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Publication . Article . 2008

Enhanced Rieger-type periodicities' detection in X-ray solar flares and statistical validation of Rossby waves' existence

Michaila Dimitropoulou; Xenophon Moussas; Dafni Strintzi;
Open Access
Published: 01 Jun 2008 Journal: Monthly Notices of the Royal Astronomical Society, volume 386, pages 2,278-2,284 (issn: 0035-8711, eissn: 1365-2966, Copyright policy )
Publisher: Oxford University Press (OUP)
Abstract

The known Rieger periodicity (ranging in literature from 150 up to 160 d) is obvious in numerous solar indices. Many subharmonic periodicities have also been observed (128-, 102-, 78- and 51-d) in flare, sunspot, radio bursts, neutrino flux and flow data, coined as Rieger-type periodicities (RTPs). Several attempts are focused to the discovery of their source, as well as the explanation of some intrinsic attributes that they present, such as their connection to extremely active flares, their temporal intermittency as well as their tendency to occur near solar maxima. In this paper, we link the X-ray flare observations made on Geosynchronous Operational Environmental Satellites (GOES) to the already existing theoretical Lou model, suggesting that the mechanism behind the RTPs is the Rossby-type waves. The enhanced data analysis methods used in this article (Scargle-Lomb periodogram and Weighted Wavelet Z-Transform) provide the proper resolution needed to argue that RTPs are present also in less energetic flares, contrary to what has been inferred from observations so far.

Subjects by Vocabulary

Microsoft Academic Graph classification: Astronomy Neutrino Rossby wave Flare law.invention law Solar flare Intermittency Data analysis Sunspot Physics Astrophysics Flux

Subjects

Space and Planetary Science, Astronomy and Astrophysics

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