Počet záznamů: 1
Magnetoacoustic Waves Propagating along a Dense Slab and Harris Current Sheet and their Wavelet Spectra
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SYSNO ASEP 0428415 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Magnetoacoustic Waves Propagating along a Dense Slab and Harris Current Sheet and their Wavelet Spectra Tvůrce(i) Mészárosová, Hana (ASU-R) RID, ORCID
Karlický, Marian (ASU-R) RID, ORCID
Jelínek, Petr (ASU-R)
Rybák, J. (SK)Celkový počet autorů 4 Zdroj.dok. Astrophysical Journal - ISSN 0004-637X
Roč. 1, č. 788 (2014), s. 44-53Poč.str. 10 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova magnetohydrodynamics (MHD) ; methods: numerical ; Sun: corona ; Sun: flares Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika CEP GAP209/12/0103 GA ČR - Grantová agentura ČR Institucionální podpora ASU-R - RVO:67985815 UT WOS 000337095200044 DOI 10.1088/0004-637X/788/1/44 Anotace Currently, there is a common endeavor to detect magnetoacoustic waves in solar flares. This paper contributes to this topic using an approach of numerical simulations. We studied a spatial and temporal evolution of impulsively generated fast and slow magnetoacoustic waves propagating along the dense slab and Harris current sheet using two-dimensional magnetohydrodynamic numerical models.Wave signals computed in numerical models were used for computations of the temporal and spatial wavelet spectra for their possible comparison with those obtained from observations. It is shown that these wavelet spectra allow us to estimate basic parameters of waveguides and perturbations. It was found that the wavelet spectra of waves in the dense slab and current sheet differ in additional wavelet components that appear in association with the main tadpole structure. These additional components are new details in the wavelet spectrum of the signal. While in the dense slab this additional component is always delayed after the tadpole head, in the current sheet this component always precedes the tadpole head. It could help distinguish a type of the waveguide in observed data.We present a technique based on wavelets that separates wave structures according to their spatial scales. This technique shows not only how to separate the magnetoacoustic waves and waveguide structure in observed data, where the waveguide structure is not known, but also how propagating magnetoacoustic waves would appear in observations with limited spatial resolutions. The possibilities detecting these waves in observed data are mentioned. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2015
Počet záznamů: 1