Satellite Magnetic Field Mapping
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Total Pages | : 28 |
Release | : 1961 |
Genre | : Satellites |
ISBN | : |
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Author | : |
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Total Pages | : 28 |
Release | : 1961 |
Genre | : Satellites |
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Author | : James P. Heppner |
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Total Pages | : 1 |
Release | : 1961 |
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A PRELIMINARY ANALYSIS IS MADE OF DATA FROM THE Vanguard III satellite (1959 ETA). The resulting scalar field measurements are plotted against computed values obtained from three differentANALYSES: Finch and Leaton coefficients, Jensen and Whitaker coefficients from U.S.N.H.O. charts, and Jensen and Whitaker coefficients from Russian charts. The topics discussed include: The accuracy of spherical harmonic analyses of the earth's field, possible magnetic field discontinuities associated with the inner radiation belt, and magnetic storm effects. (Author).
Author | : R. A. Langel |
Publisher | : Cambridge University Press |
Total Pages | : 444 |
Release | : 1998-07-13 |
Genre | : Science |
ISBN | : 9780521473330 |
This 1998 book documents the collection, processing and analysis of satellite magnetic field data.
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Total Pages | : 4 |
Release | : 1994 |
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The distortion of the geomagnetic field is a key signature of the response of the magnetosphere to the solar wind input. A number of empirical models have been devised to estimate the magnetic field direction and magnitude at any point within the magnetosphere under a variety of conditions. We describe a technique whereby the field-line mapping predicted by such models is tested by matching measurements of magnetospheric plasma energy spectra obtained by Los Alamos instruments at geosynchronous orbit with spectra obtained by instruments on the polar-orbiting DMSP satellites (at an altitude of about 800 km) at times when the two satellites are in approximate magnetic conjugacy. With up to three geosynchronous satellites and as many as four DMSP satellites in operation at any given time, there are a very large number of such two-satellite conjunctions, allowing the model mappings to be tested under a wide range of local times and geomagnetic activity. Preliminary results from the application of this technique are presented for one week of data from March, 1991.
Author | : R. L. Coles |
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Total Pages | : |
Release | : 1990 |
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Author | : James P. Heppner |
Publisher | : |
Total Pages | : 20 |
Release | : 1961 |
Genre | : Satellites |
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Total Pages | : 122 |
Release | : 1990 |
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Total Pages | : 438 |
Release | : 1963 |
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Author | : James P. Heppner |
Publisher | : |
Total Pages | : 1 |
Release | : 1961 |
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Mapping of the earth's magnetic field with satellites is of primary importance in the World Magnetic Survey. This importance stems not only from the operational capability to map vast regions in minimum time, but also from the capability to differentiate the causes of variations in the earth's field. Rocket and space probe measurements supplement satellite surveys in providing cross-ties for mapping and in finding the sources of field variations. For most of the survey objectives, highly accurate measurements are required. Thus, magnetometers based on nuclear or atomic resonance offer many advantages. Vanguard III, (1959 eta), with a proton precessional magnetometer, was an initial step toward field mapping with an absolute instrument. Optical pumping magnetometers now make possible continuous absolute measurements over the full range of earth field intensities with low power dissipation. The Orbiting Geophysical Observatory satellites will probably be the primary vehicles for future magnetic field surveys. These include satellites in highly eccentric orbits with small inclination, and satellites in polar orbits of low eccentricity. (Author).
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Total Pages | : 10 |
Release | : 1996 |
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Empirical mode which estimate the magnetic field direction and magnitude at any point within the magnetosphere under a variety of conditions play an important role in space weather forecasting. We report here on a number of different studies aimed at quantitatively evaluating these models, and in particular the Tsyganenko T89a model. The models are evaluated in two basic ways: (1) by comparing the range of magnetic field tilt angles observed at geosynchronous orbit with the ranges predicted for the same locations by the models; and (2) by comparing the observed magnetic field mapping between the ionosphere and geosynchronous orbit (using two-satellite magnetic field conjunctions) with the model predictions at the same locations. We find that while the T89a model predicts reasonably well the basic variation in tilt angle with local time and permits a range of field inclinations adequate to encompass the majority of observed angles on the dawn, dusk, and night sides, it is unable to reproduce the range of inclinations on the dayside. The model also predicts a smaller magnetic latitude range of geosynchronous field line footpoints than the observed two-satellite mapping indicate. Together, these results suggest that the next generation of field models should allow a greater range of stretching, especially in local time sectors away from midnight. It is important to note, however, that any increased range should encompass less-stretched configurations: although there are certainly cases where the models are not sufficiently stretched, we find that on average all magnetic field models tested, including T89a, are too stretched. Finally, in investigating how well the observed degree of field stretch was ordered by various magnetospheric indices, we find that the tilt of the field at geosynchronous orbit is a promising candidate for the incorporation into future models.