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  • Other Sources  (24)
  • GEOPHYSICS  (23)
  • Chemical Engineering
  • LUNAR AND PLANETARY EXPLORATION
  • 2005-2009
  • 1990-1994
  • 1970-1974  (24)
  • 1974  (18)
  • 1972  (6)
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Source
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Years
  • 2005-2009
  • 1990-1994
  • 1970-1974  (24)
Year
  • 1
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    Two successful geomagnetic-field-line tracing experiments. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Two field-line tracing experiments were conducted on an L = 1.26 magnetic flux tube over Kauai, Hawaii. Barium vapor was created by the detonation of a highly explosive shaped charge aligned with the geomagnetic field at a 467-km altitude. Barium ions traveled along the field line to the conjugate ionosphere in a tube 3 to 5 km in diameter, producing a visible streak along the entire 6900-km path length. Electric fields perpendicular to the magnetic field caused the ions to drift away from the true conjugate during transit, but extrapolation from subsequent ion drift rates allowed the conjugate to be identified and compared with several field models. Differing ion drift rates and directions at the conjugate points indicated that the electric field is not transferred unattenuated along field lines.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 77; June 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Observations of fast auroral waves. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Results of simultaneous observation of a fast wave event from the Ester Dome Observatory (EDO) near College, Alaska, the Poker Flat Rocket Launching Facility (PKR), and Fort Yukon, Alaska (FYU). The display occurred on Mar. 27, 1971, and the general morphology is described and discussed. It is suggested that fast auroral waves occur when a preceding substorm has enhanced the particle population in the region of the magnetosphere near L = 6 in the midnight sector; then transverse hydromagnetic waves, associated with the onset of further local substorm activity, become visible through their action on this enhanced particle population as they propagate inwards in the equatorial region.
    Keywords: GEOPHYSICS
    Type: Planetary and Space Science; 20; Mar. 197
    Format: text
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  • 3
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    Study of a small magnetospheric substorm (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Data from a rocket launched into the expansion phase of an auroral substorm have been compared with data from numerous ground stations and several space vehicles. It is shown that this magnetic and auroral substorm has most of the features of larger substorms; thus it is implied that the same plasma processes are involved in all substorms. Some evidence is presented to link the auroral breakup with the field lines conjugate to the inner edge of the plasma sheet. The implications of these two results for substorm morphology and the triggering mechanism of the substorm instability are discussed. It is concluded that spatial gradients in plasma temperature are a likely cause.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 79; Apr. 1
    Format: text
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  • 4
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    Tracking air-dropped drogues and dyes from aircraft in support of ERTS-1 circulation studies (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. For two years ERTS-1 has been employed to investigate current circulation patterns in Delaware Bay under different tidal, flow, and wind conditions. Since sufficient numbers of current meters and boats are not available, air-droppable drogues and dye packs have been developed and tested. The drogues consist of a styrofoam float and a line to which is attached a stainless steel biplane. The length of the line determines at what depth currents will be monitored. The floats are color coded to distinguish their movement and mark the depth of the biplanes. Simultaneously floating and anchored dye packs of fluorescein dye have been deployed from aircraft. The movement of the dye and drogues is tracked by sequential aerial photography, using fixed markers on shore or on buoys as reference points to calibrate the scale and direction of drogue movement. The current data obtained by this technique is then used to annotate current circulation maps derived from ERTS-1 imagery.
    Keywords: GEOPHYSICS
    Type: E74-10747 , NASA-CR-139987
    Format: application/pdf
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  • 5
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    Edge and line detection in ERTS imagery: A comparative study (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Several local edge detection operators were applied to a set of ERTS pictures of the Monterey, Calif. area. Gradient operators performed consistently better than laplacian operators in detecting edges. It was also found that if a grayscale normalization operation, histogram flattening, was applied to the pictures first, the edge detector outputs were greatly enhanced. The use of interpolation for more accurate location of edges on a digital picture was also briefly investigated. Curve detection operators were applied to the edge detector outputs; this had the effect of enhancing the edges while suppressing noise.
    Keywords: GEOPHYSICS
    Type: NASA-CR-138963 , TR-312
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Effects of atmospheric aerosols on scattering reflected visible light from earth resource features (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The vertical variations in atmospheric light attenuation under ambient conditions were identified, and a method through which aerial photographs of earth features might be corrected to yield quantitative information about the actual features was provided. A theoretical equation was developed based on the Bouguer-Lambert extinction law and basic photographic theory.
    Keywords: GEOPHYSICS
    Type: NASA-CR-139382
    Format: application/pdf
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  • 7
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    Ground pattern analysis in the Great Plains (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. During preliminary analysis of the ERTS-1 RBV band-2 images it was possible to detect many geologic features and to delineate several geologic formation boundaries. Also, the spatial frequency characteristics of some different geologic formations are distinguishable from each other. At the present time there is not enough data to provide any statistical evaluation of these differences, but it is hoped that more quantitative results will be produced within the next few months. Multispectral analysis will begin when the retrospective order for the other spectral bands of the first images is received. Since many geologic formation boundaries are visible on the single band that has been analyzed so far, even greater visibility is expected with the spectral information available in the additional bands.
    Keywords: GEOPHYSICS
    Type: E72-10122 , NASA-CR-128176
    Format: application/pdf
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  • 8
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    A global magnetic anomaly map (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A subset of POGO satellite magnetometer data has been formed that is suitable for analysis of crustal magnetic anomalies. Using a thirteenth order field model, fit to these data, magnetic residuals have been calculated over the world to latitude limits of plus 50 deg. These residuals averaged over one degree latitude-longitude blocks represent a detailed global magnetic anomaly map derived solely from satellite data. Preliminary analysis of the map indicates that the anomalies are real and of geological origin.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-70628 , X-922-74-98 , NSSDC-ID-65-081A-05-PS , NSSDC-ID-67-073A-06-PS , NSSDC-ID-69-051A-21-PS
    Format: application/pdf
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  • 9
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    A study of the early detection of insect infestations and density/distribution of host plants (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10600 , NASA-CR-138709 , PR-12
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    A study of early detection of insect infestations and density/distribution of host plants (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10638 , NASA-CR-138812 , PR-13
    Format: application/pdf
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