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The polarization of fast radio bursts (FRBs), bright astronomical transients, contains crucial information about their environments. We report polarization measurements of five repeating FRBs, the abundant signals of which enable wide-band…

Fast radio bursts (FRBs), typically highly polarized, usually have a nearly constant polarization position angle (PA) during each burst. Some bursts show significant PA variations, and one of them was claimed to have a PA variation pattern…

Radio bursts from nearby active M-dwarfs have been frequently reported and extensively studied in solar or planetary paradigms. Whereas, their sub-structures or fine structures remain rarely explored despite their potential significance in…

Solar and Stellar Astrophysics · Physics 2023-08-09 Jiale Zhang , Hui Tian , Philippe Zarka , Corentin K. Louis , Hongpeng Lu , Dongyang Gao , Xiaohui Sun , Sijie Yu , Bin Chen , Xin Cheng , Ke Wang

Nearly 700 fast radio burst (FRB) sources have been detected till now, among which 29 FRBs are found to burst out repeatedly. Although a firm connection between at least some FRBs and magnetars has been established, the trigger mechanism…

High Energy Astrophysical Phenomena · Physics 2023-10-31 Chen-Ran Hu , Yong-Feng Huang

Fast radio bursts (FRBs) are pulsed radio signals with a duration of milliseconds and a large dispersion measure (DM). Recent observations indicate that FRB 180916 and FRB 121102 show periodic activities. Some theoretical models have been…

High Energy Astrophysical Phenomena · Physics 2022-03-11 Y. J. Wei , Z. Y. Zhao , F. Y. Wang

Violent solar eruptions are often accompanied by relativistic beams of charged particles. In the solar context, they are referred to as SPEs (Solar Particle Events) and are known to generate a characteristic swept-frequency radio burst. Due…

Solar and Stellar Astrophysics · Physics 2020-07-15 H. K. Vedantham

Narrowband (~5 MHz) and short-lived (~0.01 s) spikes with three different distributions on the 800-2000 MHz radio spectrum of the 13 June 2012 flare are detected and analyzed. We designate them as SB (spikes distributed in broad band or…

Solar and Stellar Astrophysics · Physics 2022-05-12 M. Karlicky , J. Rybak , J. Benacek , J. Kasparova

The interpretation of solar radio bursts observed by Parker Solar Probe (PSP) in the encounter phase plays a key role in understanding intrinsic properties of the emission mechanism in the solar corona. Lower time-frequency resolution of…

Solar and Stellar Astrophysics · Physics 2021-12-22 Aleksander A. Stanislavsky , Igor N. Bubnov , Artem A. Koval , Serge N. Yerin

Solar Radio Bursts (SRBs) are generally observed in dynamic spectra and have five major spectral classes, labelled Type I to Type V depending on their shape and extent in frequency and time. Due to their complex characterisation, a…

Solar and Stellar Astrophysics · Physics 2021-05-31 Jeremiah Scully , Ronan Flynn , Eoin Carley , Peter Gallagher , Mark Daly

Fast radio bursts (FRBs) are astronomical transients with millisecond timescales. Although most of the FRBs are not observed to repeat, a few of them are detected to repeat more than hundreds of times. There exist a large variety of…

High Energy Astrophysical Phenomena · Physics 2023-04-05 Bo Han Chen , Tetsuya Hashimoto , Tomotsugu Goto , Bjorn Jasper R. Raquel , Yuri Uno , Seong Jin Kim , Tiger Y. -Y. Hsiao , Simon C. -C. Ho

This paper summarizes some recent results in the low-frequency radio physics of the Sun. The spatial domain covers the space from the outer corona to the orbit of Earth. The results obtained make use of radio dynamic spectra and white-light…

Solar and Stellar Astrophysics · Physics 2020-08-24 Nat Gopalswamy

We propose a novel idea for the coherent intense millisecond radio emission of cosmic fast radio bursts (FRBs), which have recently been identified with flares from a magnetar. Motivated by the conventional paradigm of Type III solar radio…

High Energy Astrophysical Phenomena · Physics 2023-11-16 Edison Liang

Solar radio bursts are some of the brightest emissions at radio frequencies in the solar system. The emission mechanisms that generate these bursts offer a remote insight into physical processes in solar coronal plasma, while fine spectral…

Solar and Stellar Astrophysics · Physics 2024-01-10 Pearse C. Murphy , Baptiste Cecconi , Carine Briand , Stéphane Aicardi

Using high-resolution data from the Chashan Broadband Solar radio spectrometer at meter wavelengths (CBSm) of the Chinese Meridian Project-Phase II (CMP-II), Li et al. (2025) identified a novel fine spectral structure of solar radio bursts,…

Solar and Stellar Astrophysics · Physics 2026-04-30 Chuanyang Li , Yao Chen , Bing Wang , Yutong Li , Xiangliang Kong , Hao Ning , Sulan Ni , Shuwang Chang , Zichuan Li , Yang Gao , Zhe Cui , Li Deng , Jingye Yan , Fabao Yan

By assuming the inverse square law of solar wind plasma density as representative of other stars, it is shown that just outside a star the {\it outward} deflection of a passing radio signal at $\nu\approx 1$~GHz (which is capable of…

High Energy Astrophysical Phenomena · Physics 2025-08-11 Richard Lieu

Fine structures of radio bursts play an important role in diagnostics of the solar flare plasma. Among them the zebras, which are prevalently assumed to be generated by the double plasma resonance instability, belong to the most important.…

Solar and Stellar Astrophysics · Physics 2019-04-11 Leonid V. Yasnov , Jan Benáček , Marian Karlický

The radio signature of a shock travelling through the solar corona is known as a type II solar radio burst. In rare cases these bursts can exhibit a fine structure known as `herringbones', which are a direct indicator of particle…

Solar and Stellar Astrophysics · Physics 2015-09-23 Eoin P. Carley , Hamish Reid , Nicole Vilmer , Peter T. Gallagher

Giant pulses (GPs) are extremely bright individual pulses of radio pulsar. In microbursts of Crab pulsar, which is an active GP emitter, zebra-pattern-like spectral structures are observed, which are reminiscent of the `zebra bands' that…

High Energy Astrophysical Phenomena · Physics 2018-11-28 Weiyang Wang , Jiguang Lu , Songbo Zhang , Xuelei Chen , Rui Luo , Renxin Xu

The recently constructed theory of radio wave propagation in the pulsar magnetosphere outlines the general aspects of the radio light curve and polarization formation. It allows us to describe general properties of mean profiles, such as…

High Energy Astrophysical Phenomena · Physics 2020-09-03 A. K. Galishnikova , A. A. Philippov , V. S. Beskin

In this report we present the Type II and IV radio bursts observed and analyzed by the radio spectrograph ARTEMIS IV1, in the 650-20MHz frequency range, during the active period October-November 2003. These bursts exhibit very rich fine…