[amorphous]

InSight is near Mars’ equator, and in the same geographic position on Earth, at that time of night, you don’t see these types of magnetic pulsations. Night-time pulsations on Earth tend to happen at higher latitudes and are linked to the northern and southern lights. Right now, the ones on Mars have no clear source, but scientists have at least one suspect in mind.”

Good points. Local midnight means opposition to the solar-wind which likely has a stronger effect on Mars' weak magnetic field. Likely this effect can then be measured at Insight's location vs. Earth's much stronger magnetic field which isn't noticeably affected by changes in solar wind direction during planet rotation. Jest my SWAG... :)

[tired&retired]

Good point. Thanks