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  • Other Sources  (19)
  • GEOPHYSICS  (18)
  • COMPUTER OPERATIONS AND HARDWARE  (1)
  • 2000-2004
  • 1995-1999
  • 1970-1974  (19)
  • 1935-1939
  • 1974  (19)
  • 1
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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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    NASA TECHNICAL REPORTS
  • 2
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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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    NASA TECHNICAL REPORTS
  • 3
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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
  • 4
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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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    NASA TECHNICAL REPORTS
  • 5
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    An automated and repeatable data analysis procedure for remote sensing applications (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new multispectral data analysis procedure, based on LARSYS, has been developed which substantially reduces the influence of the analyst. The analysis is automated, including the interpretation of clustering results. The classification results obtained are repeatable and not biased by analyst subjectivity during the analysis.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: International Symposium on Remote Sensing of Environment; Apr 15, 1974 - Apr 19, 1974; Ann Arbor, MI
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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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
  • 7
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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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    NASA TECHNICAL REPORTS
  • 8
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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: E74-10639 , NASA-CR-138813 , PR-14
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Television observations of artificial aurora and analyses of flight data from NASA payload 12.18 NE (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An accelerator nominally capable of ejecting pulses of electrons up to 6 sec in length, current to 500 ma and energy to 20 keV was flown on a rocket at 1500 October 15, 1972. The Strypi rocket was launched from the Pacific Missile Range Facility at Kauai, Hawaii. The intent was to eject electron pulses of various characteristics upwards along the magnetic field so as to produce artificial auroras in the conjugate (Southern Hemisphere) atmosphere and possibly to produce weaker auroras in the nearby atmosphere as a consequence of backscattered electrons. The accelerator package included a gas jet actuated attitude control system controlled by gyros. Attitude sensing also was accomplished by a two-axis fluxgate magnetometer, and a large foil was deployed to collect ambient electrons to neutralize the accelerator when it ejected high-energy electrons. Scientific instrumentation contained on the flight package included retarding potential analyzers, energetic electron detectors, and detectors to sense very low frequency radio noise. Image orthicon television systems and other optical sensors were operated in the conjugate region aboard two NC-135 jet aircrafts based in Samoa. Similar devices were operated at Haleakala, Hawaii, to attempt detection of auroras caused by backscattered electrons.
    Keywords: GEOPHYSICS
    Type: NASA-CR-140379
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Low-altitude acceleration of auroral electrons during breakup observed by a mother-daughter rocket (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: By the use of a mother-daughter rocket combination and ground-based observations with television, time and space variations are resolved in particle measurements in breakup aurora. The spectral variations measured during a temporal variation in the aurora can be explained by a nearly uniform acceleration of all the electrons such as would be caused by an electric potential drop along the magnetic field lines. Many other explanations can be eliminated.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 79; Apr. 1
    Format: text
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    NASA TECHNICAL REPORTS
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