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The magnetosphere varies depending on the Solar Wind and in what direction you take the measurement (i.e. towards or away from the Sun). As the earths magnetic field originates from the centre of the Earth all the measurements are taken from this point.

On the side of the Earth facing the Sun the magnetosphere extends to approximately 70,000km (about 43500 miles). On the night side of the Earth it reaches 127,000km to 160,000km (79,000 miles to 99500 miles). The 'Tail' of the megontosphere however can reach well beyond 1,274,000km (792,000 miles).


The reason for this huge difference is the Solar Wind. The Solar Wind is a constant stream of charged particles emanating from the sun which is constantly buffeting the magnetosphere into this long shape.

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