Fine Structure of Metric Type IV Radio Bursts Observed with the ARTEMIS-IV Radio-Spectrograph: Association with Flares and Coronal Mass Ejections

Fine structures embedded in type IV burst continua may be used as diagnostics of the magnetic-field restructuring and the corresponding energy release associated with the low-corona development of flare or coronal mass ejection (CME) events. A catalog of 36 type IV bursts observed with the SAO recei...

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Bibliographic Details
Published in:Solar physics 2015-01, Vol.290 (1), p.219-286
Main Authors: Bouratzis, C., Hillaris, A., Alissandrakis, C. E., Preka-Papadema, P., Moussas, X., Caroubalos, C., Tsitsipis, P., Kontogeorgos, A.
Format: Article
Language:English
Subjects:
Astrophysics and Astroparticles
Atmospheric Sciences
Broadband
Bursting
Categories
Coronal mass ejection
Emissions
Energy
Fibers
Fine structure
Flares
Magnetic fields
New Eyes Looking At Solar Activity
Physics
Physics and Astronomy
Radio astronomy
Radio bursts
Solar activity
Solar flares
Solar physics
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Sun
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Summary:Fine structures embedded in type IV burst continua may be used as diagnostics of the magnetic-field restructuring and the corresponding energy release associated with the low-corona development of flare or coronal mass ejection (CME) events. A catalog of 36 type IV bursts observed with the SAO receiver of the ARTEMIS-IV solar radio-spectrograph in the 450 – 270 MHz range at high cadence (0.01 sec) was compiled; the fine structures were classified into five basic classes with two or more subclasses each. The time of fine-structure emission was compared with the injection of energetic electrons as recorded by hard X-ray and microwave emission, the soft X-ray (SXR) light curves and the CME onset time. Our results indicate a very tight temporal association between energy release episodes and pulsations, spikes, narrow-band bursts of the type III family, and zebra bursts. Of the remaining categories, the featureless broadband continuum starts near the time of the first energy release, between the CME onset and the SXR peak, but extends for several tens of minutes after that, covering almost the full extent of the flare–CME event. The intermediate drift bursts, fibers in their majority, mostly follow the first energy release, but have a wider distribution than other fine structures.
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-014-0562-2