Abstract X-ray imaging from Skylab and various sounding rockets has established the existence of and begun the characterization of coronal X-ray bright points (XBPs). With the launch of Yohkoh, the Soft X-ray Telescope (SXT) provides a new opportunity to observe these small-scale structures with higher temporal resolution, improved dynamic range, and greater sensitivity. We present the results from the analysis of SXT full-disk images showing the location and detailed evolution of XBPs. We derive correlations of XBPs with magnetic bipoles, He I 10830-Å dark points, and other coronal features. From the evolution of 518 XBPs presented in this initial study, we derive a mean lifetime of about 12 hours, with some XBPs lasting as long as 5 days and others less than 10 minutes. A comprehensive study of the relationship between XBP lifetime, X-ray output, size, location, and variability may well lead to a re-evaluation of the nature and definition of XBPs.


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    Title :

    Lifetimes and distribution of coronal bright points observed with Yohkoh


    Contributors:
    Harvey, K.L. (author) / Strong, K.T. (author) / Nitta, N. (author) / Tsuneta, S. (author)

    Published in:

    Publication date :

    1993-01-01


    Size :

    4 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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