Periodic Variations of the Ba II 4554 Å and Ca II 8542 Å Line Profiles in Coronal Holes

被引：4
|
作者：
Kobanov, N. I. [1 ]
Chupin, S. A. [1 ]
Kolobov, D. Yu. [1 ]
机构：
[1] Russian Acad Sci, Inst Solar Terr Phys, Siberian Branch, POB 291, Irkutsk 664033, Russia
来源：
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS | 2016年 / 42卷 / 01期
基金：
俄罗斯基础研究基金会;
关键词：
solar atmosphere; coronal holes; Alfven waves; LOWER SOLAR ATMOSPHERE; ALFVEN WAVES; TRANSITION REGION; CHROMOSPHERIC OSCILLATIONS; KINK OSCILLATIONS; MAGNETIC-FIELD; SPECTRAL-LINES; VELOCITY; SUNSPOT; SUN;
D O I：
10.1134/S1063773716010047
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The oscillations of the half-width of the Ba II 4554 angstrom and Ca II 8542 angstrom spectral lines have been analyzed using observations at the base of solar coronal holes (CHs). The observed variations (similar to 50 m angstrom for Ca II and similar to 4 m angstrom for Ba II) exceed considerably the thermal broadenings of these lines calculated from the measured intensity oscillations, suggesting their nonthermal nature. We point out a number of observational facts that hamper an unambiguous interpretation of the periodic Ba II and Ca II profile variations solely by the manifestation of torsional Alfven waves in the lower solar atmosphere.
引用
收藏
页码：55 / 62
页数：8
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