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  • NASA Technical Reports  (2)
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  • 1
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    A Comparison of Solar p-Mode Parameters from MDI and Gong: Mode Frequencies and Structure Inversions (2003)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Helioseismic analysis of solar global oscillations allows investigation of the internal structure of the Sun. One important test of the reliability of the inferences from helioseismology is that the results from independent sets of contemporaneous data are consistent with one another. Here we compare mode frequencies from the Global Oscillation Network Group and Michelson Doppler Imager on board SOHO and resulting inversion results on the Sun's internal structure. The average relative differences between the data sets are typically less than 1 x 10(exp -5) substantially smaller than the formal errors in the differences; however, in some cases the frequency differences show a systematic behavior that might nonetheless influence the inversion results. We find that the differences in frequencies are not a result of instrumental effects but are almost entirely related to the data pipeline software. Inversion of the frequencies shows that their differences do not result in any significant effects on the resulting inferences on solar structure. We have also experimented with fitting asymmetric profiles to the oscillation power spectra and find that, compared with the symmetric fits, this causes no significant change in the inversion results.
    Keywords: Solar Physics
    Type: The Astrophysical Journal; 591; 432-445
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Plasma structuring by the gradient drift instability at high latitudes and comparison with velocity shear driven processes (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Using results of the in situ measurements made by the DE 2 satellite, the nature of plasma structuring at high latitudes, caused by the gradient drift instability process, is described. Using noon-midnight and dawn-dusk orbits of the DE 2 satellite, it was possible to examine the simultaneous density and electric field spectra of convecting large-scale plasma density enhancements in the polar cap known as 'patches', in directions parallel and perpendicular to their antisunward convection. The results provide evidence for the existence of at least two generic classes of instabilities operating in the high-latitude ionosphere: one driven by large-scale density gradients in a homogeneous convection field with respect to the neutrals, and the other driven by the structured convection field itself in an ambient ionosphere where density fluctuations are ubiquitous.
    Keywords: GEOPHYSICS
    Type: AD-A227847 , Journal of Geophysical Research (ISSN 0148-0227); 95; 7799-781
    Format: text
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    NASA TECHNICAL REPORTS
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