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  • 1
    Publication Date: 2013-08-31
    Description: The design of the vector magnetometer selected for analysis is capable of exceeding the required accuracy of 5 gamma per vector field component. The principal elements that assure this performance level are very low power dissipation triaxial feedback coils surrounding ring core flux-gates and temperature control of the critical components of two-loop feedback electronics. An analysis of the calibration problem points to the need for improved test facilities.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-144825
    Format: application/pdf
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  • 2
    Publication Date: 2011-08-17
    Description: The intensity and profile of the helium resonance line at 584 A from the entire disk of the sun was investigated by using a rocket-borne helium-filled spectrometer and a curve-of-growth technique. The line profile was found to be accurately represented by a Gaussian profile with full width at half maximum of 122 + or - 10 mA, while the integrated intensity was measured to be 2.6 + or - 1.3 billion photons/s per sq cm at solar activity levels of F(10.7) = 90.8 x 10 to the -22nd per sq m/Hz and Rz = 27. The measured line width is in good agreement with previous spectrographic measurements, but the integrated intensity is larger than most previous photoelectric measurements. However, the derived line center flux of 20 + or - 10 billion photons/s per sq cm/A is in good agreement with values inferred from airglow measurements.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research; 83; Dec. 1
    Format: text
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  • 3
    Publication Date: 2019-07-13
    Description: The Pioneer 10 and 11 Jupiter probes have provided several opportunities for observation of the Jovian satellites J I through J V. From these data, a tenuous atmosphere of hydrogen for Io has been identified. In the present work, an additional short-wavelength (less than 800 A) emission associated with an extended cloud centered on Io is reported and interpreted as arising from the radiative decay of excited atomic ions. Characteristic X-rays produced by electron bombardment of Io's surface may also contribute to the signal. Emission features associated with Amalthea (J V) and Europa (J II) are also observed. Signals apparently associated with J V occur in the long-wavelength channel, while emissions were observed in the short-wavelength channel during J II observations. The data of the long-wavelength channel are interpreted as arising from atomic hydrogen Lyman-alpha emission in all cases. The source species for the short-wavelength emissions cannot at this time be unambiguously determined, but the wavelength range of the signals is well established.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Colloquium on Jupiter: Studies of the interior, atmosphere, magnetosphere and satellites; May 19-21, 1975; Tucson, AZ
    Format: text
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  • 4
    Publication Date: 2019-07-13
    Description: Prelaunch and postlaunch calibration results for the Meteor 3/total ozone mapping spectrometer (TOMS) instrument are presented here. Ozone amounts are retrieved from measurements of Earth albedo in the 312- to 380-nm range. The accuracy of albedo measurements is primarily tied to knowledge of the reflective properties of diffusers used in the calibrations and to the instrument's wavelength selection. These and other important prelaunch calibrations are presented. Their estimated accuracies are within the bounds necessary to determine column ozone to better than 1%. However, postlaunch validation results indicate some prelaunch calibration uncertainties may be larger than originally estimated. Instrument calibrations have been maintained postlaunch to within a corresponding 1% error in retrieved ozone. Onboard calibrations, including wavelength monitoring and a three-diffuser solar measurement system, are described and specific results are presented. Other issues, such as the effects of orbital precession on calibration and recent chopper wheel malfunctions, are also discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 100; D2; p. 2985-2995
    Format: text
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  • 5
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The theory of ferrohydrodynamics describes the specific physical properties associated with a magnetizable fluid. From this theory a constitutive equation was derived, which characterizes the stray-field-induced formation of ferrofluid Bitter patterns on the surface of a ferromagnetic specimen.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-0972
    Keywords: Anaerobic ; bamboo ; support material ; wastewater treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The changes in 2.5-cm thick bamboo rings during their use as a support material in an anaerobic reactor show that the wash out and degradation processes are largely completed within 6 months to a year. The dry mass of the bamboo used decreased more quickly in the first half of the year than during the second half and asymptotically approached a loss limit of approximately 15% (w/w). The decrease in substances contained in the bamboo during the 2-year experimental period led to reductions in wall thickness of the rings of 0.8 mm and in the absorbable pressure of 21%. Bamboo thus appears to be suitable for long-term use in an anaerobic reactor.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2578-2580 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a capacitively controlled force microscope we have imaged typical domain wall configurations like 90° closure structures and subdivided 180° wall segments in single-crystal iron whiskers. Differences in wall contrast between 90° and 180° domain walls are clearly observed. The effect of tip-to-sample distance on lateral resolution and wall contrast in magnetic force microscopy is shown.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2513-2515 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic-field sensors of bulk La0.67Sr0.33MnO3 and La0.67Ba0.33MnO3 were fabricated. The investigations show that a large low-field magnetoresistance (MR) is exhibited by the polycrystalline samples. MR ratios of the sensors as large as 20% at 77 K and 1.5% at 298 K were observed in fields of 700 Oe. Corresponding field sensitivities as high as 170%/T at 3 mT and 298 K, and 700%–960%/T at 3–8 mT and 77 K were obtained. The low-field MR is associated with intergranular transport of spin-polarized electrons. It is found to be highly anisotropic. The phenomenon is discussed in terms of spin-polarized transport through two kinds of grain boundaries. These represent two extremes of grain-boundary environments. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1839-1841 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electron holography is applied to the investigation of the leakage magnetic field produced by sharp ferromagnetic probes employed for magnetic force microscopy. Using the double exposure technique, interference fringes were obtained which show a good qualitative agreement with calculations based on a macroscopic dipole model for the sensor tips. Magnetic flux measurements are possible through the evaluation of the phase difference in the simulated map of the dipole field.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 2351-2353 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a low-temperature scanning tunneling microscope spatial variations of the current-voltage characteristics have been investigated on NbSe2 single crystals employing PtIr and ferromagnetic Ni tips. At 4.2 K a clear superconducting energy gap is visible even when tunneling through the Ni tip. After field-induced transfer of the sample into the superconducting mixed state a complete Abrikosov flux lattice is imaged for both types of probes by recording the tunneling current at a fixed voltage within the superconducting gap. Comparison of the images obtained by the two probe materials clearly shows that no distortion of the flux lattice is produced by magnetostatic interactions between the ferromagnetic tip and the individual vortices. This provides the basis for future investigations of flux distributions in superconductors by magnetic force microscopy.
    Type of Medium: Electronic Resource
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