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  • 1
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    Study of the mechanism for solar wind formation (1987)
    In:  CASI
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    Publication Date: 2013-08-31
    Description: Observations of the corona and solar wind are analyzed and compared with generalized results derived from laboratory-scale experiments. It was shown that a thermal pressure gradient can make a major contribution to a precipitating plasma of the solar wind emanating from coronal holes. It is found that the divergence Phi = (R/R sub solar radius)f of the magnetic field lines, originating from coronal holes, is one of the factors governing solar wind velocity at Earth orbit (R= 1 AU). A decrease in the velocity V sub R = 1 AU from approx = 750 mk/sec down to approx = 450 km/sec may be attributable to an increase in superradial divergence f from approx = 7-9 to 20. The plasma energy flux density F at the base of the coronal holes representing the sources of the solar wind with V sub R=1AE = (450 to 750) km/sec, remains nearly constant, being F approx = (1.4 +/- 0.3) x 10 to the 6th power x ergs/sq cm/sec for the period 1973-1975.
    Keywords: SOLAR PHYSICS
    Type: Alabama Univ., Huntsville. STIP Symposium on Physical Interpretation of Solar(Interplanetary and Cometary Intervals; p 55
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    New results on the site of initiation of Cornal Mass Ejections (CMES), and an interpretation of observation of their interaction with streamers (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: In this paper it is shown that in some months of the phase of minimum solar activity 1985-1987 as many as (80-90)% of a total number of CMEs occur near belts of streamers with neutral line (NL), and only (10-20)% of them appear near belts of streamers without NL. (Streamers without NL separate regions in the corona with the same direction of radial fields of magnetic tubes originating from adjacent coronal holes). With increasing solar activity, the center of gravity of the number of emerging CMEs is shifting toward belts of steamers without NL and reaches over 80% of their total number in some months by the end of 1989. The CME position angle (PA) coincides, on average, with the angle of the portion of NL which straddles the CME. It is quite possible that this condition is satisfied not in the average but rigorously for each CME. The streamer observed on the limb does not disrupt if the CME in transit either only slightly overlaps with the streamer or lies at all outside it. If in the limb plane under consideration the steamer lies inside the CME, then it disrupts after CME passage.
    Keywords: Solar Physics
    Type: ; 59
    Format: text
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    NASA TECHNICAL REPORTS
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