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  • Other Sources  (9)
  • 1970-1974  (9)
  • 1930-1934
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  • 1
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    Sources of error in vacuum calibration of heat flux sensors (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Error sources in carbon black coating on thin foil heat flux sensors accounting for false altitude effects in vacuum calibration
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; BROTECHNIKA, NO. 3(
    Format: text
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  • 2
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    Survey of the seasonal snow cover of Alaska (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E72-10136 , NASA-CR-128190 , BMPR-1
    Format: application/pdf
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  • 3
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    Survey of the seasonal snow cover in Alaska (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. ERTS-1 data are used together with synoptic-climatological data to describe the buildup of the seasonal snow and ice covers in a north-south transect of a total length of about 1250 km across Alaska. It has been demonstrated that the ERTS-1 data may, under favorable conditions, be used for accurate mapping of snow lines in high mountain regions. The analysis shows that especially in the Brooks Range and on the Arctic Slope where snow covers generally are relatively thin, the ERTS-1 scenes can be useful for qualitative descriptions of the snow and ice covers over wide expanses. The onset and retreat of the seasonal snow cover are sensitive indicators of climatic fluctuations and the ERTS-1 data offers a possibility to record variations of the snow and ice buildup from year to year in a practical and informative way, which should be especially useful for studies of climatic trends. This is particularly true in Alaska where the density of the station network is too low to permit interpolations between the stations.
    Keywords: GEOPHYSICS
    Type: E73-10438 , NASA-CR-131232 , BMPR-4
    Format: application/pdf
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  • 4
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    Simultaneous measurements of the hydrogen airglow emissions of Lyman alpha, Lyman beta, and Balmer alpha. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Comparison of Lyman-alpha, 740- to 1050-A, and Balmer-alpha airglow measurements made at 134 deg solar-zenith angle on Oct. 13, 1969, with resonance-scattering models of solar radiation. Model comparison with Lyman-alpha data fixes the hydrogen column abundance over 215 km to 2 x 10 to the 13th per cu cm within a factor of 2. Differences between the Lyman-alpha model and data indicate a polar-equatorial departure from spherical symmetry in the hydrogen distribution. A Lyman-beta model based on the hydrogen distribution found to fit the Lyman-alpha data fits the spatial variation of the 740- to 1050-A data well from 100 to 130 km, but it does not fit the data well at higher altitudes; thus the presence of more rapidly absorbed shorter-wavelength radiation is indicated. This same resonance-scattering model yields Balmer-alpha intensities that result in good spatial agreement with the Balmer-alpha measurements, but a fivefold increase in the measured solar line center Lyman-beta flux is required (as required for the Lyman-beta measurement). The intensity ratio of Lyman-beta and Balmer-alpha at night is found to be a simple measure of the hydrogen optical depth if measurements with good accuracy can be made in the visible and ultraviolet spectrum.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 76; Nov. 1
    Format: text
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  • 5
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    Metrication study for large space telescope (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Various approaches which could be taken in developing a metric-system design for the Large Space Telescope, considering potential penalties on development cost and time, commonality with other satellite programs, and contribution to national goals for conversion to the metric system of units were investigated. Information on the problems, potential approaches, and impacts of metrication was collected from published reports on previous aerospace-industry metrication-impact studies and through numerous telephone interviews. The recommended approach to LST metrication formulated in this study cells for new components and subsystems to be designed in metric-module dimensions, but U.S. customary practice is allowed where U.S. metric standards and metric components are not available or would be unsuitable. Electrical/electronic-system design, which is presently largely metric, is considered exempt from futher metrication. An important guideline is that metric design and fabrication should in no way compromise the effectiveness of the LST equipment.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-124133
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  • 6
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    Survey of the seasonal snow cover of Alaska (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. The delineation of the transient snow cover can generally be made directly from any of the RBV of MSS images. On many glaciers, however, there seems to be a relatively small difference between the reflectivities of snow and ice in the visible portion of the spectrum (corresponding to MSS bands 4 and 5). On the other hand, the reflectivity is distinctly lower for ice than for snow in the near infrared (MSS bands 6 and 7). By applying the sensors of the latter spectral bands the position of the transient snowline, indicative of the mass balance, can in many cases be determined with what appears to be a satisfactory accuracy. This circumstance should prove especially useful in studies of regional variations of glacier mass balances. It had been found that the effect of winds early in the fall seasons can be seen on the arctic slope when a light dusting of snow is present. Winds channeled by topography redistribute the snow and actually remove it from regions. After freeze up has occurred and a continuous snow cover exists it is possible to identify open water reaches on streams flowing through the region. Such cases are identifiable on the ERTS images especially on the MSS 7 images.
    Keywords: GEOPHYSICS
    Type: E72-10344 , NASA-CR-129658 , BMPR-2
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  • 7
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    Survey of the seasonal snow cover in Alaska (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E73-11086 , NASA-CR-135554 , BMPR-7
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  • 8
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    Survey of the seasonal snow cover in Alaska (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E73-10637 , NASA-CR-132096 , BMPR-5
    Format: application/pdf
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  • 9
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    Survey of the seasonal snow cover in Alaska (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. The object of this project is to describe freeze-up and breakup patterns of seasonal snow and ice covers in Alaska. During the reporting period, concentration has been on: (1) collection of ground-based data at various places in the north-south transect across Alaska; (2) using the ERTS-1 data together with observations from air and ground to describe the snow cover characteristics on the Arctic Slop during Winter and during the breakup period. Analysis has shown that the ERTS-1 data provides information on break-up pattern including development of runoff over extensive watersheds, areas of low albedo and early snows retreat before the start of the main ablation period, and the extent of large snow drifts and aufeis and aufeis remains after the main ablation period. The ERTS-1 data can also be used to monitor manmade effects on the breakup in the Prudhoe Bay oil exploration area.
    Keywords: GEOPHYSICS
    Type: E73-10920 , NASA-CR-133577 , SATR-2
    Format: application/pdf
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