About: Statistical Moments of Active-Region Images During Solar Flares

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	We present new temporal-evolution diagnostics of solar flares. The high-order statistical moments (skewness and kurtosis) of the Hα images of active regions during solar flares were computed from their initial phases up to their maxima. The same method was used for quiet active regions for tests and comparison. We found that temporal profiles of the Hα statistical moments during flares roughly correspond to those observed in soft X-rays by the GOES satellite. Maxima of the cross-correlation coefficients between the skewness and the GOES X-rays were found to be 0.82 – 0.98, and the GOES X-rays are delayed 0 – 144 seconds against the skewness. We recognized that these moments are very sensitive to pre-flare activities. Therefore we used them to determine the flare starting-time and to study the pre-flare quasi-periodic processes. We determined the periods of these pre-flare processes in an interval of 20 – 400 seconds by using special convolution filters and Fourier analysis. We propose to use this method to analyze active regions during the very early phases of solar flares, and even in real time. We present new temporal-evolution diagnostics of solar flares. The high-order statistical moments (skewness and kurtosis) of the Hα images of active regions during solar flares were computed from their initial phases up to their maxima. The same method was used for quiet active regions for tests and comparison. We found that temporal profiles of the Hα statistical moments during flares roughly correspond to those observed in soft X-rays by the GOES satellite. Maxima of the cross-correlation coefficients between the skewness and the GOES X-rays were found to be 0.82 – 0.98, and the GOES X-rays are delayed 0 – 144 seconds against the skewness. We recognized that these moments are very sensitive to pre-flare activities. Therefore we used them to determine the flare starting-time and to study the pre-flare quasi-periodic processes. We determined the periods of these pre-flare processes in an interval of 20 – 400 seconds by using special convolution filters and Fourier analysis. We propose to use this method to analyze active regions during the very early phases of solar flares, and even in real time. (en)
Title	Statistical Moments of Active-Region Images During Solar Flares Statistical Moments of Active-Region Images During Solar Flares (en)
skos:prefLabel	Statistical Moments of Active-Region Images During Solar Flares Statistical Moments of Active-Region Images During Solar Flares (en)
skos:notation	RIV/67985815:_____/14:00399766!RIV15-GA0-67985815
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA102/08/1593), P(GAP103/11/1552), P(GAP209/12/0103)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Karlický, Marian Šimberová, Stanislava
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Astronomický ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	47343
http://linked.open...ai/riv/idVysledku	RIV/67985815:_____/14:00399766
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Sun; solar flares; frequency analysis (en)
http://linked.open.../riv/klicoveSlovo	frequency analysis solar flares Sun
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[6F1CF2175DB7]
http://linked.open...i/riv/nazevZdroje	Solar Physics
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Mathematical methods for resolution enhancement of digital images and their applications in astronomy Radio and X-ray diagnostics of primary-energy-release processes in solar flares and their numerical simulations Moments and Moment Invariants in Image Analysis
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	289
http://linked.open...iv/tvurceVysledku	Karlický, Marian Suk, Tomáš Šimberová, Stanislava
http://linked.open...ain/vavai/riv/wos	000327094700013
issn	0038-0938
number of pages	17 (xsd:int)
http://bibframe.org/vocab/doi	10.1007/s11207-013-0334-4

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