Specific features of long-period oscillations of sunspots and photosphere according to the MDI (SOHO) data

被引：2
|
作者：
Efremov, V. I. [1 ]
Parfinenko, L. D. [1 ]
Solov'ev, A. A. [1 ]
机构：
[1] Russian Acad Sci, Cent Pulkovo Astron Observ, St Petersburg 196140, Russia
来源：
GEOMAGNETISM AND AERONOMY | 2013年 / 53卷 / 08期
基金：
俄罗斯基础研究基金会;
关键词：
SOLAR OSCILLATIONS; MAGNETOGRAMS; EMISSION;
D O I：
10.1134/S0016793213080045
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
Long-period oscillations of the magnetic field and the line-of-sight velocity have been detected in sunspots based on the synchronous 90-h time series of magnetograms and dopplergrams obtained with the MDI(SOHO) device. The sunspot eigenmode (12-30 h), the periods of which nonlinearly depend on the magnetic field strength, predominates in the magnetic field oscillation spectrum. The mode, which is probably induced by motions of supergranulation cells (33 h), predominates in the sunspot line-of-sight velocity oscillation spectrum. A strong mode (33 h), which indicates that long-period quasi-oscillations of supergranulation exist, was also detected in the velocity power spectrum for a quiet photosphere, together with the known 5-min mode.
引用
收藏
页码：1016 / 1020
页数：5
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