Forerunners: Outer rims of solar coronal transients |
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| Authors: | B V Jackson E Hildner |
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| Institution: | (1) High Altitude Observatory, National Center for Atmospheric Research, 80307 Boulder, Colo., U.S.A.;(2) Present address: Division of Radiophysics, CSIRO, Sydney, Australia |
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| Abstract: | The large loop or blob-like transient events viewed in the white-light corona are rimmed by broad regions where the density is slightly enhanced above the pre-transient corona. Every one of the Skylab events studied for which sufficiently good Skylab coronagraph coverage is available shows this effect. The upper boundaries of these  forerunners blend gradually into the background corona 1 to  2R
 above the transients' leading edges. In any single event, the coronal mass enhancement represented by the forerunner comprises up to 25% of the total excess mass present in the coronagraph's field of view and includes a much larger volume of the corona than previously attributed to the underlying transient. We have not yet seen a forerunner without an accompanying transient. Clearly, forerunners must be reckoned with in any proposed models of discrete outward coronal mass motions, because they indicate the presence of disturbed corona far ahead of the denser portions of the event.Skylab Solar Workshop Postdoctoral Appointee 1975–78. The Skylab Solar Workshops are sponsored by NASA and NSF and managed by the High Altitude Observatory.The National Center for Atmospheric Research is sponsored by the National Science Foundation. |
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