色球局部极性反变现象的一个例证

AN EXAMPLE OF LOCALIZED CHROMOSPHERIC POLARITY REVERSAL

在一快速形成的太阳黑子上空,在色球层观测到与光球相反的极性发展,反变极性的强度达几百高斯,围绕反变极性,前后9小时内观测到7个亚耀斑。耀斑尺寸和扩展范围随反变极性的发展而增大。单一极性磁场上空的双极特征,只能表明在光球上空磁力线在垂直方向被扭曲、缠绕、打结或出现封闭磁环。

In the chromosphere, a localized magnetic feature with polarity opposite to the underlying photospheric magnetic field is observed above a fast formed sunspot. The strength of this re- versal polarity is as strong as several gundred gauss. Centering around the reversal polarity, 7 subflares are observed during 9 hours btfore and after the reversal. Each flare shows progres sively increasing size and spacial ekttnt with the development of the veversal polarity. The reversal polarity above the photosphere can only mean that the magnetic lines of force have been kinked, twisted or knotted, or a close flux system has been formed above the photo- sphere. This newly observed phenomenon has not yet been able to predict by either the current sunspot models, or flare models.