Solar Flare and Geomagnetic Field activities seem to affect the amount of paranormal activity. Researchers have found that during periods of heightened solar flare activity and geomagnetic activity in space, paranormal activity has increased. M class and X class flares are good sources of energy for the spirits to use to manifest. Spirits often drain electrical sources such as appliances and batteries to gain this energy. On days when the air is full of surplus energy due to a solar storm or flare, they have plenty of energy to tap into. This is also important because it may cause negative affects with the more sensitive EMF detectors, like the Trifield EM meter, giving you false positive readings.
As the moon circles the Earth, the shape of the moon appears to change; this is because different amounts of the illuminated part of the moon are facing us. The shape varies from a full moon (when the Earth is between the sun and the moon) to a new moon (when the moon is between the sun and the Earth). When the shape changes, it also affects on the geomagnetic fields. Most believe that the magnetic fields are the strongest on the days around the full and new moon cycles. Spirit activity is found to be more prominent during these times.
The images below show the different phases of the moon.