The flux density structure functions of PSRs B0525+21 and B2111+46 are calculated with the refractive inter-stellar scintillation (RISS) theory. The theoretical curves are in good agreement with observations [Astrophys. J. 539 (2000) 300] (hereafter S2000). The spectra of the electron density fluctuations both are of Kolmogorov spectra. We suggest that the flux density variations observed for these two pulsars are attributed to refractive interstellar scintillation, not to intrinsic variability.
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机译：PSR B0525 + 21和B2111 + 46的磁通密度结构函数是通过折射星际闪烁（RISS）理论计算得出的。理论曲线与观测值[天体。 J. 539（2000）300]（以下称为S2000）。电子密度涨落的光谱均为Kolmogorov光谱。我们建议观察到的这两个脉冲星的通量密度变化归因于星际折射星际闪烁，而不是固有变化。
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