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  • 1
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    Solar wind speed azimuthal variation along the heliospheric current sheet (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Analysis of the speeds measured by Voyager 1 and 2 while skimming along a horizontal (east-west) portion of the current sheet over several days in 1977 is reported. The results demonstrate that in this case speed variations exist and would be large enough to significantly deform the sheet within a few AU or less if the current sheet were anything but perfectly horizontal. The spatial scale of the speed variation ranges from the smallest measureable scale using one hour averaged data up to tens of degrees in longitude. A deformation example is given under the assumption that the observed velocity variation exists on a current sheet that is initially perpendicular to the heliographic equator.
    Keywords: SOLAR PHYSICS
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  • 2
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    Observations of low-degree P-mode oscillations in 1984 (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Analysis of Stanford differential velocity observations has been extended through the 1984 observing season. Excellent quality observations were obtained in 1984 on 38 days in a 49 day interval from June 20th through August 7th. The power spectrum of this data has been examined and improved frequency determinations have been made for p-modes of degree 2 through 5 and order 5 through 34. Of special interest are the modes of the lower orders, n ranging from 5 to 10, which have not been identified previously.
    Keywords: SOLAR PHYSICS
    Type: Contributions to Proceedings from the NATO Advanced Research Workshop on the Seismology of the Sun and the Distant Stars; p 11-18
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  • 3
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    The detection of global convective wave flows on the Sun (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Global convective flows in the solar convection zone have been predicted by theoretical interpretations of the global-scale ordering of magnetic fields and activity centers and by theoretical analyses of rotating convection zones. Direct evidence of these flows in the photosphere has not previously been found despite several long-term efforts. The signatures of such flows have now been detected by analyzing the daily series of low-resolution Dopplergrams obtained at the Wilcox Solar Observatory at Stanford University. The signatures are patterns of alternating east and west flows with amplitudes on the order of 25 m/s and longitudinal extent of about 30 degrees. The patterns move across the disc at approximately the solar rotation rate and have lifetimes of at least several rotations. Boundaries of the fast and slow flows are often associated with large magnetic active regions.
    Keywords: SOLAR PHYSICS
    Type: Contributions to Proceedings from the NATO Advanced Research Workshop on the Seismology of the Sun and the Distant Stars; p 1-10
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  • 4
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    Seasonal variation and magnitude of the solar sector structure-atmospheric vorticity effect (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Evidence is reported for a seasonal variation in the effect of solar sector structure on terrestrial atmospheric vorticity. Graphs showing average response of the 50,000-Pa vorticity area index to solar magnetic sector structure during the time interval extending from 6 days before to 6 days after the time at which a sector boundary is swept past the earth indicate that a 10% drop in the average value occurs at the time of passage, but this effect is observed only during the winter months.
    Keywords: SOLAR PHYSICS
    Type: Nature; 255; June 12
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  • 5
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    Helioseismic observations at Stanford, 1977-1986 (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Observations of low degree modes of solar oscillations were made at the Wilcox Solar Observatory for more than a decade. The set of observations from 1977 through 1986 are reexamined. The stability of the p-mode frequencies for modes of degree l=2-5 in each year is tested. A marginally significant trend of a decrease in p-mode frequencies of 0.06 microHz per year is found. The continuity of the observed signal at 160.01 minutes are also examined. It was found that the previously reported phase stability is no longer present. However, due to uncertainties in calibration, the reality of the reported signal can not be excluded.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-179933 , NAS 1.26:179933 , CSSA-ASTRO-86-43
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  • 6
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    The solar oscillations investigation: Michelson Doppler imager (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Solar Oscillations Investigation (SOI) developed the Michelson Doppler Imager (MDI) to investigate the properties of the solar interior using the tools of helioseismology and of the photosphere and corona using more conventional techniques. The fundamental goal is to understand the Sun by determining its structure and observing its dynamics. The basic observables, velocity, intensity, and magnetic field, are computed on board from up to twenty 1024 by 1024 filtergrams made each minute. Subsequent analysis will extend the region to be explored downward into the solar interior and upward into the corona. While the instrument is dedicated to producing an uninterrupted series of helioseismology data, several magnetograms will be made each day and special eight hour campaigns are being developed to address specific scientific questions, some in coordination with other SOHO (Solar and Heliospheric Observatory) instruments.
    Keywords: SOLAR PHYSICS
    Type: ESA, Proceedings of the First SOHO Workshop: Coronal Streamers, Coronal Loops, and Coronal and Solar Wind Composition; p 9-12
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  • 7
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    The influence of the heliospheric current sheet and angular separation on flare accelerated solar wind (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A complete set of major flares was used to investigate the effect of the heliospheric current sheet on the magnitude of the flare associated disturbance measured at Earth. It was also found that the angular separation tended to result in a smaller disturbance. Thirdly, it was determined that flares tend to occur near the heliospheric current sheet.
    Keywords: SOLAR PHYSICS
    Type: NASA-CR-175962 , NAS 1.26:175962 , SU-CSSA-ASTRO-85-17
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  • 8
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    Structure of the solar oscillation with period near 160 minutes (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: (Previously announced in STAR as N82-25074)
    Keywords: SOLAR PHYSICS
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  • 9
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    Structure of the heliospheric current sheet in the early portion of sunspot cycle 21 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The structure of the heliospheric current sheet on a spherical source surface of radius 2.35 solar radii has been computed via the use of a potential field model during the first year and a half after the last sunspot minimum. The solar polar magnetic field that is not fully observed in conventional magnetograph scans was included in the computation. The computed heliospheric current sheet had a quasi-stationary structure consisting of two northward and two southward maxima in latitude per solar rotation. The extent in latitude slowly increased from about 15 deg near the start of the interval to about 45 deg near the end. The magnetic field polarity (away from the sun or toward the sun) at the subterrestrial latitude on the source surface agreed with the interplanetary magnetic field polarity observed or inferred at the earth on 82 percent of the days. The interplanetary field structure observed at the earth at this time is finely tuned to the structure of low-latitude fields on the source surface.
    Keywords: SOLAR PHYSICS
    Type: Journal of Geophysical Research; 87; Dec. 1
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  • 10
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    Detection of solar gravity mode oscillations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An analysis of solar velocity data obtained at the Stanford Solar Observatory shows the existence of solar global oscillations in the range 45 to 105 microHz (160 to 370 minutes). These oscillations are interpreted as internal gravity modes of degree l = 1 and l = 2. A good estimate of the order of the modes has also been made. Previously announced in STAR as N84-11086
    Keywords: SOLAR PHYSICS
    Type: Nature (ISSN 0028-0836); 306; 651-653
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