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  • 1
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    Assessment of the Impact of the California Water Project in Southern California (1971)
    In:  CASI
    Details
    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
    Format: text
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  • 2
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    Evaluation of remote sensing in control of pink bollworm in cotton (1973)
    In:  CASI
    Details
    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
    Format: application/pdf
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  • 3
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    Semi-automatic crop inventory from sequential ERTS-1 imagery (1973)
    In:  CASI
    Details
    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
    Format: application/pdf
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  • 4
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    Storm-associated Pc 5 micropulsation events observed at the synchronous equatorial orbit. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Quasi-sinusoidal magnetic-field (micropulsations) are regularly observed at ATS 1 during geomagnetic storms. The wave events typically occur during the main phase and tend to be confined to the afternoon sector. All observed events have been closely correlated with magnetospheric substorm activity. Power spectral analysis shows that the observed oscillations are composed of harmonically related components. Twenty-six wave events were observed in 1967; the analysis of three typical Pc 5 events is presented here. The observations are compared with the predictions of theory for a hot inhomogeneous plasma. It is suggested that the observed micropulsations can be understood as the occurrence of either an Alfven wave instability, or a drift instability, of the enhanced storm-time ring current.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 77; Jan. 1
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  • 5
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    Frequency dependence of ATS-1 observed micropulsations of some geophysical parameters (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Low frequency oscillations in the earth's magnetic field at the synchronous orbit were observed with the magnetometer experiment on board the ATS 1 satellite since Dec. 1966. An analysis of oscillations in the range .002 f .02 H3 for the interval Dec. 1966 through Dec. 1968 is reported. It was found that the frequency of an event increases with the sum of Kp for 24 hours prior to the event midpoint. For events with duration greater than 6 hours, the product moment correlation coefficient for frequency f, and the sum Kp was R = 0.87. The best least squares linear fit to the data for these events was f = (0.32) sum Kp = 5.1. For the same events the correlation coefficient for frequency and Dst was R = -0.83.
    Keywords: GEOPHYSICS
    Type: NASA-CR-127040
    Format: application/pdf
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  • 6
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    Fluctuating magnetic fields in the magnetosphere. II - ULF waves. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: At the present time the existing satellite observations of ULF waves suggest that the level of geomagnetic activity controls the types of waves which occur within the magnetosphere. Consequently, we consider separately quiet times, times of magnetospheric substorms, and times of magnetic storms. Within each of these categories, there are distinctly different wave modes distinguished by their polarization: either transverse or parallel to the ambient field. In addition, these wave phenomena occur in distinct frequency bands. In terms of the standard nomenclature of ground micropulsation studies ULF wave types observed in the magnetosphere include quiet time transverse - Pc 1, Pc 3, Pc 4, Pc 5; quiet time compressional - Pc 1 and Pi 1; substorm compressional Pi 1 and Pi 2; storm transverse - Pc 1; storm compressional Pc 4, 5.
    Keywords: GEOPHYSICS
    Type: NSSDC-ID-66-049A-11-OS , NSSDC-ID-68-014A-14-PS , NSSDC-ID-68-014A-15-OS , Space Science Reviews; 13; July 197
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  • 7
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    Some characteristics of low-frequency oscillations observed at ATS 1. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Analysis of low-frequency oscillations of the magnetic field at ATS 1 for the 25-month data interval from December 1966 to December 1968. Irregular oscillations and oscillations associated with magnetic storms were excluded from the analysis. Of the 222 events identified, 170 events were oscillating predominantly transverse to the background magnetic field. The oscillations were observed to occur most frequently in the early afternoon hours. They also seemed to occur more frequently during December, January, and February than at other times of the year. During a given individual event the frequency was fairly constant and it varied between .0015 and .02 Hz with a broad peak near .01 Hz. The event duration varied between a minimum of 10 min and a maximum of 14 hours and 26 min. During a given event the amplitude varied. The average maximum amplitude of an event was about 3 gamma.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 77; Feb. 1
    Format: text
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  • 8
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    Micropulsations in the morning sector. I - Ground observations of 10- to 45-second waves Tungsten, Northwest Territories, Canada (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 78; Dec. 1
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  • 9
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    Substorms in space - The correlation between ground and satellite observations of the magnetic field (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Several of the events criticized by Akasofu (1972) are reexamined. It is concluded that there is no simple one-to-one relationship between polar magnetic substorms and magnetospheric substorms as defined by midlatitude magnetograms. It appears that in some cases polar magnetic substorms occur during the growth phase of a magnetospheric substorm. Magnetospheric observations are more systematically organized by midlatitude onsets than by auroral zone onsets. The determination of onset times is discussed together with the determination of substorm similarity, the phenomenological model of magnetic variations during magnetospheric substorms, the event of February 25, 1967, and the complex event of February 13, 1968.
    Keywords: GEOPHYSICS
    Format: text
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  • 10
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    Stormtime disturbance fields at ATS 1 (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Geomagnetic storm disturbance fields measurement by ATS 1 satellite compared with simultaneous low altitude observation, noting cavity sudden commencement compression effect
    Keywords: GEOPHYSICS
    Type: ; YAL SOCIETY (
    Format: text
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