Issues with time-distance inversions for supergranular flows (Research Note)

Kód výsledku v IS VaVaI

RIV/00216208:11320/15:10315904 - isvavai.cz

Nalezeny alternativní kódy

RIV/67985815:_____/15:00450664

Výsledek na webu

http://dx.doi.org/10.1051/0004-6361/201425203

DOI - Digital Object Identifier

10.1051/0004-6361/201425203

Jazyk výsledku

angličtina

Název v původním jazyce

Issues with time-distance inversions for supergranular flows (Research Note)

Popis výsledku v původním jazyce

Aims. Recent studies have shown that time-distance inversions for flows start to be dominated by a random noise at a depth of only a few Mm. It was proposed that the ensemble averaging might be a solution for learning about the structure of the convective flows, e.g. about the depth structure of supergranulation. Methods. Time-distance inversion is applied to the statistical sample of similar to 10(4) supergranules, which allows the inversion cost function to be regularised weakly about the random-noiseterm and thus provides a much better localisation in space. We compare these inversions at four depths (1.9, 2.9, 4.3, and 6.2 Mm) when using different spatio-temporal filtering schemes in order to gain confidence about these inferences. Results. The flows inferred by using different spatio-temporal filtering schemes are different (even by the sign) even though the formal averaging kernels and the random-noise levels are very similar. The inverted flows changes its sign several times wi

Název v anglickém jazyce

Issues with time-distance inversions for supergranular flows (Research Note)

Popis výsledku anglicky

Aims. Recent studies have shown that time-distance inversions for flows start to be dominated by a random noise at a depth of only a few Mm. It was proposed that the ensemble averaging might be a solution for learning about the structure of the convective flows, e.g. about the depth structure of supergranulation. Methods. Time-distance inversion is applied to the statistical sample of similar to 10(4) supergranules, which allows the inversion cost function to be regularised weakly about the random-noiseterm and thus provides a much better localisation in space. We compare these inversions at four depths (1.9, 2.9, 4.3, and 6.2 Mm) when using different spatio-temporal filtering schemes in order to gain confidence about these inferences. Results. The flows inferred by using different spatio-temporal filtering schemes are different (even by the sign) even though the formal averaging kernels and the random-noise levels are very similar. The inverted flows changes its sign several times wi

Druh

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

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

—

Projekt

GPP209/12/P568: Konvekce a pohyby plazmatu v přípovrchové vrstvě sluneční konvektivní zóny

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Astronomy and Astrophysics [online]

ISSN

1432-0746

e-ISSN

—

Svazek periodika

575

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

8

Strana od-do

—

Kód UT WoS článku

000360710400023

EID výsledku v databázi Scopus

2-s2.0-84924709836