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  • Other Sources  (13)
  • 1
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    Intercomparison of various measurements of thermal plasma densities at and near the plasmapause (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Four methods of investigating the thermal plasma density near the plasmapause are intercompared for the period of July 1 to 15, 1972. These methods are whistlers, the double floating probe on Explorer 45, three IMP I plasma wave signatures, and observations made aboard both Prognoz 1 and Prognoz 2. Explorer 45 data have provided new information on the plasmapause bulge which, during this period, occurs at 16 L.T. This displacement from the accepted time of 18 L.T. or even later is substantiated by the Russian satellites. All methods give the result that the plasmapause is found at an electron number density somewhere between 20 and 120 per cu cm or, alternatively, at 60 per cu cm, to within a factor of 2.
    Keywords: GEOPHYSICS
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  • 2
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    Stimulus specificity and individual stereotypy of autonomic responses to motion stressors (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Motion sickness research shows a lack of agreement regarding the contribution of the autonomic nervous system (ANS). The resolution of this question is exigent for Space Adaptation Syndrome, zero gravity sickness. A case is drawn for the necessity to apply a methodological approach that incorporates: (1) standardization of parameters in relation to the individual differences in variability and prestimulus levels; (2) a concern for patterning of responses; and (3) the physiological association with subjective reports. Vasomotor, heart rate, respiration rate, skin conductance and subjective reports of malaise were collected from 22 subjects while participating in three motion stressors; vertical acceleration, Coriolis stimulation, and combined optokinetic and Coriolis stimulation. The results demonstrate that ANS response patterns can be separated into three mutually exclusive components: (1) a generalized response to motion sickness; (2) a stimulus specific response to the type of stressor being presented; and (3) individualized stereotypical response patterns that are associated with subjective reports of malaise.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-176543 , NAS 1.26:176543
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  • 3
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    Some features of pararesonance /PR/ whistlers (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Pararesonance (PR) whistlers observed in the topside ionosphere by the Dartmouth receiver on Ogo 6 are examined. The study extends that of Walter and Angerami (1969) to higher frequencies and shows that the upper cutoff frequency of PR whistlers closely follows a 1/L to the 4th dependence from 6 to 100 kHz (at L = 2.90 and 1.37, respectively). Most PR whistlers are attached to paralongitudinal (PL) whistlers due, presumably, to intermode coupling. The 'walking trace', or unattached PR whistler, reported by Walter and Angerami is evidently unusual. The upper cutoff frequency follows 1/L to the 4th whether attachment occurs or not. Rising sawtooth appendages starting at the upper cutoff frequency are frequency seen on PR whistlers.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 85; Jan. 1
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  • 4
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    An improved comparison of the LHR frequency observed by a VLF receiver and calculated from ion density measurements on the same spacecraft (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Radio Science; 12; Sept
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  • 5
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    Auroral hiss on the ground at L approximately equal to 4 (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Auroral hiss is rarely detected at subauroral-zone ground stations, but during the 4-month period January to April 1976 it became very prevalent in the wide-band audio-frequency synoptic whistler records at Farewell, Alaska (L = 4.2). A possible reason for this is that in the normal reduction and retreat of auroral zone effects to higher latitudes at sunspot minimum the reduction in the particle precipitation which causes auroral absorption is greater than that in the softer precipitation which causes auroral hiss. The occurrence of auroral hiss at Farewell showed, at 21 hours LMT (local magnetic time), the same strong diurnal peak found at auroral zone and polar cap stations. The low-frequency cutoff of auroral hiss on the ground is also discussed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; June 1
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  • 6
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    Wide-band observations of LF hiss at Frobisher Bay /L = 14.6/ (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Temporal and spectral characteristics of LF hiss recorded at Frobisher Bay from October 30 to November 18, 1972 and from June 27, 1974 to June 26, 1975 using a wide-band (0-100 kHz) receiver are reported and discussed. The hiss occurs in bursts of about 1 to 30 min duration with a bandwidth of at least 30 kHz centered in the 20-30 kHz range. Its frequency may extend downward below 10 kHz with decreasing intensity and upward to 100 kHz with increasing intensity. There is a strong diurnal peak of occurrence centered on 21 hours LMT. Some events simultaneously recorded by a 30-MHz rapid response riometer directly follow LF hiss bursts. Apparently some electron precipitation events produce hiss bursts only, others produce hiss and then a riometer event as the precipitation flux hardens, and others, too hard to produce hiss, produce riometer events only. An examination of the present data together with previous results (Jorgensen et al., 1962; Laaspere et al., 1976) leads to the conclusion that the precipitating electrons causing ground-observed LF hiss are more energetic and have smaller pitch angles than most auroral hiss observed in the topside atmosphere with an electric dipole antenna.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; June 1
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  • 7
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    Evidence of dayside plasmaspheric structure through comparisons of ground-based whistler data and Explorer 45 plasmapause data (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 81; Aug. 1
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  • 8
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    Simultaneous observation of whistlers at two L about 4 Alaskan stations (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Results are presented for simultaneous observations of whistlers at two Alaskan stations (L roughly 4) during one occasion lasting 24 hr, another lasting 10 hr, and a third lasting 6 hr. Of the three periods of simultaneous observations studied, two showed patterns of equatorial electron density which were stationary in L-LMT space and which were unchanging for at least 1.5 hr of UT. The third showed a marked change, the nature of which being accounted for by east-west gradients corotating with the stations. All three periods exhibited persistent stationary patterns of whistler duct tracks, each thin in the cross-L direction and extensive in the east-west direction. It would appear that either the ducts are stable shells or there is a succession of ducts arrayed along the contours and possibly corotating with the earth along the stationary tracks. Multistation direction finding on the whistler exit points may elucidate the relevant interpretations.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 81; Aug. 1
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  • 9
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    Light ion and electron troughs observed in the mid-latitude topside ionosphere on two passes of OGO 6 compared to coincident equatorial electron density deduced from whistlers (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 82; July 1
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  • 10
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    Cross-correlation and cross-spectral methods for drift velocity measurements. (1968)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Cross relation and cross spectral methods of computing drift velocity of structure undergoing internal rearrangement for remote solar wind observation
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; UGREVUE(
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