What question did this study set out to answer?

This research aims to define the boundary of the geomagnetic field on the sunlit side of Earth.

The boundary of the geomagnetic field

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Randomized trial investigates geomagnetic field boundaries in space, suggesting stability in magnetic fluctuations.

This research aims to define the boundary of the geomagnetic field on the sunlit side of Earth.
A three-component magnetometer was used on Explorer 12.
The observation period focused on magnetically quiet conditions near the earth-sun line.
Magnetic field measurements were recorded outside the geomagnetic boundary.
The geomagnetic boundary was found approximately 10 earth radii from the Earth.
Magnetic field strengths of 30 to 40 gammas were observed outside the boundary, usually directed downwards.
Fluctuations inside the boundary were relatively small compared to those outside.

Cahill et al. (1963) studied this question.

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