Periodic variations of the Hα profile width in the chromosphere of coronal holes as a possible indicator of Alfvén waves

Autor:	A. A. Sklyar, R. I. Kostyk, A. V. Zubkova, N. G. Shchukina, N. I. Kobanov
Rok vydání:	2014
Předmět:	Physics Space and Planetary Science Physics::Space Physics Astrophysics::Solar and Stellar Astrophysics Astronomy Coronal hole Astronomy and Astrophysics Astrophysics Solar atmosphere Oscillation amplitude Corona Chromosphere Intensity (physics)
Zdroj:	Astronomy Letters. 40:222-229
ISSN:	1562-6873 1063-7737
DOI:	10.1134/s1063773714030104
Popis:	We analyze the oscillations of the Hα profile width based on our observations of the chromosphere at the base of solar coronal holes. The maximum oscillation amplitude averaged over ten time series is 64 m 0 A. Direct calculations show that this value cannot be reached through temperature oscillations, because the periodic intensity fluctuations observed during our experiment did not exceed 5%, corresponding to Hα profile broadening only by 1.5–2 m A. We hypothesize that the observed variations can result from the propagation of torsional Alfven waves in the chromosphere of coronal holes.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d0ad86f352ea946bfec1efa00a76cb4d https://doi.org/10.1134/s1063773714030104 Zobrazit plný text záznamu Plný text ve formátu PDF