AstroSat上大面积X射线正比计数器（LAXPC）仪器的改进背景模型
Improved background model for the Large Area X-ray Proportional Counter (LAXPC) instrument on-board AstroSat
摘要：
我们提出了一个改进的背景模型的大面积X射线正比计数器（LAXPC）探测器上的AstroSat。由于大收集面积和高压，LAXPC仪器具有大的背景计数率，该计数率在轨道期间变化。除了在轨道上随纬度和经度的变化，还有一个突出的准日变化，这是以前没有模拟。使用超过5年的背景观测，我们确定了准日变化的周期为84495 s，使用这个周期，可以解释变化，并确定拟合不好的时间间隔。这些导致背景模型的显著改进。准日变化可以归因于近地轨道带电粒子通量的变化。
英文摘要：
We present an improved background model for the Large Area X-ray Proportional Counter (LAXPC) detectors on-board AstroSat. Because of the large collecting area and high pressure, the LAXPC instrument has a large background count rate, which varies during the orbit. Apart from the variation with latitude and longitude during the orbit there is a prominent quasi-diurnal variation which has not been modelled earlier. Using over 5 years of background observations, we determined the period of the quasi-diurnal variation to be 84495 s and using this period, it is possible to account for the variation and also identify time intervals where the fit is not good. These lead to a significant improvement in the background model. The quasi-diurnal variation can be ascribed to the changes in charged particle flux in the near Earth orbit.
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