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Flare-Induced Excitation of Solar p modes

机译:耀斑诱导的太阳p模式激发

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摘要

Solar flares release large amounts of energy at different layers of the solar atmosphere, including at the photosphere in the case of exceptionally major events. Therefore, it is expected that large flares would be able to excite acoustic waves on the solar surface, thereby affecting the p-mode oscillation characteristics. We have applied the ring-diagram analysis technique to 3-D power spectra obtained for different flare regions in order to study how flares affect the amplitude, frequency and width of the acoustic modes. Data from the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory (SOHO) has been used. We have used data obtained for several active regions of the current solar cycle that have produced flares. In most cases, during the period of high flare activity, power in p modes appears to be larger when compared to that in non-flaring regions of similar magnetic field strength.
机译:太阳耀斑会在太阳大气的不同层释放大量能量,包括发生重大事件时在光层释放的能量。因此,期望大的耀斑将能够在太阳表面上激发声波,从而影响p模式振荡特性。为了研究耀斑如何影响声模的幅度,频率和宽度,我们将环形图分析技术应用于针对不同耀斑区域获得的3D功率谱。使用了太阳和日球天文台(SOHO)上的迈克尔逊多普勒成像仪(MDI)的数据。我们使用从当前太阳周期几个活跃区域获得的数据产生了耀斑。在大多数情况下,在高火炬活动期间,与具有类似磁场强度的非火炬区域相比,p模式下的功率似乎更大。

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  • 来源
    《Solar Physics》 |2003年第2期|151-172|共22页
  • 作者单位

    Udaipur Solar Observatory Physical Research Laboratory;

    Astronomy Department Yale University;

    Tata Institute of Fundamental Research;

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  • 正文语种 eng
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