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  • 1
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    A global magnetic anomaly map (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A subset of Pogo satellite magnetometer data has been formed that is suitable for analysis of crustal magnetic anomalies. Through the use of a thirteenth-order field model fit to these data, magnetic residuals have been calculated over the world to latitude limits of plus or minus 50 deg. These residuals, averaged over 1-degree latitude-longitude blocks, represent a detailed global magnetic anomaly map derived solely from satellite data. The occurrence of these anomalies on all individual satellite passes independent of local time and their decay as altitude increases imply a definite internal origin. Their wavelength structure and their correlation with known tectonic features further suggest that these anomalies are primarily of geologic origin and have their sources in the lithosphere.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Feb. 10
    Format: text
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  • 2
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    Direct measurements of natural tropospheric levels of OH via an aircraft borne tunable dye laser (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 3; June 197
    Format: text
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  • 3
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    The L = 6.6 Oosik barium plasma injection experiment and magnetic storm of March 7, 1972 (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A high-explosive shaped charge vaporizing a hollow conical liner of Ba metal and producing a fast field-aligned jet of plasma was detonated at high altitude, during a quiescent phase of a magnetic storm initiated by an ssc 10 hrs prior to the experiment, in an attempt to trace out and observe the dynamics of an auroral field line in the magnetosphere. Observations offer evidence for an upward Birkeland current sheet at the poleward edge of the auroral spiral of 8 x 10 to the minus second power A/m. Unusual features of the substorm leave open the possibility that the plasma injection may have triggered it.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; Mar. 1
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  • 4
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    Tectonic analysis of folds in the Colorado plateau of Arizona (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Structural mapping and analysis of folds in Phanerozoic rocks in northern Arizona, using LANDSAT-1 imagery, yielded information for a tectonic model useful in identifying regional fracture zones within the Colorado Plateau tectonic province. Since the monoclines within the province developed as a response to differential movements of basement blocks along high-angle faults, the monoclinal fold pattern records the position and trend of many elements of the regional fracture system. The Plateau is divided into a mosaic of complex, polyhedral crustal blocks whose steeply dipping faces correspond to major fracture zones. Zones of convergence and changes in the trend of the monoclinal traces reveal the corners of the blocks. Igneous (and salt) diapirs have been emplaced into many of the designated zones of crustal weakness. As loci of major fracturing, folding, and probably facies changes, the fractures exert control on the entrapment of oil and gas.
    Keywords: GEOPHYSICS
    Type: NASA-CR-145433 , OALS-BULL-9
    Format: application/pdf
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  • 5
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    The L equals 6.7 quiet time barium shaped charge injection experiment 'Chachalaca' (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Near dawn on October 9, 1972, UT, a barium plasma injection experiment was carried out from Poker Flat, Alaska, during quiet magnetic conditions (Kp equals 1+). The visible plasma flux tube produced was more diffuse than the flux tubes in previous experiments, but it could be tracked for 30 min out to an altitude of 2.5 earth radii. The flux tube remained integral for about 20 min, when a single striation separated from the main streak. Comparisons of the observed flux tube orientation with theoretical field models show no significant deviations ascribable to field-aligned currents. Cross-field drift rates of the foot of the flux tube indicate an E field of approximately 7 mV/m at 200-km altitude. Although an attempt was made via a jet aircraft flight, barium ions were not detected in the southern conjugate region. No energetic particle precipitation phenomena were observed which could be ascribed to the barium plasma injection.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 80; July 1
    Format: text
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  • 6
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    Two barium plasma injections into the northern magnetospheric cleft (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Two rocket experiments, performed in January 1975, investigated convection of plasma formed by solar photoionization of barium injected into the northern magnetospheric cleft at 13 km/s upward and parallel to the local geomagnetic field. Plasma convection was demonstrated from the cleft's poleward region, directly into and across the polar cap, and possibly into the convection system of the nightside auroral electrojet; plasma injected centrally within the cleft under quiet magnetic conditions remained in the cleft convection system for at least 22 min and revealed a highly structured E-field over about 600 km of longitudinal extent. Cleft location agreed with that predicted by ionosondes.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 2; July 197
    Format: text
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  • 7
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    Observed characteristics of auroral forms (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observed characteristics of discrete auroral arcs and pulsating aurora are described, and a mechanism for the discrete auroras is considered. Strong horizontal and vertical electric fields characterize the discrete auroras, since their motions and their distortions indicate the presence of shear processes involving substantial charge excesses and magnetic field-aligned currents. Pulsating auroras do not exhibit shearing behavior and this lack of shearing shows that substantial electric fields are not involved. Transitional types of auroras, including black aurora, are considered.
    Keywords: GEOPHYSICS
    Type: Space Science Reviews; 22; June 197
    Format: text
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  • 8
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    The Skylab barium plasma injection experiments. II - Evidence for a double layer (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Television observations of a barium-plasma flux tube extending from near 4500 km to near 10,000 km during a magnetic substorm and dawn-sector auroral display indicated several interesting anomalous events. Beyond 5500 km, there was a rapid increase in brightness accompanied by flux-tube splitting and diffusion, leaving behind a truncated single flux tube. From the orientation of the flux tube compared with theoretical field models, the presence of a substantial field-aligned current sheet is deduced. A suggested explanation of these phenomena is given in terms of a plasma potential double layer.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 81; Sept. 1
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  • 9
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    The Skylab barium plasma injection experiments. I - Convection observations (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Two barium-plasma injection experiments were carried out during magnetically active periods in conjunction with the Skylab 3 mission. The high-explosive shaped charges were launched near dawn on November 27 and December 4, 1973, UT. In both cases, the AE index was near 400 gammas, and extensive pulsating auroras covered the sky. The first experiment, Skylab Alpha, occurred in the waning phase of a 1000-gamma substorm, and the second, Skylab Beta, occurred in the expansive phase of an 800-gamma substorm. In both, the convection was generally magnetically eastward, with 100-km-level electric fields near 40 mV/m. However, in the Alpha experiment the observed orientation of the barium flux tube fit theoretical field lines having no parallel current, but the Beta flux-tube orientation indicated a substantial upward parallel sheet current.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 81; Sept. 1
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  • 10
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    Rocket measurements of electrons in a system of multiple auroral arcs (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A Nike-Tomahawk rocket was launched into a system of auroral arcs northward of Poker Flat Research Range, Fairbanks, Alaska. The pitch-angle distribution of electrons was measured at 2.5, 5, and 10 keV and also at 10 keV on a separating forward section of the payload. The auroral activity appeared to be the extension of substorm activity centered to the east. The rocket crossed a westward-propagating fold in the brightest band. The electron spectrum was relatively hard through most of the flight, showing a peak in the range from 2.5 to 10 keV in the weaker aurora and below 5 keV in the brightest arc. The detailed structure of the pitch-angle distribution suggested that, at times, a very selective process was accelerating some electrons in the magnetic field direction, so that a narrow field-aligned component appeared superimposed on a more isotropic distribution. It is concluded that this process could not be a near-ionosphere field-aligned potential drop, although the more isotropic component may have been produced by a parallel electric field extending several thousand kilometers along the field line above the ionosphere.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; Mar. 1
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