Statistical Moments of Active-Region Images During Solar Flares

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F14%3A00399766" target="_blank" >RIV/67985815:_____/14:00399766 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985556:_____/14:00399766

Výsledek na webu

<a href="http://dx.doi.org/10.1007/s11207-013-0334-4" target="_blank" >http://dx.doi.org/10.1007/s11207-013-0334-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11207-013-0334-4" target="_blank" >10.1007/s11207-013-0334-4</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Statistical Moments of Active-Region Images During Solar Flares

Popis výsledku v původním jazyce

We present new temporal-evolution diagnostics of solar flares. The high-order statistical moments (skewness and kurtosis) of the H? 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 H? statistical moments during flares roughly correspond to those observed in soft X-rays by the GOES satellite. Maxima of the cross-correlation coefficientsbetween 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 determinethe 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

Název v anglickém jazyce

Statistical Moments of Active-Region Images During Solar Flares

Popis výsledku anglicky

We present new temporal-evolution diagnostics of solar flares. The high-order statistical moments (skewness and kurtosis) of the H? 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 H? statistical moments during flares roughly correspond to those observed in soft X-rays by the GOES satellite. Maxima of the cross-correlation coefficientsbetween 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 determinethe 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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Solar Physics

ISSN

0038-0938

e-ISSN

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Svazek periodika

289

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

193-209

Kód UT WoS článku

000327094700013

EID výsledku v databázi Scopus

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