Space Weather
Sun
It is believed that the Sun and Moon can affect spirit activity.
The sun is constantly blasting energy into space. It is thought that this energy can help spirits become more active. When the sun is experiencing a period of high activity, paranormal activity can also increase.
Moon
When the moon is new or full, can it increase spirit energy due to the gravitational forces between the Earth and the Moon? That's one theory.
Earth's magnetic field stores energy and gets stretched. Eventually it gets snapped back toward the earth. This causes the Aurora. Could it also give spirits extra energy? This is why we track space weather during investigations.