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  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The X-ray signature of solar coronal mass ejections (1985)
    Springer
    Solar physics 97 (1985), S. 387-400 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The coronal response to six solar X-ray flares has been investigated. At a time coincident with the projected onset of the white-light coronal mass ejection associated with each flare, there is a small, discrete soft X-ray enhancement. These enhancements (precursors) precede by typically ∼20 m the impulsive phase of the solar flare which is dominant by the time the coronal mass ejection has reached an altitude above 0.5 R ⊙. We identify motions of hot X-ray emitting plasma, during the precursors, which may well be a signature of the mass ejection onsets. Further investigations have also revealed a second class of X-ray coronal transient, during the main phase of the flare. These appear to be associated with magnetic reconnection above post-flare loop systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00165998
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of loop flows observed on 27 March, 1980 by the UVSP instrument during the Solar Maximum Mission (1985)
    Springer
    Solar physics 98 (1985), S. 91-118 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we present the results of an analysis of a set of observations in the C iv 1548 Å line obtained on 27 March, 1980 by the Solar Maximum Mission Ultraviolet Spectrometer and Polarimeter (UVSP). The observed region covers an area of 240 × 240 arc sec and includes a system of bright loops at the limb. Simultaneous spectroheliograms and dopplergrams of the loop region allowed us to derive empirical velocity and emission-measure profiles on individual loops. These have been compared with the theoretical profiles for: (i) a steady-state loop model with siphon flow, (ii) a steady state loop model with downflow in both legs maintained by continuous mass addition near the loop summit, (iii) a non-steady loop model with downflow, whereby the initial plasma density decays exponentially with time (similarity solution). None of these simple models is capable of simultaneously representing both the velocity and emission measure profiles; thus we still lack a realistic description of cool loop dynamics. New observations aimed at determining such parameters as the loop lifetime are considered crucial for providing the necessary constraints for future modeling efforts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00177201
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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