I produced the following chart from my experimental magnetometer. The magnetometer started recordingvdata at 9:09 PM last night. I wonder if the data looks the way it does because of appliances inside the house turning on and off.
I will leave the magnetometer outside overnight to see what the data looks like. However, the magnetometer is temperature sensitive. Therefore I expect to see changed related to temperature, which I expect will look different from last night and today's data.