Observation of quasi-periodic solar radio bursts associated with propagating fast-mode waves

Abstract

Radio emission observations from the Learmonth and Bruny Island radio spectrographs are analysed to determine the nature of a train of discrete, periodic radio \lq sparks\rq (finite-bandwidth, short-duration isolated radio features) which precede a type II burst. We analyse extreme ultraviolet (EUV) imaging from SDO/AIA at multiple wavelengths and identify a series of quasi-periodic rapidly-propagating enhancements, which we interpret as a fast wave train, and link these to the detected radio features. The speeds and positions of the periodic rapidly propagating fast waves and the coronal mass ejection (CME) were recorded using running-difference images and time-distance analysis. From the frequency of the radio sparks the local electron density at the emission location was estimated for each. Using an empirical model for the scaling of density in the corona, the calculated electron density was used to obtain the height above the surface at which the emission occurs, and the propagation velocity of the emission location. The period of the radio sparks, $\delta t_{\mathrm{r}}$=1.78$\pm$0.04 min, matches the period of the fast wave train observed at 171 $\mathring{A}$, $\delta t_{\mathrm{EUV}}$=1.7 $\pm$ 0.2 min. The inferred speed of the emission location of the radio sparks, 630 km s${}^{-1}$, is comparable to the measured speed of the CME leading edge, 500 km s${}^{-1}$, and the speeds derived from the drifting of the type II lanes. The calculated height of the radio emission (obtained from the density) matches the observed location of the CME leading edge. From the above evidence we propose that the radio sparks are caused by the quasi-periodic fast waves, and the emission is generated as they catch up and interact with the leading edge of the CME.

arXiv commentAccepted for publication in A&A

References in corpus (16)

• MHD Waves and Coronal Seismology: an overview of recent results
• Automated LASCO CME catalog for solar cycle 23: are CMEs scale invariant?
• Characteristics of EUV coronal jets observed with STEREO/SECCHI
• Quasi-periodic Fast-mode Wave Trains Within a Global EUV Wave and Sequential Transverse Oscillations Detected by SDO/AIA
• Decayless low-amplitude kink oscillations: a common phenomenon in the solar corona?
• Standing Slow-Mode Waves in Hot Coronal Loops: Observations, Modeling, and Coronal Seismology
• Relationship between wave processes in sunspots and quasi-periodic pulsations in active region flares
• Direct Imaging by SDO AIA of Quasi-periodic Fast Propagating Waves of ~2000 km/s in the Low Solar Corona
• A statistical study of decaying kink oscillations detected using SDO/AIA
• Large-scale Bright Fronts in the Solar Corona: A Review of "EIT waves"
• What is the Nature of EUV Waves? First STEREO 3D Observations and Comparison with Theoretical Models
• Observational Study Of the Quasi-Periodic Fast Propagating Magnetosonic Waves and the Associated Flare on 2011 May 30
• Statistical Properties of Quasi-Periodic Pulsations in White-Light Flares Observed With Kepler
• Spatially resolved observations of a split-band coronal type-II radio burst
• The 2010 August 01 type II burst: A CME-CME Interaction, and its radio and white-light manifestations
• Quasi-periodic wiggles of microwave zebra structures in a solar flare

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