Diamagnetizm of plasma and formation of local decreases of the magnetic fields near the equatorial planeстатья

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[1] Vovchenko V. V., Antonova E. E. Diamagnetizm of plasma and formation of local decreases of the magnetic fields near the equatorial plane // Proceedings of the 38th Annual Seminar (SBN – 978-591137-329-0). — Apatity, 2015. — P. 44–47. We analyze the distribution of the magnetic field at the equatorial plane and plasma pressure using data of the AMPTE/CCE satellite at the equatorial plane and select the formation of local minima of the magnetic field. The main feature of such minima is the decrease of the magnetic field along the satellite trajectory accompanied by the increase of the field. Selected decreases of the magnetic field have the forms of magnetic holes. More than hundred magnetic holes are selected at all local times. Comparatively stable character of magnetic field decreases leads to the suggestion about quasistable character of observed magnetic holes. The formation of local minima of the magnetic field near midnight is traditionally explanation as the result of the magnetic field distortion by tail current near its near Earth boundary. However the formation of magnetic holes can be connected with the local increases of plasma pressure in the magnetic trap in the conditions of magnetostatic equilibrium due to the diamagnetism of plasma. Action of such mechanism becomes rather probable due to observations of magnetic holes in all MLT sectors. We select the event 06 June 1985 when the increase of plasma pressure (pressure hump) was observed simultaneously with the pressure hole. The nonlinear modeling of the magnetic field distortion by the observed pressure hump shows that the magnetic hole observed 06 June 1985 is the result of the diamagnetic effect of hot magnetospheric plasma.

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