Topic
Dipole model of the Earth's magnetic field
About: Dipole model of the Earth's magnetic field is a research topic. Over the lifetime, 2756 publications have been published within this topic receiving 83021 citations.
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TL;DR: In this article, the authors investigated the electron-positron pair creation process in a supercritical static electric field in the presence of a static magnetic field that is perpendicular and showed that a significant amount of suppression of pair creation was observed in the simulations and confirmed by analytical analysis for the limits of short-range fields and long interaction times.
Abstract: We investigate the electron-positron pair creation process in a supercritical static electric field in the presence of a static magnetic field that is perpendicular. If both fields vary spatially in one direction the dynamics can be reduced to a set of one-dimensional systems. Using a generalized computational quantum field theoretical procedure, we calculate the time dependence of the spatial density for the created electrons. In the presence of the magnetic field, a significant amount of suppression of pair creation is observed in the simulations and confirmed by an analytical analysis for the limits of short-range fields and long interaction times. This suppression might be interpreted in terms of Pauli blocking by the electron during its return to the creation region as it performs a cyclotronlike motion in the magnetic field.
19 citations
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09 Aug 1990TL;DR: In this article, the magnitude and direction of the residual magnetic field or dipole of an orbiting spacecraft is estimated from the attitude-perturbing effects of its interaction with the magnetic field of the heavenly body about which it orbits.
Abstract: The magnitude and direction of the residual magnetic field or dipole of an orbiting spacecraft is estimated from the attitude-perturbing effects of its interaction with the magnetic field of the heavenly body about which it orbits. The measurements are performed over a significant portion of an orbit. The estimate uses h, the total spacecraft momentum in the body frame, and its body angular rate ω. The Earth's magnetic flux density B is determined either by magnetometer measurements, or by recourse to stored historical and ephemeris information.
19 citations
TL;DR: The results of microwave observations of the polarized emission of active regions made with the RATAN-600 radio telescope are used to develop the method for determining the structure of the magnetic field of these regions at coronal heights.
Abstract: The results of microwave observations of the polarized emission of active regionsmade with the RATAN-600 radio telescope are used to develop the method for determining the structure of the magnetic field of these regions at coronal heights. About 1000-G-strong magnetic fields are observed in the solar atmosphere at rather high altitudes (from 10 to 25 Mm). This result is confirmed fairly well by the ultraviolet observations of magnetic loops, it is consistent with earlier radio-astronomical observations of the magnetic field at the height of the transition region, and it corresponds as well, if interpreted in terms of the dipole magnetic field model, to the vertical gradients of the photospheric magnetic field.
19 citations
TL;DR: In this article, the strong intermittent nature of the interplanetary magnetic field is discussed and the similarity between its statistical properties and the passive scalar ones exists, and may arise from different dynamical mechanisms.
Abstract: We briefly discuss the strong intermittent nature of the interplanetary magnetic field, observing that similarity between its statistical properties and the passive scalar ones exists, and may arise from different dynamical mechanisms.
19 citations
TL;DR: In this paper, an exact relation describing bound-particle orbits in the equatorial plane of a dipole magnetic field was derived and an exact expression for the average angular velocity of the particle about the dipole axis was obtained.
Abstract: An exact relation is derived describing bound-particle orbits in the equatorial plane of a dipole magnetic field. An exact expression is then obtained for the average angular velocity of the particle about the dipole axis. The corresponding drift velocity is compared with the usual first-order expression based on a constant local field gradient. It is shown that the first- order expression for the drift velocity can be considerably in error when the particle loops are not small compared with the mean distance from the dipole axis.
19 citations