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  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Solar and interplanetary observations of the mass ejection on 7 May, 1979 (1988)
    Springer
    Solar physics 115 (1988), S. 327-343 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present observations of a mass ejection that was observed by five different instruments along its way from the solar surface to more than 100 solar radii. The instruments involved are the ground-based Hα coronagraph at Wrocław, the white-light SOLWIND coronagraph on board the P78-1 satellite, zodiacal light photometers of the HELIOS B spacecraft, in situ plasma detectors and magnetometers on board the HELIOS B spacecraft, and interplanetary scintillation measurements on the ground. By using a CAT-scan analysis of the images obtained by the SOLWIND coronagraph near the Earth and HELIOS B photometers placed at 0.3 AU perpendicular to the Earth-Sun line, we have been able to get a three-dimensional density reconstruction of the mass ejection and fit the best velocity curve for its propagation. Although problems exist in smoothly joining the height-time curves (for instance, we had to reduce the brightness of the SOLWIND data by more than a factor of two to make the data sets agree photometrically), both this analysis and direct measurements by the other experiments clearly indicate higher speeds at greater distances from the Sun. The plasma acceleration in this case was obviously not limited only to distances within 3 R 0 , as is usually the case, but continued beyond the outer limit of the coronagraph view at ∼ 8 R 0 .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148732
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Giant solar arches and coronal mass ejections in November 1980 (1989)
    Springer
    Solar physics 122 (1989), S. 131-143 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using data from the SOLWIND coronagraph and photometers aboard HELIOS-A we examine coronal mass ejections from an active region which produced a series of giant post-flare coronal arches. HXIS X-ray observations reveal that in several cases underlying flares did not disrupt these arch structures, but simply revived them, enhancing their temperature, density and brightness. Thus we are curious to know how these quasi-stationary X-ray structures could survive in the corona in spite of recurrent appearances of powerful dynamic flares below them. We have found reliable evidence that two dynamic flares which clearly revived the preexisting giant arch were not associated with any mass ejection. After two other flares, which were associated with mass ejections, the arch might have been newly formed when the ejection was over. In one of these cases, however, the arch had typical characteristics of a revived structure so that it is likely that it survived a powerful mass ejection nearby. In a magnetic configuration of the arch which results from potential-field modelling (Figure 1(b)) such a survival seems possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00162831
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Coronal mass ejection associated with the stationary post-flare arch of 21–22 May 1980 (1986)
    Springer
    Solar physics 103 (1986), S. 399-408 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By using a combination of X-ray (HXIS), Hα (Haleakala), white-light corona (Solwind), and zodiacal light (Helios) images on 21–22 May, 1980 we demonstrate, and try to explain, the co-existence of a coronal mass ejection with a stationary post-flare coronal arch. The mass ejection was seen, both by Solwind and Helios, in prolongation of the path of a powerful spray, whereas the active region filament did not erupt. A tentative comparison is made with other occurrences of stationary, or quasi-stationary post-flare coronal arches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00147838
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A metric type III burst asymmetry relative to simple bipolar active regions (1986)
    Springer
    Solar physics 105 (1986), S. 123-132 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Metric type III solar radio burst positions are compared spatially and temporally to underlying active region geometry. The positions of these radio bursts have an asymmetric location distribution relative to simple bipolar regions. The type III bursts show a tendency to occur nearer the leading active region - an association shown before from type III burst and magnetic field polarity measurements. The type III bursts also generally occur to the left of the outward to inward directed magnetic field. The asymmetry relative to the outward directed magnetic field has a sense that is consistent with a mechanism of type III burst production that involves a pre-existing coronal current system situated between expanding closed and open magnetic field lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00156382
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    Paper (German National Licenses)
    Fulltext
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