An open magnetopause model of the earth's distant tail based on ISEE 3 evidence

Astronomy and Astrophysics – Astronomy

Scientific paper

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Geomagnetic Tail, International Sun Earth Explorers, Magnetopause, Plasma Equilibrium, Astronomical Models, Earth Magnetosphere, Magnetohydrodynamic Stability

Scientific paper

An open hydromagnetic equilibrium model of the earth's distant magnetotail is discussed which can account for the gross features of the cross-tail dimensions, the magnetic field intensity, and the average plasma density in the tail lobes determined from ISEE 3 measurements. The tail flaring rate is found to decrease downstream at X of about -(100-120) earth radii, beyond which a noncircular flattened tail is predicted. The most probable flattened tail, elongated in the east-west direction, is obtained with an east-west/north-south dimension ratio of 1.4-1.7 at X of about -200 earth radii. Results indicate that about 0.1 of the ambient interplanetary magnetic field lines become connected to the lobe field lines.

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