We previously described coronal events that originate in the 2-6Rsolar field of view of the LASCO white-light coronagraph andinvolve the simultaneous ejection of material inward toward the Sun andoutward away from it. Now, in a study of more than 160 in/out pairs, wehave found that these features are density enhancements at the leadingand trailing edges of depletions that occur when slowly rising coronalstructures separate from the Sun. The outward component is shaped like alarge arch with both ends attached to the Sun, and the inward componentis often resolved into loops. We also found about 60 additional eventsin which the outward components began near the edge of the occultingdisk and inward components were not visible, as if these events werein/out pairs that originated below the 2 Rsolar radius of theocculting disk. We conclude that in/out pairs belong to a broad class ofstreamer detachments, which include ``streamer blowout'' coronal massejections, and we suppose that all of these events occur when risingmagnetic loops reconnect to produce an outgoing helical flux rope and aningoing arcade of collapsing loops.
CITATION STYLE
Sheeley, Jr., N. R., & Wang, Y. ‐M. (2007). In/Out Pairs and the Detachment of Coronal Streamers. The Astrophysical Journal, 655(2), 1142–1156. https://doi.org/10.1086/510323
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