I don't know that I have seen perceptible changes of integrate magnitude.
我不知道我是否看到了整体幅度的可察觉变化。
英语百科
Surface brightness
The overall brightness of an extended astronomical object such as a galaxy, star cluster, or nebula, can be measured by its total magnitude, integrated magnitude or integrated visual magnitude; a related concept is surface brightness, which specifies the brightness of a standard-sized piece of an extended object.