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  • 1
    Publication Date: 2019-05-30
    Description: Subsidiary peaks in power spectra of Ci and Kp /magnetic indices/ attributed to amplitude modulation of 27-day components
    Keywords: GEOPHYSICS
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  • 2
    Publication Date: 2014-09-09
    Description: As the California State Water Project progresses and enters operation, it is suggested that changes in land use which may be monitored and anlayzed by remote sensing techniques will follow suite. Progress in each of these areas of research and automated mapping techniques to monitor these changes is presented for two specific regions: (1) the Perris Valley surrounding the future Lake Perris; and (2) the Sheep Creek Fan-Mirage Basin area of the Mojave Desert.
    Keywords: GEOPHYSICS
    Type: An Integrated Study of Earth Resources in the State of Calif. Using Remote Sensing Tech.; 35 p
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  • 3
    Publication Date: 2014-09-25
    Description: Since 1951, the U.S. Navy, under its Project MAGNET program, has been continuously collecting vector aeromagnetic survey data to support the U.S. Defense Mapping Agency's world magnetic and charting program. During this forty-year period, a variety of survey platforms and instrumentation configurations have been used. The current Project MAGNET survey platform is a Navy Orion RP-3D aircraft which has been specially modified and specially equipped with a redundant suite of navigational positioning, attitude, and magnetic sensors. A review of the survey data collection procedures and calibration and editing techniques applied to the data generated by this suite of instrumentation will be presented. Among the topics covered will be the determination of its parameters from the low-level calibration maneuvers flown over geomagnetic observatories.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center, Types and Characteristics of Data for Geomagnetic Field Modeling; p 215-248
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  • 4
    Publication Date: 2018-12-01
    Description: Correction of magnetic measurements made by Mariner II, noting use of second-order approximation for interplanetary magnetic field
    Keywords: GEOPHYSICS
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  • 5
    Publication Date: 2019-06-28
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 23; Oct. 198
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  • 6
    Publication Date: 2019-06-28
    Description: The spectra for the field are presented together with power spectra of the natural magnetospheric and ionosheric noise and a power spectrum of instrumental noise for a typical fluxgate magnetometer. The source of these data is described. The implications of these data relative to desirable instrument frequency resonse, stability and resolution specification as well as the implications relative to desirable spacecraft position and orientation accuracy specifications and desirable environmental (temperature, magnetic noise) specifications are discussed. Implications of these power spectra relative to choice of a suitable magnetometer and relative to desirable methods of data processing are considered. Finally, implications for desirable orbit and mission duration are discussed.
    Keywords: GEOPHYSICS
    Type: PUBL-1810 , Alabama Univ. UAH/NASA Workshop on the Use of a Tethered Satellite System 5-32 (SEE N81-29479 20-42)
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  • 7
    Publication Date: 2019-06-27
    Description: Equations providing numerical values of the geomagnetic field spherical harmonic spatial power spectrum as defined by Lowes (1966, 1974) are obtained and this power spectrum is related to various other power spectra. Equations relating the spherical harmonic spatial power spectrum to average great circle power spectra for components of the vector magnetic field in the radial direction, along the great circle track and perpendicular to the first two directions are derived under the assumption that the sources of the field are internal. A statistical model for the crustal and core geomagnetic fields is proposed and used to derive equations for the expected main and crustal spherical harmonic power spectra. The model equations are then compared with observations to determine a scale factor which is then used to obtain an estimate for the core radius and a great circle power spectrum for the field component perpendicular to the great circle and radial directions which are in good agreement with observations. The predicted spherical harmonic power spectrum for the crustal field is found to be consistent with POGO satellite and aircraft data. Other possible models for the crustal and core geomagnetic fields are also briefly considered.
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 23; Aug. 198
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  • 8
    Publication Date: 2019-06-27
    Description: The structure of the north-south field component in the interaction regions of the interplanetary magnetic field is studied. Emphasis is placed on a computer program developed to locate interaction regions by testing for the enhancement in field magnitude known to be characteristic of these regions.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 85; June 1
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  • 9
    Publication Date: 2019-06-27
    Description: The use of satellite data from the ERTS-1 satellite for mapping the cotton acreage in the southern deserts of California is discussed. The differences between a growing, a defoliated, and a plowed down field can be identified using an optical color combiner. The specific application of the land use maps is to control the spread of the pink bollworms by establishing planting and plowdown dates.
    Keywords: GEOPHYSICS
    Type: PAPER-A15 , NASA. Goddard Space Flight Center Symp. on Significant Results obtained from the ERTS-1, Vol. 1, Sect. A and B; p 127-133
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  • 10
    Publication Date: 2019-06-27
    Description: The detection of a newly introduced crop into the Imperial (California) Valley by sequential ERTS-1 imagery is proving that individual crop types can be identified by remote sensing techniques. Initial results have provided an extremely useful product for water agencies. A system for the identification of field conditions enables the production of a statistical summary within two to three days of receipt of the ERTS-1 imagery. The summary indicates the total acreage of producing crops and irrigated planted crops currently demanding water and further indicates freshly plowed fields that will be demanding water in the near future. Relating the field conditions to the crop calendar of the region by means of computer techniques will provide specific crop identification for the 8000 plus fields.
    Keywords: GEOPHYSICS
    Type: PAPER-A2 , NASA. Goddard Space Flight Center Symp. on Significant Results obtained from the ERTS-1, Vol. 1, Sect. A and B; p 19-25
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