Detector for fast wave trains in the solar radio emission

Abstract

Abstract Quasi-periodic fast propagating (QFP) wave trains observed in the solar corona after some energetic events (solar flares, coronal mass ejections, jets) open possibilities for diagnostics of spatial and temporal scales of the impulsive energy release processes that are absent in the standard model of a solar flare. In addition, the dynamics of the wave trains and their characteristic spatial and temporal signatures allow for localizing the initial energy release volume magenta and to perform fine diagnostics of the transverse structures of plasma inhomogeneities in the solar corona. However, the small number of such events registered significantly limits their promising diagnostic potential. The aim of this paper is to perform an automatic search for fast wave trains in radio data. We apply classifying neural network/machine learning methods. Dynamic radio spectra obtained by Hiraiso radio spectrograph (HiRAS) radio spectrographs within the 20 MHz–2.5 GHz frequency band during 2011 were used. We consider 50 global coronal extreme ultraviolet (EUV) waves as marker events for a more targeted search in HiRAS data. Our automatic detector revealed 50 independent QFP-candidate events with temporal signatures similar to those of the fast wave trains, with 13 candidates connected with the global waves. This article is part of the theme issue ‘Transferable mechanisms in the oscillatory processes of solar and stellar flares’.

The authors' abstract, as published at the source. Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences, 2026 · DOI ↗