Találati lista | Tudóstér

001-es BibID:	BIBFORM114341
035-os BibID:	(WoS)000835781800001 (Scopus)85135636493 (cikkazonosító)155
Első szerző:	Zsámberger Noémi Kinga (csillagász)
Cím:	Solar Magneto-seismology of a Magnetic Slab in an Asymmetric Magnetic Environment / Noémi Kinga Zsámberger, Róbert Erdélyi
Dátum:	2022
ISSN:	0004-637X
Megjegyzések:	Diagnosing the solar atmospheric plasma remains one of the major challenges in solar physics. In recent years, new methods have been developed to apply the powerful concept of solar magneto-seismology (SMS) to obtain information about plasma parameters in solar structures guiding magnetohydrodynamic (MHD) waves that would otherwise be difficult to measure. This paper uses the Cartesian model of a magnetic slab placed in an asymmetric magnetic environment to generalize recently discovered SMS techniques. Utilizing the fact that the asymmetric environment changes the character of the classical kink and sausage eigenmodes, we describe two spatial seismology methods built upon this mixed character of quasi-sausage and quasi-kink modes. First, we present the amplitude ratio technique, which compares the oscillation amplitudes measured at the two boundaries of the slab, and we provide expressions to estimate the internal Alfvén speed in the thin slab and in the incompressible plasma approximations. The second main technique relies on the changed distribution of wave power throughout the slab under the effect of waveguide asymmetry. This minimum perturbation shift technique is then also utilized to provide Alfvén speed estimates that depend on the plasma and magnetic parameters of the environment, as well as the measured slab width and oscillation frequency. Finally, we perform a brief investigation of how the amplitude ratio and the minimum perturbation shift depend on the different sources of waveguide asymmetry, and illustrate our findings with numerical results.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Nap napfizika magnetohidrodinamika MHD naplégkör korona szeizmológia hullámok napkorona
Megjelenés:	Astrophysical Journal. - 934 : 2 (2022), p. 1-10. -
További szerzők:	Erdélyi Róbert
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Saját polcon: