Significance Maps Question

1. vaart

7
Dear All,

I have a question regarding the understanding of anisotropy of cosmic rays and how to understand them better. To determine the anisotropy I have seen a lot of papers where they use maps that have a Relative Intensity map and a Statistical significance map of the sky.

I understand the relative intensity map, but I don't understand why the statistical significance maps are used, could some one explain this to me?

Thanks,

caart

Staff: Mentor

Hmmm... do you happen to have a link to one of the maps?

7

Staff: Mentor

I'm actually not certain. At first glance I would think that the significance level depends on the intensity of the radiation and the observation time, with a higher significance corresponding to a higher chance that the signal is real and not a background fluctuation, but I'm not sure why the significance level goes into the negative.