Počet záznamů: 1
Density Fluctuations in the Solar Wind Driven by Alfven Wave Parametric Decay
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SYSNO ASEP 0496116 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Density Fluctuations in the Solar Wind Driven by Alfven Wave Parametric Decay Tvůrce(i) Bowen, T.A. (US)
Badman, S. (US)
Hellinger, Petr (ASU-R) RID, ORCID
Bale, S. D. (US)Číslo článku L33 Zdroj.dok. Astrophysical Journal Letters. - : Institute of Physics Publishing - ISSN 2041-8205
Roč. 854, č. 2 (2018)Poč.str. 6 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova instabilities ; plasmas ; solar wind Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GA18-08861S GA ČR - Grantová agentura ČR Institucionální podpora ASU-R - RVO:67985815 UT WOS 000426055900006 EID SCOPUS 85047737260 DOI 10.3847/2041-8213/aaabbe Anotace Measurements and simulations of inertial compressive turbulence in the solar wind are characterized by anti-correlated magnetic fluctuations parallel to the mean field and density structures. This signature has been interpreted as observational evidence for non-propagating pressure balanced structures, kinetic ion-acoustic waves, as well as the MHD slow-mode. Given the high damping rates of parallel propagating compressive fluctuations, their ubiquity in satellite observations is surprising and suggestive of a local driving process. One possible candidate for the generation of compressive fluctuations in the solar wind is the Alfven wave parametric instability. Here, we test the parametric decay process as a source of compressive waves in the solar wind by comparing the collisionless damping rates of compressive fluctuations with growth rates of the parametric decay instability daughter waves. Our results suggest that generation of compressive waves through parametric decay is overdamped at 1 au, but that the presence of slow-mode-like density fluctuations is correlated with the parametric decay of Alfven waves. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2019
Počet záznamů: 1