Lifetimes and distribution of coronal bright points observed with Yohkoh

Details Lifetimes and distribution of coronal bright points observed with Yohkoh Lifetimes and distribution of coronal bright points observed with Yohkoh

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13...27h&link_type=abstract

Advances in Space Research, Volume 13, Issue 9, p. 27-30.

Computer Science

Sound

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Scientific paper

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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