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  • 1
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    Geomagnetism and the ionosphere (1964)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Theoretical interpretations of geomagnetic and ionospheric satellite measurements
    Keywords: GEOPHYSICS
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  • 2
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    Spherical harmonic analyses for the spheroidal earth. (1964)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Modifying spherical harmonic analysis of surface geomagnetic field to account for Earth oblateness by two methods
    Keywords: GEOPHYSICS
    Type: JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY
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  • 3
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    Spherical harmonic analyses for the spheroidal earth, ii (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-24
    Description: Spherical harmonic analysis of earth magnetic field
    Keywords: GEOPHYSICS
    Type: NASA-CR-67399 , RM-4750-NASA
    Format: application/pdf
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  • 4
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    Measured electric field in the vicinity of a thunderstorm system at an altitude of 37 km (1974)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A balloon-borne experiment to measure the atmospheric electric field was flown from the National Scientific Balloon Facility at Palestine, Texas, on July 10, 1973. The electric field and atmospheric conductivity were measured during ascent and for a 4-hour float period at 37-km altitude. Termination of the flight occurred near a thunderstorm line in west Texas. The perturbing influence of the thunderstorms on the electric field was observed at least 100 km from the storm line. The measured electric field is in reasonable agreement with calculations based on simple models of cloud structure and atmospheric conductivity. Large pulses in the measured electric field are interpreted as being the result of intracloud lightning.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 79; Dec. 1
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  • 5
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    Atmospheric helium and geomagnetic field reversals. (1972)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The problem of the earth's helium budget is examined in the light of recent work on the interaction of the solar wind with nonmagnetic planets. It is proposed that the dominant mode of helium (He4) loss is ion pumping by the solar wind during geomagnetic field reversals, when the earth's magnetic field is very small. The interaction of the solar wind with the earth's upper atmosphere during such a period is found to involve the formation of a bow shock. The penetration altitude of the shock-heated solar plasma is calculated to be about 700 km, and ionization rates above this level are estimated for a cascade ionization (electron avalanche) process to average 10 to the 9th power ions/sq cm/sec. The calculated ionization rates and the capacity of the solar wind to remove ionized helium (He4) from the upper atmosphere during geomagnetic dipole reversals are sufficient to yield a secular equilibrium over geologic time scales. The upward transport of helium from the lower atmosphere under these conditions is found to be adequate to sustain the proposed loss rate.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 77; Nov. 1
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  • 6
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    X-rays from an auroral substorm at altitudes of 60-80 km and 15-20 km (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A technique for the measurement of high altitude X-rays associated with auroral events is described. The instrument package is boosted to the lower D region by a rocket and descends slowly by parachute. This arrangement facilitates coordination with the launching of other rocket probes during events of interest. A flight on Feb. 2, 1973 from the Churchill Research Range provided 17 minutes of X-ray data above 28 km. The flight was made into an intense break-up event and X-ray fluxes were observed during two episodes of the explosive phase. The reduction of auroral absorption during the later phases of the event suggests precipitation of energetic electrons unaccompanied by the lower energy precipitation responsible for the absorption earlier in the substorm.
    Keywords: GEOPHYSICS
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