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  • Communications and Radar  (1)
  • SPACE RADIATION  (1)
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  • 1
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    Midlatitude electron precipitation: A possible source of contamination of galactic X and gamma-ray measurements (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The effect of trapped and precipitated particles in the magnetosphere on the measurement of galactic X-rays and gamma rays is discussed. To minimize contamination caused by electron precipitation, most galactic X-ray and gamma ray measurements are conducted at equatorial or relatively low to middle latitudes where the influence of auroral effects is expected to be small. Substorm-related VLF phase perturbations also affect the measurements. If such perturbation are indicative of electron precipitation at middle to low latitudes, then their relatively high frequency of occurrence, as many as 100 per year, is evidence that electron precipitation at these latitudes may pose a problem to some galactic X-ray and gamma ray measurements. Charts and maps are presented to show: (1) phase recordings from sixteen sub-ionospheric VLF propagation paths, (2) map of great circle propagation paths, (3) ionization rates in the nighttime ionosphere due to several sources, and (4) computer phase variation for the NLK-APL path versus electron flux for different e-folding energies.
    Keywords: SPACE RADIATION
    Type: NASA. Goddard Space Flight Center Proc. of the Workshop on Electron Contamination in X-ray Astronomy Expt.; 14 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A Versatile Planetary Radio Science Microreceiver (1999)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: We have developed a low-power. programmable radio "microreceiver" that combines the functionality of two science instruments: a Relative Ionospheric Opacity Meter (riometer) and a swept-frequency, VTF/HF radio spectrometer. The radio receiver, calibration noise source, data acquisition and processing, and command and control functions are all contained on a single circuit board. This design is suitable for miniaturizing as a complete flight instrument. Several of the subsystems were implemented in a field-programmable gate array (FPGA), including the receiver detector, the control logic, and the data acquisition and processing blocks. Considerable efforts were made to reduce the power consumption of the instrument, and eliminate or minimize RF noise and spurious emissions generated by the receiver's digital circuitry. A prototype instrument was deployed at McMurdo Station, Antarctica, and operated in parallel with a traditional riometer instrument for approximately three weeks. The attached paper (accepted for publication by Radio Science) describes in detail the microreceiver theory of operation, performance specifications and test results.
    Keywords: Communications and Radar
    Type: C96-01AR03
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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