Long-period oscillations of millimeter emission above sunspots

被引：17

作者：

Smirnova, V. ^{[1
,2
]}

Riehokainen, A. ^{[1
]}

Ryzhov, V. ^{[3
]}

Zhiltsov, A. ^{[3
]}

Kallunki, J. ^{[1
,4
]}

机构：

[1] Univ Turku, Turku 20014, Finland

[2] St Petersburg State Univ, Sobolev Astron Inst, St Petersburg 198504, Russia

[3] Bauman Moscow State Tech Univ, Moscow 105005, Russia

[4] Aalto Univ, Metsahovi Radio Observ, Kylmala, Finland

来源：

ASTRONOMY & ASTROPHYSICS | 2011年 / 534卷

关键词：

Sun: oscillations; Sun: radio radiation; SOLAR MICROWAVE EMISSION; RADIO-EMISSION;

D O I：

10.1051/0004-6361/201117483

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. The investigation of long quasi-periodic oscillations in sunspots/active regions based on millimeter radio data was the main goal of this work. Methods. Data from simultaneous monitoring observations of solar active regions at 37 GHz and 93 GHz at two different groundbased radio telescopes were obtained. We analyzed them with the methods of wavelet (Morlet) and global wavelet spectrum analysis. Results. Two main ranges (10-60 and 80-130 min) of long quasi-periodic oscillations were found. We compared them with 17 GHz Nobeyama Radioheliograph (NoRH) data and obtained the same ranges for the long-period oscillations. The long-period oscillations found in this study are relatively stable and could be interpreted as a radial mode of sunspot oscillations.

引用

页数：6

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