the ORFEES (http://radio-monitoring.obspm.fr/downloadOrfeesHR1.php) and the Radio Solar Telescope Network (RSTN)/Learmoth (http://www.sws.Bom.…”

A deep learning method for the recognition of solar radio burst spectrum

“…Solar radio bursts originate from energetic electrons, which are radio wave signals. The frequency ranges from KHz to sub THz, and the intensity can increase to thousands to tens of thousands of times of the quiet sun intensity in a short time ( Du et al, 2017 ). These high-intensity signals can enter our radio communication system and seriously interfere with our communication ( Tan, 2007 ).…”

Design of a high-resolution antenna array solar observing system for radio frequencies of 25–110 MHz

“…The solar radiation range from metric to decametric wavelengths contains many fine structures in frequency and time. It is very important to study the entire process of the initial formation and eruption of CME, the dynamic mechanism of the radiation source region and the prediction of space weather (Kallunki et al 2018;Cairns et al 2018;Melnik et al 2018;Mahender et al 2020;Du et al 2017;Ansor et al 2021;Yan et al 2021;Shang et al 2022). Long-term observation of the observational instruments can obtain a vast volume of solar radio data for researchers to study fine structures.…”

“…A high-resolution low-frequency solar radio burst observation system is designed to achieve the scientific objective of fine structure observations. The observation instrument was installed at the CSO with a good electromagnetic environment (Du et al 2017). Three cross-polarised LPDAs are used to receive the solar radio signal.…”