A study of the relation between intensity oscillations and magnetic field parameters in a sunspot: Hinode observations

A study of the relation between intensity oscillations and magnetic field parameters in a sunspot: Hinode observations
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太阳黑子强度振荡与磁场参数之间关系的研究:Hinode 观测

DOI:
10.1088/1674-4527/14/11/009
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发表时间:
2014
影响因子:
1.8
通讯作者:
Bayanna A
Bayanna A
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Bayanna A

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我们提出的性质的强度振荡的太阳黑子在光球和色球层使用G波段和Ca II H滤波图从Hinode。作为磁场强度和频率函数的强度功率图显示,随着所有频率光球磁场强度的增加,G波段的功率都会降低。然而,在Ca II H中,较强的场在高频下表现出更大的功率,特别是在4.5-8.0 mHz频带中。在不同位置的活性区的功率分布表明,在Ca II H的振荡表现出更多的功率相比,G带。我们还涉及到的功率强度振荡与光球矢量磁场的不同组成部分,使用近同时光谱偏振观测太阳黑子的日之出分光偏振仪。光球本影功率与磁场强度及其视线分量有很强的反相关性,而与横向分量有很好的相关性。在色球层中,除了低频(ν≤ 1.5 mHz)外,观察到这种趋势的逆转。在光球和色球的所有频率(1.0≤ ν≤ 8.0 mHz)下,黑子半影的功率与磁场参数都是反相关的,只有色球功率在3-3.5 mHz的频率范围内表现出强相关。
We present properties of intensity oscillations of a sunspot in the photosphere and chromosphere using G band and Ca II H filtergrams from Hinode. Intensity power maps as function of magnetic field strength and frequency reveal reduction of power in the G band with an increase in photospheric magnetic field strength at all frequencies. In Ca II H, however, stronger fields exhibit more power at high frequencies, particularly in the 4.5–8.0 mHz band. Power distributions in different locations of the active region show that the oscillations in Ca II H exhibit more power compared to that of the G band. We also relate the power in intensity oscillations with different components of the photospheric vector magnetic field using near simultaneous spectro-polarimetric observations of the sunspot from the Hinode spectropolarimeter. The photospheric umbral power is strongly anti-correlated with the magnetic field strength and its line-of-sight component but there is a good correlation with the transverse component. A reversal of this trend is observed in the chromosphere except at low frequencies (ν≤ 1.5 mHz). The power in sunspot penumbrae is anti-correlated with the magnetic field parameters at all frequencies (1.0≤ ν≤ 8.0 mHz) in both the photosphere and chromosphere, except that the chromospheric power shows a strong correlation in the frequency range 3–3.5 mHz.
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