I am observing the Sun with a small radio telescope for a research project. I am measuring the intensity of the flux and comparing it to X-ray flux data from the NOAA. I am plotting radio flux intensity against time and i get a big "hump" in the middle of the day due to less atmospheric interference, I want to eliminate the "hump" but haven't been able to figure out how, I have tried linear, logarithmic, and exponential trendlines to try to get it out and have a nice smooth curve with no luck. The big problem is that the x axis is time so means nothing in line equations! I need to get this "hump out so I will have a nice smooth curve and be able to see spikes and be able to compare it with the X-ray data and start doing the real work! Any tips or ideas on what to do?